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Sladkaya [172]
3 years ago
12

If f(x) = -2x -7 what is f(4) and f(-5)​

Mathematics
1 answer:
gayaneshka [121]3 years ago
5 0

Answer:

F(4) = -15

f(-5) = 3

Step-by-step explanation:

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(85 x 255) / 289 + 15 - 70 =
ANEK [815]
I do believe its twenty

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3 years ago
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Which expressions have products less than 3 3/5?<br> (Select all that apply)
Sergeeva-Olga [200]
1, 3 and 4.

1. 3,6>0,9
2. 3,6<4,725
3. 3,6>1,575
4. 3,6>0,54
3 0
3 years ago
The price of a $250 cost increased by 7% last year. The coat is now on sale for one half off. What is the sale price
Semenov [28]

Answer:$133.75

Step-by-step explanation:

$250 is 100%

? is 107%

$2.5 is 1%

$267.50 is 107%

267.50/2=$133.75

5 0
3 years ago
4) If x-1/x=5, fand the value of x²+ 1/x²​
tangare [24]

Given:

\sf x\ -\ \dfrac{1}{x}\ =\ 5

To find:

\sf The\ value\ of\ x^2\ +\ \dfrac{1}{x^2}.

Answer:

\sf x\ -\ \dfrac{1}{x}\ =\ 5

Let's square the above expression.

\sf \bigg(x\ -\ \dfrac{1}{x}\bigg)^2\ =\ 5^2

According to the identities, (a - b)² = a² - 2ab + b². Using the same logic for the expression above,

\sf x^2\ -\ 2\ \times\ x\ \times\ \dfrac{1}{x}\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ -\ 2\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 25 + 2\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 27

Therefore, the value of x² + 1/x² is 27.

8 0
3 years ago
Waldo measured the width of a window seat as 4.23 feet, but the actual width was 5 feet. What is the percentage of error in Wald
kirza4 [7]

Answer: d. 15.40%

Step-by-step explanation:

Divide 4.23 by 5 to get the percentage.

Subtract this number (.846) from 1 to get the answer: .154 or 15.40%

4 0
3 years ago
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