The cost to produce x kilograms of whatchamacallits is given by the function C(x) = 50x + 1000 where Cix) is in hundreds of dollars. The revenue for the sale of x whatchamacallits is given by R(x) = 450x where R(x) is in hundreds of dollars. How many kilograms should be produced and sold to realize a maximum profit? What is that maximum profit?

This solution of g(x) has no real solutions, so g⁻¹ (-7) does not exist.

To find g⁻¹ (-7), we need to solve for x in the equation g(x) = -7.

First, we need to determine which part of the piecewise function to use. Since -7 is less than 5, we know that we need to use the first part of the function: g(x) = 5x² if x ≤ -3.

So, we set g(x) = 5x² equal to -7 and solve for x:

5x² = -7

x² = -7/5

This equation has no real solutions since the square of any real number is always nonnegative. Therefore, g⁻¹ (-7) does not exist in the real numbers.

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Answer:

86 degrees fahrenheit

Step-by-step explanation:

(30°C × 9/5) + 32 = 86°F

The rate of change of a function as x approaches infinity is determined by the leading term in the function.

For f(x) = 2x - 10, the leading term is 2x.

For g(x) = 16x - 4, the leading term is 16x.

For h(x) = 3x^2 - 7x + 8, the leading term is 3x^2.

Since the coefficient of the leading term in h(x) is positive, and it has a higher degree than the leading terms of f(x) and g(x), h(x) has the greatest rate of change as x approaches infinity.

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The 1,000 feet and 200 feet distances of the top and the base of the skyscraper from the point on the ground, indicates, using Pythagorean Theorem that the height of the skyscraper is 400·√6 feet

Pythagorean Theorem states that the square of the length of the hypotenuse side of a right triangle is equivalent to the sum of the squares of the other two sides.

The distance of the top of the skyscraper from a point on the ground = 1000 feet

The distance of the base of the skyscraper from the same point = 200 feet

Therefore, according to the Pythagorean Theorem, in the right triangle formed by the ray from the top of the skyscraper to the point on the ground, the height, h, of the skyscraper, and the distance of the point on the ground from the skyscraper, we get;

1000² = h² + 200²

h² + 200² = 1000²

h² = 1000² - 200² = 960,000

h = √(960,000) = 400·√6

The height of the skyscraper is 400·√6 feet

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The possible outcomes of sample space is 12.

To calculate the total number of outcomes in a sample space, multiply the number of serving options with the number of flavors.

There are 4 flavors that are lime, cherry, blueberry, and  watermelon and 3 serving options that are served plain, mixed with ice cream, or as a drink.

Hence, the possible outcomes will be:

4 x 3 = 12

The outcomes can be represented as lime Italian ice mixed with ice cream, cherry Italian ice served as a drink, Watermelon Italian ice mixed with ice cream, Blueberry Italian ice served plain and likewise.

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The probability of rolling two numbers with a sum less than 7 when rolling two dice simultaneously is 5/12.

From the given table, there are 36 possible outcomes when rolling two dice (6 sides on each die, so 6 x 6 = 36).

Now, let's identify the outcomes where the sum is less than 7:
(1,1) (1,2) (1,3) (1,4) (1,5)
(2,1) (2,2) (2,3) (2,4)
(3,1) (3,2) (3,3)
(4,1) (4,2)
(5,1)

There are 15 outcomes where the sum is less than 7.

To calculate the probability, we can use the formula:
Probability = (Number of desired outcomes) / (Total number of outcomes)

In this case, the probability of rolling two numbers with a sum less than 7 is:
Probability = 15 / 36 = 5 / 12

So, the probability of rolling two numbers with a sum less than 7 is 5/12.

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Answer:

angle g is 98 degrees.

Step-by-step explanation:

assuming the figure is a quadrilateral,

angle g + 82 + 104 + 76 = 360 ( Property of Quadrilateral)

262 + angle g = 360

angle g = 98 degrees

The area of the shaded sector is 461.7 [tex]yd ^ {2}[/tex]

The shaded region in the given question is a sector. So, we will calculate the area of the sector. The area of a sector is nothing but a fraction of the area of the whole circle. So, we will use the given formula to find the area of a sector of the circle.

area of sector = [tex]\frac{angle of sector}{360} * \pi r^{2}[/tex]

We know that the angle of the sector is 167 degrees and the radius of the circle is given to be 17.8 yd. We will substitute these values in the formula to calculate the area.

area of sector =   [tex]\frac{167}{360} * \pi * (17.8)^{2}[/tex]

area of sector = 461.7 [tex]yd^{2}[/tex]

Therefore the area of the shaded region to the nearest tenth is 461.7 square yards.

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The complete question is "Find the area of the shaded sector.

round to the nearest tenth.

167°

17.8 yd

area = [ ? ]yd?

The image is shown below."

Mike will need 28 feet of fencing.

To solve the problem, we can use the formula for the area of a rectangle:

A = L × W

where A is the area, L is the length, and W is the width.

We know that the area of the patio is 192 ft^2, so we can write:

192 = L × W

We also know that the length is 4 feet longer than the width, so we can write:

L = W + 4

Substituting L = W + 4 into the equation for the area, we get:

192 = (W + 4) × W

Expanding the right side of the equation, we get:

192 = W^2 + 4W

Rearranging, we get a quadratic equation in standard form:

W^2 + 4W - 192 = 0

We can solve for W by factoring or using the quadratic formula, but in this case, we can recognize that 12 and -16 are two numbers that multiply to -192 and add up to 4. Therefore, we can write:

W^2 + 4W - 192 = (W + 16) × (W - 12) = 0

This gives us two possible values for W: W = -16 or W = 12. Since the width cannot be negative, we reject the solution W = -16 and choose W = 12.

Using the equation L = W + 4, we find that the length is L = 16.

Finally, we can calculate the amount of fencing Mike will need by adding up the lengths of the three sides that need to be fenced. The two lengths are L = 16 feet each, and the width is W = 12 feet. Therefore, Mike will need a total of 16 + 16 + 12 = 44 feet of fencing. However, since one side of the patio is adjacent to the back of his house, he only needs to fence three sides.

Therefore, he will need 44 - 16 = 28 feet of fencing.

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The expression that denotes the number of slices of pizza eaten by Harris is: (N/4) - 1

The parameters are given as:

Slices of pizza = n

Number of friends = 4

Slices of pizza evenly divided among friends = Total number of slices/number of friends = N/4

Now, this value will represent the number of slices each friend got.

Since, Harris had 1 slice lesser than what he received, then we can say that:

Number of slices of pizza eaten by Harris = (N/4) -1

This is because it's evenly divided into 4 people and as such we divide the total (N) by 4.

Since he at one less, you subtract one.

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Complete question is:

4 friends evenly divided up an n-slice pizza. One of the friends, Harris, ate 1 fewer slice than he received. How many slices of pizza did Harris eat? Write your answer as an expression.

The equation of the circle with a center at (-3, 6) and passing through the point (9, 1) is (x + 3)^2 + (y - 6)^2 = 169.

To write the equation of a circle with a center at the point (-3, 6) and passing through the point (9, 1), we can use the general equation of a circle: (x - h)^2 + (y - k)^2 = r^2, where (h, k) is the center of the circle, and r is the radius.

1. Identify the center (h, k) as (-3, 6).
2. Calculate the radius using the distance formula between the center and the given point (9, 1):
  r = √((x2 - x1)^2 + (y2 - y1)^2)
  r = √((9 - (-3))^2 + (1 - 6)^2)
  r = √((12)^2 + (-5)^2)
  r = √(144 + 25)
  r = √169
  r = 13

3. Substitute the values of h, k, and r into the equation of a circle:
  (x - (-3))^2 + (y - 6)^2 = 13^2
  (x + 3)^2 + (y - 6)^2 = 169

So, the equation of the circle with a center at (-3, 6) and passing through the point (9, 1) is (x + 3)^2 + (y - 6)^2 = 169.

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Answer:

The sum of all numbers divisible by 6 between 100 and 400 is 12450.

Step-by-step explanation:

I think this is correct.

If it isn't, I'm sorry.

If A queen-sized mattress is 20 inches longer than it is wide. A king-sized mattress is 1280 square inches.

In mathematics, a variable is a symbol or letter that represents a value that can change or vary in a given context or problem. The area of the queen-sized mattress is x(x + 20) square inches. The equation to determine the area of the king-sized mattress is (x + 16)(x + 20) = x(x + 20) + 1280

Let x be the width of the queen-sized mattress in inches.

Then the length of the queen-sized mattress is x + 20 inches.

The length of the king-sized mattress is the same as the length of the queen-sized mattress, which is x + 20 inches.

We can use the formula for the area of a rectangle to find the area of each mattress:

Area of queen-sized mattress = length x width = (x + 20) x x = x^2 + 20x

Area of king-sized mattress = length x width = (x + 20) x (x + 16) = x^2 + 36x + 320

Area of king-sized mattress = Area of queen-sized mattress + 1,280

Substituting the expressions we found for the areas, we get:

x^2 + 36x + 320 = x^2 + 20x + 1280

Simplifying and solving for x, we get:

16x = 960

x = 60

So the width of the queen-sized mattress is 60 inches, and its length is 80 inches.

The width of the king-sized mattress is 76 inches, and its length is 80 inches.

The area of the queen-sized mattress is:

60^2 + 20(60) = 4,800 square inches

The area of the king-sized mattress is:

76^2 + 36(76) + 320 = 6,080 square inches

And we can verify that the area of the king-sized mattress is indeed 1,280 square inches more than that of the queen-sized mattress:

6,080 - 4,800 = 1,280

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The majority of logs in the pile will have a weight close to the mean of 17 pounds, with a smaller number of logs having a weight that is farther away from the mean.

In statistics, the normal distribution is a commonly used continuous probability distribution.

It is also referred to as a Gaussian distribution, and it has a bell-shaped curve that is symmetrical around the mean.

The mean is the center of the distribution, and the standard deviation describes how spread out the data is around the mean.

In this case, the weights of logs in a wood pile are normally distributed with a mean of 17 pounds and a standard deviation of 3.4 pounds.

This means that the majority of logs in the pile will have a weight close to the mean of 17 pounds, with a smaller number of logs having a weight that is farther away from the mean.

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Answer:

  20°

Step-by-step explanation:

You want the measure of angle G in triangle GPQ with side lengths GP=74, PQ=31, QG=88 meters.

The law of cosines tells you the relevant relationship is ...

  PQ² = GP² +GQ² -2·GP·GQ·cos(G)

Solving for angle G gives ...

  G = arccos((GP² +GQ² -PQ²)/(2·GP·GQ))

  G = arccos((74² +88² -31²)/(2·74·88)) = arccos(12259/13024)

  G ≈ 19.735° ≈ 20°

The golfer must play the shot within an angle of about 20°.

The shopkeeper sold an average of 40.5 eggs per day during the given interval.

To calculate the average number of eggs sold per day, add up the total number of eggs sold and divide by the number of days.

Total number of eggs sold = 42 + 49 + 61 + 35 + 27 + 36 + 50 + 34 + 31 + 40 = 405

Number of days = 10

Average number of eggs sold per day = 405 / 10 = 40.5

The shopkeeper sold an average of 40.5 eggs per day during the given interval.

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The shopkeeper sold every day the number of eggs is recorded. At equal intervals group 42, 49, 61, 35, 27, 36, 50, 34, 31, 40

What is the average number of eggs sold per day by the shopkeeper over the given interval?

Answer:

(Credit to guy/girl above) 63 miles 10 1/2 x 6 is 63.

Step-by-step explanation:

pls mark brainliest

Angle S,  Angle T and side ST are common to triangle SUT and triangle SVT.

To identify the angle or side that is common to triangle SUT and triangle SVT, based on given information, we can evaluate them as follows:

A. Angle S is common to both triangles SUT and SVT, as it is the vertex where the two triangles share a point.
B. Side SV is not common to both triangles, as it is only a side of triangle SVT.

C. Side ST is common to both triangles SUT and SVT, as it connects the shared vertex S to points U and V in each respective triangle.
D. Angle T is also common to both triangles SUT and SVT, as it is the other vertex where the two triangles share a point.

Therefore,  Angle S, side ST, and Angle T are all common to triangle SUT and triangle SVT.

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Miguel will wait for 6 minutes in line, there are 6 employees working.

Joni will wait 3 minutes to order when 8 employees are working.

Here are the steps to answer your questions:

1. If Miguel waits 6 minutes in line to order, predict the number of employees working:

We have the trend line equation y = -1.5x + 15, where y is the waiting time in minutes, and x is the number of employees. We are given that Miguel waits for 6 minutes, so we'll plug y = 6 into the equation and solve for x:

6 = -1.5x + 15

To solve for x, first subtract 15 from both sides of the equation:

6 - 15 = -1.5x
-9 = -1.5x

Now, divide both sides by -1.5:

x = -9 / -1.5
x = 6

So, when Miguel waits 6 minutes in line, there are 6 employees working.

2. Joni arrives at the restaurant when 8 employees are working. Predict the amount of time Jodi will wait to order:

We'll use the same trend line equation and plug in x = 8 to find the waiting time for Joni:

y = -1.5(8) + 15

Multiply -1.5 by 8:

y = -12 + 15

Now, add 15:

y = 3

Joni will wait 3 minutes to order when 8 employees are working.

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Latoya may experience some fluctuations in her winnings and losses in the short run, in the long run, her average winnings will approach $0.50 per selection.

What is the expected value of playing the game and what Latoya can expect after playing the game many times?

(a) To find the expected value of playing the game, we need to multiply the amount that Latoya can win or lose by the probability of each outcome, and then add up the results. Let p(i) be the probability of selecting the ball with the number i. Since there are 8 balls in total and each ball is equally likely to be selected, we have:

p(i) = 1/8 for i = 1, 2, ..., 8

Now we can calculate the expected value:

E(X) = ∑[i=1 to 5] (i * p(i)) + ∑[i=6 to 8] (-1 * p(i))

= (1/8)(1) + (1/8)(2) + (1/8)(3) + (1/8)(4) + (1/8)(5)

- (1/8)(1) - (1/8)(1) - (1/8)(1)

= 0.5

Therefore, the expected value of playing the game is $0.50.

(b) In the long run, after playing the game many times, Latoya can expect to break even (neither gain nor lose money) on average per selection. This means that over a large number of selections, she can expect to win some money on some selections and lose some money on others, but on average, her total winnings and losses will balance out to zero.

To see why this is the case, consider that the expected value of a single selection is $0.50. If Latoya plays the game many times, the law of large numbers tells us that the average winnings per selection will converge to the expected value of $0.50. So even though Latoya may experience some fluctuations in her winnings and losses in the short run, in the long run, her average winnings will approach $0.50 per selection.

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Using the formula V = k*T/P to get the volume, the required volume in the given situation is 1.77L.

The measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units.

Volume and the notion of length are connected.

The area that any three-dimensional solid occupies is known as its volume.

These solids can take the form of a cube, cuboid, cone, cylinder, or sphere.

So, the volume can be obtained using the equation:

V = k*T/P

The value of the constant k is:

K = PV/T = 16N/cm²*2.2L/340K = 0.104N*L*K⁻¹*cm⁻²

We can now determine the volume when:

T = 408 K

P = 24 N/cm²

V = k*T/P = 0.104N*L*K⁻¹*cm⁻²*408K/21Ncm = 1.77L

Therefore, using the formula V = k*T/P to get the volume, the required volume in the given situation is 1.77L.

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Correct question:

The volume of a gas varies inversely to the pressure and direction of the temperature (in degrees Kelvin). If a certain gas occupies a volume of 2.2 liters at a temperature of 340 K and a pressure of 16 newtons per square centimeter, find the volume when the temperature is 408 K and the pressure is 24 newtons per square centimeter.

The profit is positive, the firm makes a profit of $21,243 at the optimal level of production.

Cost of producing 40 units

We know that the total cost of producing 30 units is $6000. Let's denote the total cost function by C(x), where x is the number of units produced. Then, we have:

C(30) = $6000

The marginal cost function is given as MC = 8x + 70. Integrating this function, we get the total cost function as:

C(x) = [tex]4x^2[/tex] + 70x + C

To find the value of the constant C, we use the fact that C(30) = $6000:

4[tex](30)^2[/tex] + 70(30) + C = $6000

Solving for C, we get:

C = $300

Therefore, the total cost function is:

C(x) = [tex]4x^2[/tex] + 70x + $300

To find the cost of producing 40 units, we evaluate C(40):

C(40) = [tex]4(40)^2[/tex] + 70(40) + $300

C(40) = $7000

Therefore, the cost of producing 40 units is $7000.

Optimal level of production:

The optimal level of production is the value of x that maximizes the profit function. To find this value, we need to set the marginal cost equal to the marginal revenue:

MC = MR

8x + 70 = -6x + 55

Solving for x, we get:

x = 5/7

Since the optimal level of production should be a whole number, we round x up to 1 unit.

Therefore, the optimal level of production is 1 unit.

Profit function:

The profit function is given as:

P(x) = R(x) - C(x)

where R(x) is the revenue function and C(x) is the cost function.

The marginal revenue function is given as MR = -6x + 55. Integrating this function, we get the revenue function as:

R(x) = -[tex]3x^2[/tex] + 55x + D

To find the value of the constant D, we use the fact that the revenue at x = 80 is $14,920:

[tex]-3(80)^2[/tex] + 55(80) + D = $14,920

Solving for D, we get:

D = $21,520

Therefore, the revenue function is:

R(x) = -[tex]3x^2[/tex] + 55x + $21,520

Substituting the cost function and revenue function in the profit function, we get:

P(x) = ([tex]-3x^2[/tex] + 55x + $21,520) - (4x^2 + 25x + $300)

Simplifying, we get:

P(x) = -[tex]7x^2[/tex] + 30x + $21,220

Therefore, the profit function is P(x) = [tex]-7x^2[/tex] + 30x + $21,220.

Profit or loss at the optimal level:

To find the profit or loss at the optimal level, we evaluate the profit function at x = 1:

P(1) = [tex]-7(1)^2[/tex] + 30(1) + $21,220

P(1) = $21,243

Since the profit is positive, the firm makes a profit of $21,243 at the optimal level of production.

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The type 1 error in this scenario would be rejecting the null hypothesis that the mean level of fluoride in children's drinking water is less than 1.2 ppm, when in reality it is true.

The EPA claims that fluoride in children's drinking water should have a mean level of less than 1.2 ppm to reduce the number of dental cavities. A type 1 error occurs when we reject the null hypothesis when it is actually true. In this case, the null hypothesis (H0) would be that the mean fluoride level is less than or equal to 1.2 ppm, and the alternative hypothesis (H1) would be that the mean fluoride level is greater than 1.2 ppm.

A type 1 error would occur if we incorrectly conclude that the mean fluoride level is greater than 1.2 ppm when, in reality, it is less than or equal to 1.2 ppm. This could lead to unnecessary actions being taken to reduce fluoride levels when they are already at an acceptable level.

In other words, falsely concluding that the mean level of fluoride in the water is above 1.2 ppm and therefore causing harm to the children's dental health by not reducing the number of dental cavities.

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To use the Comparison Test, we need to find a series that we know is either always greater than or always less than our given series

. Since cosine values oscillate between -1 and 1, we know that 2 + cos(n) is always greater than or equal to 1. Therefore, we can compare our given series to the series 1/n, which we know is a p-series with p = 1 and is divergent.

Using the Comparison Test, we can say that since 1/n is divergent and 1/n ≤ 2 + cos(n) for all n ≥ 71.1, then the series 2 + cos(n) n 71.1 must also be divergent. Therefore, the series 2 + cos(n) n 71.1 is divergent.
Hi! To determine whether the series Σ(2 + cos(n)), where n ranges from 1 to infinity, is convergent or divergent using the Comparison Test, we need to compare it with another series whose convergence behavior is known.

Consider the series Σ(2), which is a constant series where every term is 2. This series diverges, as its partial sums keep increasing without bound. Since cos(n) is bounded between -1 and 1, we know that for every n, 1 ≤ (2 + cos(n)) ≤ 3.

Now, using the Comparison Test, we can compare Σ(2 + cos(n)) with Σ(2). Since Σ(2) is divergent and 2 + cos(n) is always greater than or equal to 2, we can conclude that the series Σ(2 + cos(n)) is also divergent.

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The number of servings did Pablo make is (B) 26.

Unit conversion is the process of converting a value expressed in one unit of measurement to another unit of measurement that represents the same quantity but is expressed in a different unit.

The given quantities are in different units, so we need to convert them to a common unit to determine the number of servings. For this, we need to convert quarts and gallons to fluid ounces.

Here we have

Pablo mixed 2 1/2 quarts of fruit juice with 1 gallon of seltzer.  

Each serving is 8 fluid ounces

Let's first convert the quantities to the same units.

=> 1 gallon = 4 quarts

Total amount of liquid = 2 1/2 + 4 = 6 1/2 quarts

Now, let's find how many 8-ounce servings are in 6 1/2 quarts:

=> 1 quart = 32 fluid ounces

=> 6 1/2 quarts = 6.5 x 32 = 208 fluid ounces

Given that, 1 serving = 8 fluid ounces

Number of servings = 208/8 = 26

Therefore,

The number of servings did Pablo make is (B) 26.

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Complete Question:

Pablo mixed 2 1 /2 quarts of fruit juice with 1 gallon of seltzer. If each serving is 8 fluid ounces, how many servings did Pablo make?

A: 20    B: 26     C: 32    D: 36

The expression represented by the given number line is f(x) = -k(x+2.5)(x-3) where k > 0.

The expression represented by the given number line can be determined by identifying the values that correspond to the endpoints of each arrow and the direction of the arrow.

Starting from the left endpoint, the arrow goes from -2.5 to -1. This means that the expression is positive between -2.5 and -1. To determine the exact expression, we need to know the interval of the arrow.

The arrow starts at 0 and ends at 3, which means the expression is positive between 0 and 3. Finally, the arrow goes from 3 to -2.5, which means the expression is negative between 3 and -2.5.

Putting all of this information together, we can write the expression as:

f(x) = k(x+2.5)(x-3)

where k is a constant that determines the overall scale of the expression. Since the expression is positive between -2.5 and -1, we know that k must be negative. Since the expression is negative between 3 and -2.5, we know that k must be positive.

Therefore, the expression represented by the given number line is:

f(x) = -k(x+2.5)(x-3) where k > 0.

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It takes approximately 10 hours for the drug concentration to decrease.

We can use exponential decay to model the concentration of the drug in the bloodstream. Let C(t) be the concentration of the drug in milligrams at time t in hours since the person took the drug. Then we have:

[tex]C(t) = 125(0.7)^t[/tex]

where 0.7 is the factor by which the concentration decreases each hour.

We want to find the time t such that C(t) = 1. Substituting this into the equation above, we get:

[tex]1 = 125(0.7)^t[/tex]

Dividing both sides by 125, we get:

[tex]0.008 = (0.7)^t[/tex]

Taking the logarithm of both sides with base 0.7, we get:

[tex]t = log(0.008) / log(0.7)[/tex]

Using a calculator, we can evaluate this expression to get:

t ≈ 10.07

Therefore, it will take approximately 10.07 hours for the concentration of the drug in the bloodstream to be 1 milligram.

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The arc length of the polar curve [tex]r = e^{8\theta}[/tex] from θ = 0 to θ = 5 is[tex]\int_0^5 \sqrt{(64e^{16\theta}+1)} d\theta[/tex].

To find the arc length of a polar curve, we use the formula:

L = [tex]\int_a^b \sqrt{[r(\theta)^2+(dr(\theta)/d\theta)^2]} d\theta[/tex]

where r(θ) is the equation of the polar curve, and a and b are the starting and ending values of θ, respectively.

In this case, the equation of the polar curve is[tex]r = e^{8\theta}[/tex], so we have [tex]r(\theta) = e^{8\theta}[/tex]}. To find dr(θ)/dθ, we use the chain rule of differentiation:

dr(θ)/dθ = d/dθ ([tex]e^{8\theta}[/tex]) = [tex]8e^{8\theta}[/tex]

So now we have r(θ) and dr(θ)/dθ, which we can plug into the formula for arc length:

L = [tex]\int_0^5 \sqrt{[e^{16\theta}+(8e^{8\theta})^2] }[/tex]dθ

Simplifying the expression inside the square root, we get:

L = [tex]\int_0^5 \sqrt{(64e^{16\theta}+1) }[/tex]dθ

Unfortunately, this integral cannot be evaluated in terms of elementary functions, so we leave the answer in this form. We can, however, approximate it using Simpson's method and it comes out to be approximately 1.3526 * 10⁸.

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Answer:

28 degrees and 62 degrees

Step-by-step explanation:

Set up your equation like this:

x+(x-34)=90

2x-34=90

2x=56

x=28

28+34=62

So the smaller angle is 28 degrees and the larger angle is 62 degrees.

Hope this helps!! :D

The approximate length of the crust when x = 1.2 is 17.28 centimeters. The correct option is D.

To find the total perimeter of Sydney's sandwich, we need to add up the lengths of all four sides. From the given dimensions, we can see that the top and bottom sides each have a length of 2x²8, and the right and left sides each have a length of 2x²9. Therefore, the total perimeter can be expressed as:

2(2x²8) + 2(2x²9)

Simplifying this expression gives:

4x²8 + 4x²9

And further simplifying by factoring out 4x² gives:

4x²(8 + 9)

Which equals:

4x²17

Now, to find the approximate length of the crust when x = 1.2, we simply plug in this value for x into the expression we just found:

4(1.2)²17

Simplifying this expression gives:

4(1.44)17

Which equals:

5.76 + 11.52 = 17.28

Therefore, the approximate length of the crust when x = 1.2 is 17.28 centimeters. The answer is option D, which is 4x²17; 22.76 centimeters.

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