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AURORKA [14]
3 years ago
11

Use properties of exponents to write an equivalent expression for 5 exponent 4 * 5 exponent -7

Mathematics
1 answer:
Pavlova-9 [17]3 years ago
3 0
Add the exponents together

5^(-2) should be your answer
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Evaluate the expression when x=4 and y+-6.<br><br> x-5y
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I need help with this please
KatRina [158]

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Step-by-step explanation: anything with parentheses means times (×)

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Elena is paid a constant rate for each hour she works. The table shows the amounts of money that Elena earned for various amount
Nikolay [14]

Constant rates are used to illustrate linear functions.

  • The average rate of change is $9.0 per hour
  • The function that models the table is: \mathbf{f(x) = 9x }
  • The amount earned in 7.5 hours is $67.5

<u>(a) The average rate of change</u>

This is calculated using:

\mathbf{Rate = \frac{y_2 -y_1}{x_2 -x_1}}

So, we have:

\mathbf{Rate = \frac{31.5-22.50}{3.5 - 2.5}}

\mathbf{Rate = \frac{9}{1.0}}

\mathbf{Rate = 9.0}

Hence, the average rate of change is $9.0 per hour

<u>(b) A function that models the table of values</u>

Let x represent hours, and y represent the earnings.

So, we have:

\mathbf{y =m (x - x_1) + y_1}

Where:

m =Rate = 9.0

So, we have:

\mathbf{y = 9(x - 2.5) + 22.5}

Expand

\mathbf{y = 9x - 22.5 + 22.5}

\mathbf{y = 9x }

Represent as a function

\mathbf{f(x) = 9x }

Hence, the function that models the table is: \mathbf{f(x) = 9x }

<u>(c) Amount earned for 7.5 hours</u>

This means that x = 7.5

So, we have:

\mathbf{f(7.5) = 9 \times 7.5 }

\mathbf{f(7.5) = 67.5}

Hence, the amount earned in 7.5 hours is $67.5

Read more about constant rates at:

brainly.com/question/23184115

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2 years ago
PLEAES HELP ME I SUCK AT MATH!!
ehidna [41]

Answer:

its 5

Step-by-step explanation:

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2 years ago
Given b = 4 and c = -5, evaluate b 2 - c 2.<br><br> 41<br> -2<br> -9
LekaFEV [45]
I hope this helps you

6 0
3 years ago
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