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3 years ago

(4) Sammi has a 76% average after 5 tests

Mathematics

1 answer:

telo118 [61]3 years ago

6 0

Sammi would have to get an 84% on her next test for her average to go up to an 80

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A certain restaurant sells coffee for 2.00 and donuts for 1.50. If the restaurant sold 80 items and earned 141.50 how many donut

Korvikt [17]

Answer:

$280

Step-by-step explanation:

if you do 2.00+1.50 you get 3.50. Then you do 3.50 ×80 you get 280 dollars

6 0

4 years ago

Find the inverse of the given function

xenn [34]

For this case, we must find the inverse of the following function:

$f (x) = \frac {5x + 1} {- x + 7}\\x\neq 7$

To find the inverse we follow the steps below:

$y = \frac {5x + 1} {- x + 7}$

We rewrite the denominator:

$y = \frac {5x + 1} {- (x-7)}\\y = - \frac {5x + 1} {(x-7)}$

We exchange variables:

$x = - \frac{5y + 1} {(y-7)}$

We solve for y:

We multiply on both sides of the equation by (y-7)

$x (y-7) = - 5y-1\\xy-7x = -5y-1$

We subtract xy on both sides of the equation:

$-7x = -5y-1-xy$

We add 1 to both sides:

$-7x + 1 = -5y-xy$

We factor for y:

$-7x + 1 = y (-5-x)$

We divide both sides by (-5-x):

$y = \frac {-7x + 1} {- 5-x}$

So, we have:

$f ^ {- 1} (x) = \frac {-7x + 1} {- 5-x}$

Answer:

$f ^ {- 1} (x) = \frac {-7x + 1} {- 5-x}$

$x\neq -5$

3 0

4 years ago

7x − 3(x − 1) = 2(2x + 3)

Arte-miy333 [17]

Answer:

no solution

Step-by-step explanation:

5 0

4 years ago

Is 9r+16=π/5 a literal equation?

Karo-lina-s [1.5K]

This is not a literal equation but you can divide 3.14 divide by 5.

Step-by-step explanation:

7 0

3 years ago

Find 5 1/2% of $2800

Anni [7]

5.5% of 2800 =
0.055 * 2800 = 154 <==

6 0

3 years ago