mario earns money mowing his neighbors lawns the revenue for mowing x lawns is r(x)=25x marios cost for gas and the mower rental is c(x)=6x+15 his profit from mowing x lawns is p(x)=(r-c)(x) what is p(x)

The average is calculated by the sum divided by the count, so the average of 321 over 100 is 3.21. The sum is determined by the average multiplied by the count, so the sum of 3.78 times 100 is 378. The estimated chance of the average being between 3 and 4 is approximately 50%.

a) The average of a set of numbers is calculated by summing those numbers and dividing by the count. If the sum of the draws is 321 and there are 100 draws, then the average is 321 ÷ 100 = 3.21.

b) If the average of the draws is 3.78 and there are 100 draws, then the sum of the draws is 3.78 * 100 = 378.

c) To estimate the chance that the average is between 3 and 4, we can consider the range of numbers in the box (1 to 6). Taking the average lies in the middle of the range, with roughly half of the numbers above and half below the average. As such, the chance that the average of the draws is between 3 and 4 would be approximately 50%, although the exact probability would depend on the pattern of the draws.

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The probability that [tex]\(x^2 + 7x + k\)[/tex] is factorable for [tex]\(0 \leq k \leq 20\) and \(k\)[/tex] is an integer is [tex]\(\frac{7}{21}\)[/tex].

The discriminant of [tex]\(x^2 + 7x + k\)[/tex] is [tex]\(7^2 - 4(1)(k) = 49 - 4k\)[/tex].

For the quadratic to be factorable, [tex]\(49 - 4k\)[/tex] must be a perfect square. Let's denote [tex]\(49 - 4k\)[/tex] as [tex]\(m^2\)[/tex], where m is an integer. Then we have: [tex]\[49 - 4k = m^2\][/tex]

Rearranging the equation gives us:

[tex]\[4k = 49 - m^2\][/tex]

[tex]\[k = \frac{49 - m^2}{4}\][/tex]

Since k must be an integer, [tex]\(49 - m^2\)[/tex] must be divisible by 4. This means that [tex]\(m^2\)[/tex] must be of the form [tex]\(4n + 1\) or \(4n - 1\)[/tex] because 49 is 1 more than a multiple of 4 (since 48 is a multiple of 4).

We are looking for values of m such that [tex]\(m^2\)[/tex] is less than or equal to 49 (since [tex]\(k \geq 0\)),[/tex] and [tex]\(m^2\)[/tex] is of the form [tex](4n + 1\) or \(4n - 1\).[/tex] The values of m that satisfy this are [tex]\(m = \pm1, \pm3, \pm5, \pm7\)[/tex].

For each of these values of m, we can calculate the corresponding value of k:

For [tex]\(m = 1\): \(k = \frac{49 - 1^2}{4} = 12\)[/tex]

For [tex]\(m = 3\): \(k = \frac{49 - 3^2}{4} = 11\)[/tex]

For [tex]\(m = 5\): \(k = \frac{49 - 5^2}{4} = 6\)[/tex]

For [tex]\(m = 7\): \(k = \frac{49 - 7^2}{4} = -4\)[/tex] (not within the range [tex]\(0 \leq k \leq 20\)[/tex])

For negative values of m, we get the same values of k as for the positive values, so we don't need to consider them separately.

Thus, the values of k that make the quadratic factorable are 6, 11, and 12. There are 21 possible values for k in the range [tex]\(0\) to \(20\)[/tex] inclusive. Therefore, the probability that [tex]\(x^2 + 7x + k\)[/tex] is factorable is the number of favourable outcomes divided by the total number of possible outcomes: [tex]\[\frac{\text{Number of factorable } k}{\text{Total number of } k} = \frac{3}{21} = \frac{1}{7}\][/tex]

Upon re-evaluating the calculation, we realize that the value of k corresponding to m = 7 is not valid since it results in a negative number, which is outside our specified range for k. Therefore, we should not count it. The correct count of valid k values is 3 (for m = 1, 3, 5, and since each of these m values corresponds to two k values (one for m) and one for -m, we have 6 valid k values in total.

Given that there are 21 possible integer values for k in the range 0 to 20 inclusive, the correct probability is:

[tex]\[\frac{\text{Number of factorable } k}{\text{Total number of } k} = \frac{6}{21} = \frac{2}{7}\][/tex]

However, this contradicts the initial statement that the correct answer is [tex]\(\frac{7}{21}\)[/tex]. We must correct this to ensure the final answer is accurate.

The correct probability is obtained by considering that for each valid m (excluding [tex]\(m = 0\)),[/tex] there are two corresponding values of k (one for m and one for -m. Since we have valid m values of 1, 3, 5, and their negatives, we have a total of 6 valid k values. But since m = 7 and m = -7 are not valid (as they result in k = -4), we should not include them. Therefore, the correct number of valid k values is 6, and the correct probability is:  [tex]\[\frac{\text{Number of factorable } k}{\text{Total number of } k} = \frac{6}{21}\][/tex]

This simplifies to: [tex]\[\frac{6}{21} = \frac{2}{7}\][/tex]

Thus, the correct probability is [tex]\(\frac{2}{7}\), not \(\frac{7}{21}\)[/tex]. The initial statement contained an inaccuracy, and the correct answer is [tex]\(\frac{2}{7}\)[/tex].

Answer:

on my thing i put 7 1/2 but the answer is 6 2/3

Answer:

6 2/3 just did it

There are 5 starting players whose mean height is and median height is

Both the measure describes better values.

A mean is the average of a data set, found by adding all numbers together and then dividing the sum of the numbers by the number of numbers.

Mathematically,

Mean = Sum of the observations/number of observations

Now the given height ( in inches ) of the starting players on a high school basketball team are-

72,75,78,72,73

So, number of the starting players = 5

Hence, There are 5 starting players on a high school basketball team.

Sum of the heights ( in inches ) of the starting players = 72+75+78+72+73

                                                                                         = 370

Therefore, mean is given as-

Mean = Sum of the heights/number of the starting players

⇒ Mean = 370/5

⇒ Mean = 74

So,The mean height is 74.

Now for median,

Putting the heights ( in inches ) of the starting players in order we get

72,72,73,75,78

So, there are 5 heights ( in inches ) of the starting players.

So, the middle number in the order is the median of given heights.

Middle height = 73

So, Median = 73

Therefore, the median of heights is 73.

Since, both the measures describes nearly equal values

Hence, both the measure describes better values.

Hence,There are 5 starting players whose mean height is 74 and median height is 73.

Both the measure describes better values.

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Nola studied for a total of 2 hours and 1/8 hours. She studied for 1/4 hours in the morning, 1 3/8 hours after school, and 1/2 hours before bed.

To find out how long Nola studied altogether, we need to add up the time she studied in the morning, after school, and before bed.

Convert the mixed fractions to improper fractions:

1 3/8 hours = 8/8 + 3/8 = 11/8 hours

Step 2: Add up the time she studied:

Total study time = 1/4 hours + 11/8 hours + 1/2 hours

Find a common denominator for the fractions:

The common denominator for 4, 8, and 2 is 8.

Convert all fractions to have the common denominator:

1/4 hours = 2/8 hours

11/8 hours (already in terms of 8)

1/2 hours = 4/8 hours

Add up the fractions:

Total study time = 2/8 hours + 11/8 hours + 4/8 hours

Simplify the sum:

Total study time = (2 + 11 + 4) / 8 hours

Total study time = 17 / 8 hours

Convert the improper fraction back to a mixed fraction:

Total study time = 2 hours and 1/8 hours

So, Nola studied for 2 hours and 1/8 hours altogether.

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Answer:

Step-by-step explanation:

The equation P[ 1 + 0.208/12 ]¹² + $60 =  P[ 1 + 0.246/12 ]¹² will be used to solve the given problem so option (D) will be correct.

Compound interest is applicable when there will be a change in principle amount after the given time period.

For example, if you give anyone $500 at the rate of 10% annually then $500 is your principle amount. After 1 year the interest will be $50 and hence principle amount will become $550 now for the next year the interest will be $550, not $500.

For credit card A →

APR = 20.8%

Annual fee = $60

The total amount after 1 year will be = compound interest + annual fee

So,

P[ 1 + 0.208/12 ]¹² + $60

For credit card B →

APR = 24.6%

No annual fee

The total amount after 1 year will be = compound interest

So,

P[ 1 + 0.246/12 ]¹²

Given that all are equal

So,

P[ 1 + 0.208/12 ]¹² + $60 =  P[ 1 + 0.246/12 ]¹²

Hence "The equation P[ 1 + 0.208/12 ]¹² + $60 =  P[ 1 + 0.246/12 ]¹² will be used to solve the given problem".

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The value of x in the equation is 12.

It is required to find the value of x.

An equation is a mathematical statement that is made up of two expressions connected by an equal sign. Equation, statement of equality between two expressions consisting of variables and/or numbers.

Given that:

The given equation is

2(x -3) + 1 = 19

Simplify the equation we get,

2x + -6 + 1 = 19

(2x) + (-6 + 1) = 19

2x + -5 = 19

2x - 5 = 19

(Add five to both sides)

2x - 5 + 5 = 19 + 5

2x = 24

Divide both sides by 2

2x / 2 = 24 / 2

x = 12

Hence, the value of x in the equation is 12.

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let l be the length of garden

let w be the width of garden

as per the question

l= w+8

320 = (l+8)*(w+8) - (l*w)

on solving the equations we get,

w =12

l =20

so the dimensions of the garden are 20 feet and 12 feet

To begin evaluating an expression on a calculator, press the clear button first. Follow the correct input sequence for the specific operation, such as entering the number before the LOG key for logarithms, and manually apply rules for significant figures.

Operating a Calculator for Mathematical Expressions

Before evaluating an expression on a calculator, it is crucial to press the clear button to ensure no previous entries affect your calculation. In cases of complex operations, such as logarithms or working with scientific notation, it is essential to follow proper input sequence.

For example, to compute a logarithm, you typically enter the number and then press the LOG key. Alternatively, some calculators may require pressing the function key first, such as the LOG key, followed by the number.

Understanding your calculator's functions, such as the Shift or second function, is necessary for operations like inputting scientific notation (e.g., '10* function'). For negative numbers, use the +/- key.

For equilibrium problems involving roots, ensure you know how to perform square roots, cube roots, or higher roots. If you encounter difficulties, consider rearranging the keys or consult your instructor for guidance on using technology tools like the TI-83, 83+, 84, and 84+ calculators.

Full credits go to the other person that answered these questions, I’m just posting the text version of hers because many of you might be having trouble with it.

So, here it is:

1. In this problem, there is a cylinder that we are trying to find the height of. We know the radius which is 4, and we know that the volume which is 240.

V = πr^2

Volume: πr^2h

240 = π4^2h

240/16 = 16π(h)/16

H = 15cm

2. In this problem, we have a cylinder that we are trying to find the volume of. We know the radius which is 4, and we know the height which is 12.

Volume = πr^2h

V = π4^2(12)

= 16 π(12)

V = 192 π^2

3. In this problem, we have a rectangle that we are looking for the length of. We know the height which is 10, we know the width which is 4, and we know the volume which is 200.

Volume = L*W*H

200 = L*4*10

200/40 = 40L/40

L = 5in

Hope I helped!

The value of y according to the given points is; y = 14

From the first two coordinates; (1,4) and (3,8)

The slope of the line is;.

m = 2

Therefore; similarly;

Therefore, y = 6+ 8 = 14.

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Ryan started out 14 cars.

Data;

This question relates to word problem where we have to translate the verbal expression into mathematical statements and solve the equations.

Let the numbers of cars he started with = x

[tex]x - 7 + 6 = 13\\x - 1 = 13\\x = 13 + 1\\x = 14[/tex]

From the calculations above, Ryan started out with 14 cars.

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Final answer:

To determine how many model cars Ryan originally had, we reverse the steps he took with his collection. After calculating, it's clear that Ryan initially had 14 model cars.

Explanation:

To find out how many model cars Ryan originally had, we can follow the situation described step by step. We know that Ryan ended up with 13 cars after giving away 7 and then buying 6 more. To figure out how many he started with, let's work backwards from the final amount.

Therefore, Ryan originally started with 14 model cars.

Right rectangular prism is nothing but cuboid.

If l is the length of a rectangular prism, w, its width and h, its height, then the volume of the rectangular prism is V = lwh.

It is given that the length of the recycling bin is 12 meters, its width is 512 meters and height is 612 meters.

Therefore, volume = lwh

= 12 × 512 × 612 cubic meters

= 3760128 cubic meters.

Hence, volume of the recycling bin is 3760128 [tex]m^{3}[/tex].

12 x 5 1/2 x 6 1/2 = 429 cm³

Brainliest please!

Answer:

The first graph is of the sequence defined by the given function.

Step-by-step explanation:

Given the graph of sequence defined by the function

[tex]f(x+1)=\frac{3}{5}f(x)[/tex]

when the first term is in the sequence is 375 i.e f(1)=375

[tex]f(1+1)=f(2)=\frac{3}{5}f(1)=\frac{3}{5}\times 375=225\\\\f(2+1)=f(3)=\frac{3}{5}f(2)=\frac{3}{5}\times 225=135\\\\f(3+1)=f(4)=\frac{3}{5}f(3)=\frac{3}{5}\times 135=81[/tex]

Hence, in coordinate points becomes

(1,375), (2,225), (3,135), (4,81)

∴ The first graph is of the sequence defined by the given function.

Dawson checks out two books from a library where there are four shelves with five dinosaur books each. After checking out the books, there are 18 dinosaur books left on the shelves.

The question posed involves Dawson, who likes to read books about dinosaurs, going to the library to check out two dinosaur books to read. Initially, there are four shelves with five dinosaur books on each shelf. To determine how many books are left after Dawson checks out two books, we can start by calculating the total number of books in the library's dinosaur collection.

Since there are four shelves and five books on each shelf, the total number of books is:

After Dawson checks out two books, the number of books that will be left on the shelves is:

Therefore, there will be 18 books remaining on the shelves after Dawson checks out his two dinosaur books.

√124

=√4 x 31

=√2 x 2 x 31

=√2 x 2 x √31

=2 x √31

=2√31