CALC
PLEASE HELP!!

A chemical substance has a decay rate of 8.8% per day. The rate of change of an
dN
amount N of the chemical after t days is given by = -0.088N
dt
(i) Let No represent the amount of the substance present at to. Find the exponential function
that models the decay.
(ii) Suppose that 400g of the substance is present at to. How much will remain after 3 days?
(iii) What is the rate of change of the amount of the substance after 3 days?
(iv) After how many days will half of the original 400 g of the substance remain?

Therefore, sets (2), (3), and (4) can be used to build a triangle, while set (1) cannot.

Any two sides must add up to more than the third side's length in order to form a triangle. Let's use this principle to compare each pair of side lengths:

5 + 3 = 8 + 10 cm, 3 cm, and 5 cm.

3 + 10 = 13 > 5

5 + 10 = 15 > 3

As the total of the lengths of the two shorter sides is not larger than the length of the longest side, a triangle cannot be constructed with this set of side lengths.

3 measurements: 4 cm, 12 cm, and 9 cm 4 + 12 = 16 > 9 4 + 9 = 13 > 12\s12 + 9 = 21 > 4

Given that the total of any two sides is more than the length of the third side, a triangle can be constructed using this set of side lengths.

3, 2, and 5 centimetres

5 + 2 = 7 > 4

2 + 4 = 6 > 5

5 + 4 = 9 > 2

Given that the total of any two sides is more than the length of the third side, a triangle can be constructed using this set of side lengths.

3, 5, and 8 centimetres

3 + 5 = 8 > 8

3 + 8 = 11 > 5

5 + 8 = 13 > 3

Due to the fact that the sum of any two side lengths is bigger, a triangle can be constructed with this combination of side lengths.

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The mean of the sampling distribution is 606060 and the standard deviation is 871.78.

As long as the sample size is sufficient (usually, n 30), the central limit theorem implies that if we repeatedly take random samples from a population, the sampling distribution of the sample means will resemble a normal distribution, regardless of the form of the population distribution. This indicates that given the sample mean and standard deviation, we may utilise the normal distribution to draw conclusions about the population mean. Because it enables us to estimate population parameters even when we don't know the population distribution, the central limit theorem is significant.

Given that,

n = 757575

p = 80% = 0.8

q = 1 - 0.8 = 0.2

The mean of the binomial distribution is given as:

Mean: μ = np = (757575)(0.8) = 606060

The standard deviation of the binomial distribution is given as:

σ = √(npq) = √((757575)(0.8)(0.2)) = 871.78

Hence, the mean of the sampling distribution is 606060 and the standard deviation is 871.78.

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Answer:

Below

Step-by-step explanation:

Area = w X l     =   1/2  yd  X  7/6  yd   =   (1*7) / (2*6) =   7/12 yd^2

Answer:

7/12 sq yd

Step-by-step explanation:

The area of a rectangle (which includes a rug) is given by the formula:

Area = Length x Width

We are given that the rug is 1/2 yard wide and 7/6 yards long. So, we can substitute these values into the formula:

Area = (7/6) x (1/2)

To multiply these fractions, we need to find a common denominator. The least common multiple of 6 and 2 is 6, so we can convert both fractions to have a denominator of 6:

Area = (7/6) x (1/2) = (7/6) x (3/3) x (1/2) = 21/36

We can simplify this fraction by dividing the numerator and denominator by their greatest common factor, which is 3:

Area = 21/36 = (21 ÷ 3) / (36 ÷ 3) = 7/12

Therefore, the area of the rug is 7/12 square yards.

Answer:

Elizabeth

Step-by-step explanation:

Her answer shows the ratio of 6:24- lemonade to punch.

Answer: the second one

Step-by-step explanation:

0.2; for each additional day after the kitten is born, its weight is predicted to increase by 0.2 ounces.

Answer: 1015

Step-by-step explanation: We will find the factors of all the given numbers by using the prime factorization method. Then we will multiply the factors with the highest degree to find the least common multiple of the given numbers.

The quadratic function represented by the table is f(x) = -x² + 4x -1.

A polynomial of degree two in one or more variables is referred to as a quadratic polynomial. The polynomial function that a quadratic polynomial defines is known as a quadratic function.

Here, we have

Given: we have three variables a, b, and c, we can solve this problem by taking three points, say:

(0,-1), (2,3), and (4,-1)

Since we know that the function of the table is a quadratic function, we can start writing this function as follows:

f(x) = ax² + bx + c

So these points must satisfy the equation of the function.

For, (0,-1)

-1 = a(0)² + b(0) + c

c = -1

For, (2,3)

3 = a(2)² + b(2) + c

3 = 4a + 2b -1

4 = 4a + 2b

2 = 2a + b....(1)

For,  (4,-1)

-1 = a(4)² + b(4) + c

-1 = 16a + 4b - 1

4a + b = 0...(2)

Now, we have two equations to solve for a and b:

a = -1

b = 4

Now we put the value of a, b, and c in the given equation and we get

f(x) =  (-1)x² + 4x + (-1)

f(x) = -x² + 4x -1

Hence, the quadratic function represented by the table is f(x) = -x² + 4x -1.

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The total cost for the customer for the entire year is  $48,600.

The customer wants to purchase 20 subscriptions for each of their 20 employees, so they need a total of 20 x 20 = 400 subscriptions.

Each subscription costs $10 per month for a yearly commitment,

so the cost for one subscription for a year would be $10 x 12 = $120.

Therefore, the total cost for 400 subscriptions for a year would be $120 x 400 = $48,000.

In addition, they need 1 extra subscription for a different service for every two employees, so they need 20 / 2 = 10 extra subscriptions.

Each extra subscription costs $5 per month for a yearly commitment, so the cost for one extra subscription for a year would be $5 x 12 = $60.

Therefore, the total cost for 10 extra subscriptions for a year would be $60 x 10 = $600.

Adding the cost of the extra subscriptions to the cost of the regular subscriptions, the total cost for the customer for the entire year would be $48,000 + $600 = $48,600.

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For two similar rectangle value of x is,

⇒ x = 4.2 cm

A rectangle is a two dimension figure with 4 sides, 4 corners and 4 right angles. The opposite sides of the rectangle are equal and parallel to each other.

Given that;

There’s two rectangular that are similar and one is 6cm and 2.8 cm.

Now, By using definition of proportion;

The proportion of there corresponding sides are equal.

Hence, We get;

⇒ 6/2.8 = 9/x

Solve for x;

⇒ x = 9 × 2.8 / 6

⇒ x = 4.2 cm

Therefore, For two similar rectangle value of x is,

⇒ x = 4.2 cm

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Thus, the separation between the two locations is roughly 9.1 units, rounded to the closest 10.

Considering that the hypotenuse is the side that faces the right angle, any right triangle has a works great to the sum of the surfaces of the squares that actually make up its two legs.

According to the Pythagorean Theorem, the square of the hypotenuse, the longest side of a right triangle, is equivalent to the total of the cubes of the other two sides. This theory can be used to determine the separation between the two coordinates (0, -4) and (1, 5), as shown below:

The two locations are separated horizontally by one unit.

The vertical distance between the two points is 5 - (-4) = 9 units.

distance = √((1)² + (9)²)

distance = √(82)

distance ≈ 9.06

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The monthly payment for a 30-year mortgage in this scenario is $1,713.78.

What are Percentages?

Percentages are a way of expressing a proportion or ratio in terms of a fraction of 100.

To solve this problem, we can use the formula for calculating the monthly payment for a mortgage:

[tex]M = P[r(1+r)^n/((1+r)^n)-1][/tex]

where M is the monthly payment, P is the principal (the amount borrowed), r is the monthly interest rate, and n is the number of monthly payments (the term of the loan in months).

First, we need to calculate the down payment, which is 10% of the purchase price:

Down payment = 0.1 x $340,000 = $34,000

The principal is the purchase price minus the down payment:

Principal = $340,000 - $34,000 = $306,000

Next, we need to calculate the monthly interest rate. The annual interest rate is 5.3%, so the monthly interest rate is:

r = 0.053/12 = 0.00441667

Finally, we need to calculate the number of monthly payments. A 30-year mortgage has 360 monthly payments (30 years x 12 months per year).

n = 360

Now we can plug in these values into the formula and solve for M:

[tex]M = \$306,000[0.00441667(1+0.00441667)^360/((1+0.00441667)^360)-1][/tex]

M = $1,713.78

Therefore, the monthly payment for a 30-year mortgage in this scenario is $1,713.78.

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Answer:

Julius: 52

John: 47

Grace: 51

Step-by-step explanation:

Let marks scored by Julius, John and Grace be x, y and z respectively

From the information given,
"Julius scored 5 more marks " →   x = y + 5  (1)

"who in turn scored 4 marks less than Grace" →  y = z - 4  (2)

Substitute y =  z - 4 in equation x = y + 5

→  x = (z-4) + 5

→ x = z - 4 + 5

→ x = z + 1

"The total mark scored by the three students was 150":
x + y + z = 150      (3)

Substitute x = z - 1 and y = z - 4 in equation (3):

←  (z + 1) + (z - 4) + z = 150
→  z -+ 1 + z - 4 + z = 150

→  z + z + z +  1 -  4 = 150
→  3z - 3 = 150

→  3z = 150 + 3 = 153

→ z = 153/3 = 51
So Grace's mark was 51

John's mark y = z - 4 = 51 - 4 = 47

Julius' mark x = y + 5 = 47 + 5 = 52

Substitute for y from (2) in (4):
2(z - 4) + z = 145

2z - 8 = 145

The value of the k is 5

The slope of a line is a measure of its steepness or inclination. It tells us how much the line rises or falls as we move horizontally along it.

Parallel lines will have the same slope. That means if two lines are parallel, they have the same steepness or inclination.

Here we have

Equation of the line is y = 3x --- (1)

Equation(1) is in the form y = mx + x

The slope of the line (1) = 3

Let y = m₁x + c is the line that is parallel to line (1)  

Since the slope of the parallel lines are equal

=> y = 3x + c --- (2)

Given that the line passes through (7, 1)

=> 1 = 3(7) + c

=> c = - 21 + 1

=> c = - 20  

Hence, the equation of the line is y = 3x - 20 --- (3)

It is given that the line will also pass through the point (k, 7)

=> 7 = 3k - 20

=> 3k = 27    

=> k = 9

Therefore,

The value of the k is 9

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Answer:

Step-by-step explanation:

yes this relationship is pporportianal

Pοints (1, 9) and (10, 1) wοuld be a line οf fit.

A scatter plοt is a graph that displays values fοr twο variables as οrdered pairs οf data pοints, with οne variable οn the hοrizοntal axis (x-axis) and the οther variable οn the vertical axis (y-axis).

Tο determine which twο pοints a line οf fit wοuld gο thrοugh tο best fit the data in a scatter plοt, we need tο lοοk fοr the pοints that are clοsest tο the general trend οr directiοn οf the pοints. In this scatter plοt, it appears that the general trend is a dοwnward slοping line.

The twο pοints that wοuld best fit this trend are (1, 9) and (10, 1), which are lοcated at the twο ends οf the scatter plοt and appear tο be the farthest frοm the general trend. Therefοre, the answer is:

(1, 9) and (10, 1)

Hence, pοints (1, 9) and (10, 1) wοuld be a line οf fit.

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The new total after the 13% discount has been applied to a bill of £39 is £33.93.

percentage, a relative value indicating hundredth parts of any quantity.

To calculate the new total after the discount, we need to first find the amount of discount applied to the original bill.

We can do this by multiplying the original bill by the discount rate (as a decimal):

Discount = 0.13 * £39 = £5.07

Therefore, the amount of the discount is £5.07.

To find the new total, we need to subtract the discount from the original bill:

New total = £39 - £5.07 = £33.93

Therefore, the new total after the 13% discount has been applied to a bill of £39 is £33.93.

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Answer: We can start by using the formula for calculating commission:

Commission = Rate x Sales

where Rate is the commission rate and Sales is the amount of sales.

In this case, we know the commission earned ($4008) and the commission rate (6%), but we don't know the amount of sales. We can set up an equation and solve for Sales:

$4008 = 0.06 x Sales

Dividing both sides by 0.06, we get:

Sales = $4008 ÷ 0.06 = $66,800

Therefore, the salesperson sold $66,800 worth of video equipment.

Step-by-step explanation:

The average speed for the second part of the journey is 100 kilometer per hour.

Average Speed is the ratio of the total distance travelled to the total time taken to travel the distance.

Given that,

Distance travelled by motorist in first part = 90 km

Time taken to travel the distance = 1 1/2 hour = 1.5 hours

Distance travelled in second part of the journey = 50 km

Time taken to travel the distance = 1/2 hour = 0.5 hour

Average speed = Distance / Time

                          = 50 / (1/2)

                          = 100 km/h

Hence the average speed is 100 kilometer per hour.

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Mrs. Tempio can squirt 4 times as far as Zacarias can, therefore if Zacarias can only squirt 20 metres, Mrs. Tempio can squirt 4 * 20 = 80 metres.

Let's break down the issue to see why. We are aware of Zacarias' 20-meter squirt distance as well as Mrs. Tempio's 4-times-greater squirt distance. Thus, if we write up the following equation and assume that x is the that Mrs. Tempio may squirt:

x = 4 * 20

When we simplify this equation, we obtain:

x = 80

Mrs. Tempio can squirt 80 metres as a result.

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Answer:

58

Step-by-step explanation:

9x + 22                        x = 4

9(4) + 22

36 + 22

58

Step-by-step explanation:

1 blue square on drawing is length 1/4 in but that means 4ft in reality.

so one blue square area correspongs to 4x4 = 16 square feet.

(a) there 6 tiles for the batrhroom = 6x16 sq.ft = 96 sq.ft and the cost will be $480

(b) bedroom + living area = 7x8-8 tiles = 48 tiles = 48 x 16 sq.ft. = 768 sq.ft = 85.33 sq. yards. So the cost will be 85.33*18=$1535.94

(c) unit cost for tile: $5/sq.ft

unit cost for carpet: $1535.94/768sq.ft = $2/sq.ft

The tile has a greater unit cost ($5 per sq.ft) than carpet ($2 per sq.ft)

Tiling the bathroom would cost $25. The price of five squares of tile, or the cost of tiling the bathroom, is: $5 x 5 squares is $25.

a. To calculate the cost of tiling the bathroom, we must first calculate its square footage. Assume the restroom measures 8 feet by 10 feet. We now have the area of:

960 square inches are equal to 8 feet by 12 inches per foot and 10 feet by 12 inches per foot.

The area of the bathroom can be divided by the area of each square, which is 14 inches on the blueprint, to determine the number of squares required:

14 inches by 14 inches divided by 960 square inches equals 4.96 squares.

As we are unable to purchase a fractional quantity of tile, we will round up to 5 squares.

The price of five squares of tile, or the cost of tiling the bathroom, is:

$5 x 5 squares is $25.

Consequently, tiling the bathroom would cost $25.

b. To calculate the cost of carpeting the bedroom and living room, we must first calculate the square footage of each space. Assume that the living room is 18 feet by 20 feet and the bedroom is 12 feet by 14 feet in size. These areas include:

Bedroom: 168 square feet (12 feet by 14 feet).

The living room is 360 square feet (18 feet by 20 feet).

Divide by 9 to convert square feet to square yards:

Bedroom 168 sq ft / 9 sq ft = 18.67 sq ft

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Using compound interest, each payment should be $948.86, rounded to two decimal places.

The interest on savings that is computed on both the initial principal and the interest accrued over time is known as compound interest. Compound interest is computed by multiplying the starting principal amount by one and the annual interest rate raised to the number of compound periods minus one. The final step is to deduct the initial loan principal from the calculated value.

When the amount compounds quarterly, it means that the amount compounds 4 times in a year. i.e., n = 4. We use this fact to derive the quarterly compound interest formula. Thus, the quarterly compound interest formula is:

[tex]A = P (1 + r/4)^t[/tex]

To determine the size of each payment that needs to be made at the end of every 2 months, we can use the formula for the future value of an annuity:

[tex]FV = Pmt x [(1 + r)^{n - 1}] / r[/tex]

When we enter these values into the formula, we obtain:

In this instance, we know that the sinking fund's future value should be $61,000, the interest rate each 2-month period is 5.9%/6 = 0.983%, and there are a total of 54 periods (9 years x 12 months/year / 2 months/period = 54 periods) in the sinking fund's life.

[tex]$61,000 = Pmt x [(1 + 0.00983)^{54 - 1}] / 0.00983[/tex]

Solving for Pmt, we get:

[tex]Pmt = $61,000 x 0.00983 / [(1 + 0.00983)^{54 - 1}][/tex]

= $61,000 x 0.00983 / 0.6346

= $948.86

Therefore, each payment should be $948.86, rounded to two decimal places.

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The correct answer is:

Major Axis Endpoints: (6, -3) and (-2, -3)

Minor Axis Endpoints: (2, 3) and (2, -9).

The major axis of a graph is the line that divides it in two equal parts. It is also known as the x-axis or the y-axis and it is the axis that is perpendicular to both the x and y axes. The major axis is an important part of the graph because it is used to plot the points on the graph. The points on the graph are plotted in relation to the major axis, allowing for easier interpretation of the graph.

The endpoints of the major axis of an ellipse are the points on the ellipse which are farthest away from each other. These points are located on the longest diameter of the ellipse and are the points at which the ellipse changes directions. Similarly, the endpoints of the minor axis of an ellipse are the points on the ellipse which are closest to each other.

In the equation (x−2)212+(y+3)236=1, the equation describes an ellipse which has its center located at the point (2, -3). The major axis of this ellipse has endpoints located at the points (6, -3) and (-2, -3). The minor axis of this ellipse has endpoints located at the points (2, 3) and (2, -9). Therefore, the correct answer for the table is as follows:

Major Axis Endpoints: (6, -3) and (-2, -3)

Minor Axis Endpoints: (2, 3) and (2, -9)

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The formula for calculating the circumference of a circle (the distance around the circle) is:

C = πd, Where C denotes circumference, d denotes diameter and is a mathematical constant equal to 3.14.

Because the diameter of the bicycle wheel, in this case, is 20 inches, the circumference is:

C = d = 20 inches equals 62.8 inches

Darian covers the following distance per second at 3.5 revolutions per second:

62.8 inches = 220.4 inches distance = 3.5 C = 3.5

To convert this to miles per hour, we need to convert inches per second to miles per hour. Because there are 60 seconds in a minute and 60 minutes in an hour, the following are possible:

An hour has 60 X 60 = 3600 seconds.

There are also 12 inches in a foot and 5280 feet in a mile, so there are:

12 × 5280 = 63360 inches in a mile

Therefore, to convert inches per second to miles per hour, we can use the following conversion factor:

1 inch per second = (3600/63360) miles per hour

Multiplying both sides by the distance in inches per second gives:

distance in miles per hour = (distance in inches per second) × (3600/63360)

Plugging in the values we have calculated, we get:

distance in miles per hour = 220.4 inches per second × (3600/63360)

distance in miles per hour = 12.6 miles per hour (approximately)

Therefore, the approximate linear speed of Darian's bicycle tire is 12.6 miles per hour.

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The number that Drew wrote is 790,800.

Number is a mathematical object used to count, measure, and label. It is an abstract concept that can be represented with symbols, such as numerals, and words, such as "three" or "three hundred." Numbers can be used to represent quantities, distances, sizes, and other measurements. In mathematics, number theory is the study of the properties of numbers, such as addition, subtraction, multiplication, and division. Number theory is also used in other sciences, such as physics and computer science.

This is determined by taking the value of each digit and multiplying it by the exponential value that Drew described. The first digit has a value of 7 x 100,000, the second digit has a value of 9 x 100, and the third digit has a value of 8 x 0.01. Therefore, the number is 790,800.

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The number of large pieces of fabric that Lola should buy to be able to make 7 scarves is 7 larger pieces of fabric.

The number of small fabrics needed for one scarf is 8 pieces. The area of these pieces is:

= 8 pieces x ( 1 / 4 x 1 / 4 )

= 0. 5 foot ²

This means that 1 scarf needs 0. 5 foot ² of fabric.

The area of a single large piece of fabric is :

= 1 / 4 x 2

= 0. 5 foot ²

This means that 1 large piece can make 1 scarf. If 7 scarves need to be made therefore, then Lola needs 7 large pieces.

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The correct answer is option D maximum occurs at the function's y-intercept.

A quadratic function's graph is a parabola, which, depending on the sign of the coefficient a, might expand upward or downward. A quadratic function's primary traits are:

The greatest or minimum point of the function is at the parabola's vertex.

The vertex serves as the point on the vertical axis of symmetry.

The function's value at x = 0 is known as the y-intercept.

The x-intercepts of the parabola, which appear where the function equals 0, are the roots or zeros of the function.

We must examine the layout of the quadratic function g's graph, which is depicted in the table, in order to ascertain its properties. The chart shows that the parabola's vertex, or maximum/minimum point, is at:

x = -2, where g(-2) = -16.

The y-intercept also happens to be at g(0) = 4.

Hence, the correct answer is option D maximum occurs at the function's y-intercept.

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The surface area of the larger prism is 24b + (5/2)(bc + bd + cd) + 5/2.

Surface area is the sum of the areas of all the faces (or surfaces) of a three-dimensional object. It is a measure of how much area the surfaces of an object take up in two dimensions. The surface area of a solid can be found by adding up the areas of its faces.

Let's call the other dimensions of the blocks "a", "b", "c", and "d", with "a" and "c" being the lengths, and "b" and "d" being the widths. Then, we have:

Block 1: a x b x c = 15

Block 2: a x b x d = 15

When we join the blocks together, we get a larger rectangular prism with dimensions 12 x b x (c + d). The surface area of this prism can be found by adding up the areas of its six faces:

Surface area = 2(12b) + 2(bc + bd + cd)

Surface area = 24b + 2(15 + bc + bd + cd)/12

Surface area = 24b + (5/2)(bc + bd + cd) + 5/2

Therefore, the surface area of the larger rectangular prism is given by:

Surface area = 24b + (5/2)(bc + bd + cd) + 5/2

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Note:  This question is incomplete so i have given generalized answer