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3 years ago

PLEASE PLEASE PLEASE HELP!!

Mathematics

1 answer:

Bad White [126]3 years ago

5 0

Answer:

B is the answer.

Since 7 and 12 are both the legs of the right triangle, we are going to use pythagorean theorem.

${7}^{2} + {12}^{2} = {c}^{2}$

Isolate side c

$\sqrt{ {7}^{2} + {12}^{2} } = c$

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The average value of two positive numbers is 30% less than one of the two numbers. By which percentage is average value bigger t

Viefleur [7K]

Answer:

75% bigger

Step-by-step explanation:

Let the first number be x and the second be y.

So:

$Average = \frac{x + y}{2}$

And:

$Average = (1 - 30\%) * x$ -----30% less than x

Substitute $Average = (1 - 30\%) * x$ in $Average = \frac{x + y}{2}$

$\frac{x + y}{2} = (1 - 30\%) * x$

$\frac{x + y}{2} = (1 - 0.30) * x$

$\frac{x + y}{2} = 0.70 * x$

$\frac{x + y}{2} = 0.70x$

Cross multiply

$x + y = 0.70x * 2$

$x + y = 1.40x$

Collect like terms

$1.40x - x = y$

$0.40x = y$

Make x the subject

$x = \frac{y}{0.40}$

$x = 2.50y$

So, the average is:

$Average = (1 - 30\%) * x$

$Average = (1 - 30\%) * 2.50y$

$Average =0.70 * 2.50y$

$Average =1.75y$

Rewrite as:

$Average =(1 + 0.75)y$

Express as percentage

$Average =(1 + 75\%)y$

This means that the average is 75% bigger than the second number

6 0

2 years ago

On Wednesday, James slept for <img src="https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7B8%7D" id="TexFormula1" title="\frac{3}{8}" alt=

Hatshy [7]

Answer:

I believe he slept for 9 hours of the day

Step-by-step explanation:

⅜ of 24

24 ÷ 8 = 3

3 × 3 = 9

8 0

2 years ago

Carl, Gilda, Conroy, and Kyla are the four candidates in a school election. Carl received 1/5 of the votes, Gilda received 5% of

Juliette [100K]

Firstly, we can convert all of the fractions into percentages. To do this, we need to make the denominator of the fraction 100, and whatever we do to the denominator we must also do to the numerator.

5 x 20 = 100
1 x 20 = 20.

So Carl recieves 20/100 or 20% of the votes.

4 x 25 = 100
1 x 15 = 25

So Conroy receives 25/100 or 25% of the votes.

If we add these together and Gilda's 5%, we get 50%. Since there are 100% votes overall, we need to do 100 - 50 = 50.

Kyla receives 50% of the votes.

8 0

3 years ago

Read 2 more answers

Mary tutors english. For each hour that she tutors she earns 40 dollars. Let E be her earnings (in dollars) after tutoring for H

AleksAgata [21]

Answer:

A.) 40(t) = E

B.) 520

Step-by-step explanation:

t is for time, E is the total, H is the hourly rate.

plug in the numbers to get 40(13) = h and solve for H and you get 520

<em>-- Brainliest answer is much appreciated! :)</em>

7 0

3 years ago

four friends went shopping for school supplies the table shows the number of school supplies each Brown bought and the total cos

allsm [11]

Average cost = Total cost / Number of supplies

$\begin{gathered} \mu=\frac{T}{n} \\ \text{For Rosa} \\ \mu=\frac{29.91}{3}=9.97 \\ \text{For }Ellis \\ \mu=\frac{31.44}{4}=7.86 \\ \text{For }Andie \\ \mu=\frac{45.04}{4}=11.26 \\ \text{For }Keondre \\ =\frac{54.85}{5}=10.97 \end{gathered}$

5 0

1 year ago