eighteen more than 7 times a number is -12

The score with 6 wrong answers is 88, and with x is modeled by the function:

S(x) = 100 - 2x

We know that the test has a total of 100 points avaible, such that each question is whort 2 points.

So, if she answers 6 questions wrong, she will get a total of 100 points minus 6 times 2 points, this gives:

100 - 6*2 = 100 - 12 = 88 points.

Now, similarly, if she gets x questions wrong, the total score will be 100 minus 2 times x, then we define the linear function:

S(x) = 100 - 2x

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Answer:

x = 20

Step-by-step explanation:

If an altitude is drawn to the hypotenuse of a right triangle, then the altitude is the geometric mean between the segments on the hypotenuse.

[tex] \frac{10}{x} = \frac{x}{40} [/tex]

[tex] {x}^{2} = 400[/tex]

[tex]x = 20[/tex]

Answer:

[tex]\frac{10}{x} =\frac{x}{40} \\\\x=20[/tex]

Step-by-step explanation:

Answer:

18.84

Step-by-step explanation:

:)

Answer:  SORRY THIS TOOK FOREVER ITS SO HARD- THE ANSWER IS F, C, D, H, E, A, G, B!!!

Step-by-step explanation:

THE LEAST TO GREATEST ARE F, C, D, H, E, A, G, B! HOPE IT HELPED!! :D

the area of a square is always the square of its side length, and if the area cannot be expressed as the square of an integer, then we can say that it is not the power of 2.

A square is a quadrilateral that has four equal sides and four right angles. The area of a square is the product of its length and width, which are equal in the case of a square. So, the formula for the area of a square is:

Area = side × side

or

Area = side²

In other words, the area of a square is the square of its side length.

Now, when we say that the area of a square is "not the power of 2," it means that the area cannot be expressed as a perfect square of an integer. For example, if the area of a square is 25, then it is the square of 5, which is an integer, and so the area is the power of 2.

However, if the area of a square is, say, 12, then it cannot be expressed as the square of an integer, since the square of any integer is always a whole number. Therefore, we can say that the area of the given square is not the power of 2.

In summary, the area of a square is always the square of its side length, and if the area cannot be expressed as the square of an integer, then we can say that it is not the power of 2.

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The modular inverse of 11, modulo 1000 is 901. Expressing the answer in integer form.

To find the modular inverse of 11  modulo 1000, we need to find an integer x such that [tex]$11x\equiv1\pmod{1000}$[/tex].

One way to find the modular inverse is to use the extended Euclidean algorithm. Using this algorithm, we can find the greatest common divisor of 11 and 1000 and express it as a linear combination of 11 and 1000.

We can then use the coefficients of this linear combination to express 1 as a linear combination of 11 and 1000.

Applying the extended Euclidean algorithm, we have:

1000= 11 *90 + 10

11 = 10 *1 + 1

Working backward, we can express 1 as a linear combination of 11 and 1000:

1 =11 - 10* 1

= 11 - (1000 - 11*90)

= 901 * 11 - 1 *1000

Therefore, the modular inverse of 11 modulo 1000 is 901, since

11*901=1 mod{1000}.

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Answer: 7.62

Step-by-step explanation:

Answer:

350 centimeters

Step-by-step explanation:

1.5 meters x 3 = 3.5 meters

There are 100 centimeters in one meter

So, 3.5 x 100 = 350

Answer:

3.38

Step-by-step explanation:

Set the equation given equal to 0 and solve for x, this will give you the distance the ball travels. Use the absolute value of the 80 to be able to get a positive number, because time is a positive number.

[tex]0=7x^2+80\\7x^2=-80\\x=\sqrt{\frac{80}{7}\\\\x=3.38062[/tex]

Quadratic Fοrmula: This fοrmula is used tο find the rοοts οf a quadratic equatiοn. It is calculated as:

[tex]$ \rm x = \frac{(-b \pm \sqrt{(b^2 - 4ac)}}{ 2a}[/tex]

it's a secοnd-degree quadratic equatiοn which is an algebraic equatiοn in x. Ax² + bx + c = 0, where a and b are the cοefficients, x is the variable, and c is the cοnstant term, is the quadratic equatiοn in its standard fοrm.

1. Simple Interest Fοrmula: This fοrmula is used tο calculate the interest earned οr paid οn a lοan οr investment. It is calculated as:

[tex]\rm I = P \times r \times t[/tex]

Where I is the interest earned οr paid, P is the principal amοunt, r is the interest rate, and t is the time periοd.

2. Pythagοrean Theοrem: This fοrmula is used tο calculate the length οf οne side οf a right triangle given the lengths οf the οther twο sides. It is calculated as:

[tex]\rm a^2 + b^2 = c^2[/tex]

Where a and b are the lengths οf the twο legs οf the right triangle, and c is the length οf the hypοtenuse.

3. Quadratic Fοrmula: This fοrmula is used tο find the rοοts οf a quadratic equatiοn. It is calculated as:

[tex]$ \rm x = \frac{(-b \pm \sqrt{(b^2 - 4ac)}}{ 2a}[/tex]

Where a, b, and c are cοefficients οf the quadratic equatiοn ax² + bx + c = 0, and x is the sοlutiοn.

4. Bοdy Mass Index (BMI) Fοrmula: This fοrmula is used tο calculate a persοn's bοdy mass index, which is a measure οf bοdy fat based οn height and weight. It is calculated as:

BMI = (weight in kilοgrams) / (height in meters)²

A BMI οf 18.5 tο 24.9 is cοnsidered healthy, while a BMI οf 25 tο 29.9 is cοnsidered οverweight, and a BMI οf 30 οr higher is cοnsidered οbese.

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Complete question:

Describe some common or unique mathematical formulas that you use in your life.

Answer:

See below!

Step-by-step explanation:

a) 1, 2, 3, 4, 5

The possible outcomes are all the options that there are on the spinner

b) 2

There are only 2 even numbers!

c) [tex]\frac{2}{5}[/tex] or 0.4

There are 2 out of 5 numbers are even on the spinner so that must be the solution!

d) 1

The spinner has only one multiple of 3, so the possible outcome should also be 1.

e) [tex]\frac{1}{5}[/tex] or 0.2

There are only 1 out of 5 options which are multiples of 3, so that would be our solution

f) 4

There are 4 prime numbers in the spinner (1, 2, 3, 5), so that would be a possible outcome.

g) [tex]\frac{4}{5}[/tex] or 0.8

The spinner has 4 out of 5 prime numbers, so our answer would be that!

Hope this helps, have a lovely day! :)

Answer:

11

Step-by-step explanation:

add up the exponents

3+1+1+4+2=11

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The total students who are going on the field trip are 320 students out of 400 students which has been obtained by using the concept of fractions.

A fraction represents a part of a number or any number of equal parts. There is a fraction, containing numerator(upper value) and denominator(lower value).

If 4 out of 5 students are going on the field trip, then the fraction of students going on the field trip is 4/5.

To find out how many students are going on the field trip, we can multiply this fraction by the total number of students:

Number of students going on the field trip = (4/5) x 400

Number of students going on the field trip = 320

Therefore, 320 students are going on the field trip.

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Answer:

1.75a + 8b

Step-by-step explanation:

0.75a + 10b + a - 2b ← collect like terms

= (0.75 + 1a) + (10b - 2b)

= 1.75a + 8b

Answer:

1.75a+8b

Step-by-step explanation:

Given here, 0.75a + 10b + a – 2b = 0.75a+a+10b-2b

                                                     =1.75a+8b

Hence, The required equivalent expression is 1.75a+8b

The probability of John waiting is

0.333.

The probability that it takes John between 9 and 12 minutes to wait in line at the bank is 0.333.

This is because the continuous and uniformly distributed time between 7 and 17 minutes is divided into 10 minutes, meaning each unit is equal to 0.1. Therefore,

the probability of John waiting between 9 and 12 minutes is 3 units of 0.1 which is 0.333.

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The rate of change of the base of the triangle is (20 - 1/12 × base × b) cm/min when the altitude is h cm and the area is a sq cm. And this is solved by the concept of Differentiation.

The problem asks to find the rate of change of the base of a triangle when the altitude and area of the triangle are given.

Let's use the formula for the area of a triangle, which is A = 1/2 × base × altitude. Taking the derivative with respect to time, we get dA/dt = 1/2 × (d/dt)(base) × altitude + 1/2 × base × (d/dt)(altitude).

Now, we are given that dA/dt = the rate of change of the area = a constant value. Also, we know that (d/dt)(altitude) = the rate of change of the altitude = b cm/min.

Therefore, we can substitute these values into the formula above to get:

a = 1/2 × (d/dt)(base) × h + 1/2 × base × b

We want to find (d/dt)(base) when h and a are given. Since h is given, we can solve for (d/dt)(base) by isolating it in the equation above:

(d/dt)(base) = (2/a) × (a - 1/2 × base × b)/h

Substituting the given values of h and a, we get:

(d/dt)(base) = (2/60) × (120 - 1/2 × base × b)/6

where b is given in cm/min. Simplifying this expression, we get:

(d/dt)(base) = (20 - 1/12 × base × b) cm/min

Therefore, the rate of change of the base of the triangle is (20 - 1/12 × base × b) cm/min when the altitude is h cm and the area is a sq cm

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There are 12 different combinations of transportation and weather conditions for the family trip to Washington D.C.

To find the total number of different combinations of transportation and weather conditions for the family trip to Washington D.C, we can use the multiplication rule of counting, which states that if there are m ways to do one thing and n ways to do another, then there are m x n ways to do both.

There are three different transportation options: plane, car, and train, and four different weather conditions: sunny, windy, rainy, and cloudy. To find the total number of different combinations, we simply need to multiply the number of transportation options by the number of weather conditions:

Total number of combinations = number of transportation options x number of weather conditions

Total number of combinations = 3 x 4

Total number of combinations = 12

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Answer:

B is the answer

Step-by-step explanation:

Answer:

61.27

Step-by-step explanation:

Circle perimeter formula: C=2πr

Quarter circle=2πr/4. Given r=11cm

                     2x3.14x11/4=17.27

Rectangle perimeter: C=2(a+b)

                                    =2（2+20）=44

so, total: 17.27+44=61.27

The coefficient of determination measures goodness of fit.

The coefficient of determination, often referred to as R-squared, measures the goodness of fit in a regression analysis. It does not measure the independence of variables, economic plausibility, or independence of residuals.

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the function represents exponential decay with a rate of decrease of 5.9% per unit increase in x.

In the exponential function y = [tex]620(0.941)^x:[/tex]

The base of the exponent is 0.941, which is between 0 and 1.

As x increases, the value of [tex](0.941)^x[/tex]gets smaller and smaller, approaching 0 but never reaching it.

Therefore, the function represents exponential decay.

To determine the percentage rate of decrease, we can use the formula:

rate of decrease = (1 - base) x 100%

In this case, the base is 0.941, so the rate of decrease is:

rate of decrease = (1 - 0.941) x 100% = 5.9%

The exponential function is y = 620(0.941)^x.
To determine whether the function represents growth or decay, we need to look at the base of the exponential function, which is 0.941. Since this base is less than 1, the function represents decay.
To determine the percentage rate of decrease, we can use the formula:

r = (1 - b) x 100%
where r is the percentage rate of decrease, and b is the base of the exponential function.
In this case, b = 0.941, so we have:

r = (1 - 0.941) x 100%
= 0.059 x 100%
= 5.9%

Therefore, the exponential function y = 620(0.941)^x represents decay with a rate of 5.9% per unit of x.

A sort of mathematical function called exponential decay can be used to explain a quantity's decline across time or space. The quantity at any given time will change at a pace that is proportionate to the quantity itself, which is characterised by a decreasing rate of change. In other words, the amount of reduction decreases as time or space grows, but it never decreases to zero.

Given the following exponential function, identify whether the change represents growth or decay, and determine the percentage rate of increase or decrease. y=620(0.941)^x y=620(0.941) x

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16.70Therefore, the point estimate that should be used in constructing the confidence interval is -$16.70.

To find the point estimate that should be used in constructing the confidence interval, the formula for the point estimate can be used. The formula is as follows: Point Estimate = Sample Mean of Mail-Order Sales - Sample Mean of Internet Sales = $70.60 - $87.30 = -$16.70.How to find the point estimate?The point estimate is the best estimate of the unknown population parameter based on a given sample of data. In this case, the unknown population parameter is the true mean difference between the mean amount of mail-order purchases and the mean amount of internet purchases.

To find the point estimate, we need to calculate the difference between the sample mean of mail-order sales and the sample mean of internet sales .The formula for the point estimate is given by :Point Estimate = Sample Mean of Mail-Order Sales - Sample Mean of Internet Sales= $70.60 - $87.30= -$

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Answer:

  (a)  5024 ft³

Step-by-step explanation:

You want the difference in volumes of two cones with height 16 ft, where the larger has diameter 40 ft and the smaller has diameter 20 ft.

The volume of a cone is given in terms of its radius as ...

  V = π/3(r²h) . . . . . . r=radius; h=height

The radius is half the diameter, so the formula with diameter is ...

  V = π/3(d/2)²h = π/12d²h

The two given cones have the same height, but different diameters. The difference in volumes will be ...

  V2 -V1 = (π/12)((d2)²h) -(π/12)((d1)²h) = (πh/12)((d2)² -(d1)²)

  V2 -V1 = 3.14(16 ft)/12 × ((40 ft)² -(20 ft)²) = 3.14·16/12·1200 ft³

  = 3.14·1600 ft³ = 5024 ft³

The difference in volumes of the two cones is 5025 cubic feet.

The answer is x=6x +2

Therefore , the solution of the given problem of percentage comes out to be Donica spends $735 in rent.

A statistic or measure that is stated as a percent of 100 is referred to as "a%" in statistics. The terms "pct," "pct," and "pc" are also uncommon. However, it is commonly denoted by the symbol "%". There are no measurements; the proportion of the total sum is flat. Because the numerator of percentages almost always equals 100, they are genuinely integers. Either the percent sign (%) or the word "fraction" must come before a number to indicate that it represents a percent.

Here,

Sales royalty for Donica is calculated as follows:

=>  $12,475 * commission of 4%

=>  $499 commission

Donica's overall earnings for the previous month after deducting the commission were:

Total income equals monthly salary plus commission.

=>  Total income=  $1950 + $499.

=>  $2449 in total profits

We need to multiply Donica's total income by 30% to determine how much she spends in rent:

=>  Rent is 30% of total income.

=>  Rent = 0.3 * $2449 =  $734.70.

When this is rounded to the closest whole integer, we obtain:

=> Rent = $735

Donica thus spends $735 in rent.

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Using the formula for compound interest we find that the annual rate of increase in the cost of firewood is approximately 7.8%.

We can use the formula for compound interest to calculate the annual rate of increase:

A = P(1 + r)^n

where A is the final price, P is the initial price, r is the annual rate of increase, and n is the number of years.

We know that P = $140, A = $182, and n = 4, so we can solve for r:

182 = 140(1 + r)^4

(1 + r)^4 = 1.3

1 + r = 1.3^(1/4)

r ≈ 0.0777

The annual rate of increase is approximately 0.0777 or 7.8% to the nearest tenth of a percent.

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Option (C) yields the perimeter of the supplied figure, which is 45 feet.

In geometry, the perimeter is the overall length of a shape's boundary.

The perimeter of a shape is determined by adding the lengths of all of its edges and sides.

Linear measurements like centimeters, meters, inches, and feet are used to express their dimensions.

So, two circles and one square make up the figure.

A square's perimeter is equal to 4. (side)

The square's side length is 5 feet.

Put the value in the equation as a replacement -

Perimeter of square = 4(5)

Perimeter of square = 20 feet

The circle's radius is equal to 2.5 feet.

A circle's perimeter is equal to 2r.

Put the value in the equation as a replacement -

Perimeter of circle = 2π(2.5)

Perimeter of circle = 5π

Due to the two circles, the circumference is 2 + 5 = 10 ft.

The figure's border measures -

The total perimeter equals the sum of the square and circle perimeters.

Total perimeter = 2.5 + 10π

Total perimeter = 2.5 + 10(3.14)

Total perimeter = 12.5 + 31.4

Total perimeter = 43.9 feet ≈ 45feet

Therefore, option (C) yields the perimeter of the supplied figure, which is 45 feet.

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Correct question:

Which is the best estimate of the perimeter of the figure? Use 3.14 for pie.

Optiοn 2: 40, 80, and 120 square units, is the οnly set οf regiοns fοr the prism's faces that are viable.

A triangular prism is indeed a prism that has three rectangular sides and twο triangular bases. A pentahedrοn, that is. The rectangular base οf the supplied right triangular prism measures b and h and has an area οf bh = 98 square units. Let l stand in fοr the prism's height. The prism's entire surface area is calculated as fοllοws:

2bh + bl + lh

By simplifying and replacing the values οf bh, we οbtain:

2(98) + bl + lh = 466

bl + lh = 135

The areas οf the twο nοn-base sides οf a prism are each (1/2)bl since they are equivalent right triangle with legs b and l. Let's examine each οf the available respοnses tο see if it cοmplies with the requirements:

Optiοn 1: 30, 110, and 190 square units

If the area οf οne οf the nοn-base faces is 110 square units, then (1/2)bl = 110, sο bl = 220. But bl + lh = 135, sο this is nοt pοssible. This grοup οf lοcatiοns is therefοre nοt feasible.

Optiοn 2: 40, 80, and 120 square units

If the area οf οne οf the nοn-base faces is 80 square units, then (1/2)bl = 80, sο bl = 160. This means that lh = 135 - bl = 135 - 160 = -25, which is nοt pοssible. Sο this set οf areas is nοt pοssible.

Therefοre, this set οf areas is nοt pοssible. This grοup οf areas cannοt thus be achieved. If the area οf οne οf the nοn-base faces is 100 square units, then (1/2)bl = 100, sο bl = 200. But bl + lh = 135, sο this is nοt pοssible. Hence, it is impοssible tο cοver this grοup οf areas.

Optiοn 4: 60, 90, and 120 square units

If the area οf οne οf the nοn-base faces is 90 square units, then (1/2)bl = 90, sο bl = 180. This means that lh = 135 - bl = 135 - 180 = -45, which is nοt pοssible. Sο, this set οf areas is nοt pοssible.

Optiοn 2's range οf 40, 80, and 120 square units is the οnly set οf areas fοr the prism's faces that can be cοnsidered.

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The sum of the first 50 terms is 3775. Let a be the first term and d be the common difference of the arithmetic sequence.

Then, the tenth term is a + 9d = 28, and the sum of the fifth and seventh terms is 2a + 12d = 32.

Solving these equations simultaneously, we get a = 2 and d = 3.

To find the sum of the first 50 terms, we use the formula for the sum of an arithmetic sequence:

S50 = (50/2)(2a + (50-1)d) = 25(2 + 49(3)) = 3775.

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