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3 years ago

Simplify 78 - 74 A. 712 B. 74 C. 7-4 D. 72 su Thanks

Mathematics

1 answer:

boyakko [2]3 years ago

4 0

Hey!

Divide the exponents. 8/4=2

So your answer its D.

Hope this helps!

<h2><em>~~~PicklePoppers~~~</em></h2>

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Deion practiced piano for 5/6 hour on Saturday. On Sunday,practiced 1/2 as long as on Saturday. Which best describes how long De

Contact [7]

I think the answer would be D

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3 years ago

Read 2 more answers

The ratio of boys to girls in a group is 7:1. If there are 66 more boys than girls, work out how many girls there are

nevsk [136]

Answer:11

Step-by-step explanation:

Boys : girls=7:1

Sum of ratio=7+1=8

Let them number of girls be y

Then they number of boys=y+66

Total number of pupils=y+y+66

Total number of pupils=2y+66

Number of girls=(girls ratio)/(sum of ratio) x (total number of pupils)

y=1/8 x (2y+66)

Cross multiply

y x 8=2y + 66

8y=2y + 66

Collect like terms

8y-2y=66

6y=66

Divide both sides by 6

6y/6=66/6

y=11

The number of girls is 11

4 0

3 years ago

Graph the function. Then State the domain and range. Also increasing and decreasing

masha68 [24]

Answer:

See below, I will let graphing part to yourself.

Step-by-step explanation:

First function: domain: $[-9,\infty)$ , range: $(-\infty, -2]$ , decreasing

Second function: domain: $(-\infty, \infty)$ , range: $(-\infty, \infty)$ , increasing

Third function: domain: $[3, \infty)$ , range: $[-5,\infty)$ , increasing

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3 years ago

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Susan works as a tutor for $10 and hour, and as a waitress for $11 an hour. This month, she worked a combined total of 90 hours

uysha [10]

Answer:

$\$(990-t)$

Step-by-step explanation:

The correct question is

Susan works as a tutor for $10 and hour, and as a waitress for $11 an hour. This month, she worked a combined total of 90 hours at her two jobs. Let t be the number of hours Susan worked as a tutor this month. Write an expression for the combined total dollar amount she earned this month

Let

t -----> the number of hours that Susan work as a tutor

y ----> the number of hours that Susan work as a waitress

z ---> the combined total dollar amount she earned this month

we know that

$t+y=90$

$y=90-t$ -----> equation A

we know that

The combined total dollar amount she earned this month is equal to the number of hours that Susan work as a tutor multiplied by $10 plus the number of hours that Susan work as a waitress multiplied by $11

$z=10t+11y$ ----> equation B

substitute equation A in equation B

$z=10t+11(90-t)$

$z=10t+990-11t$

$z=990-t$

therefore

The expression for the combined total dollar amount is $(990-t)

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3 years ago

Which is the solution to (8.5 x 103)(2 x 105) expressed in scientific notation?

kenny6666 [7]

We have been given an expression $(8.5\times 10^3)(2\times 10^5)$ . We are asked to find the solution to our given expression expressed as scientific notation.