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sweet-ann [11.9K]
3 years ago
10

If f(x) =4 x-20 , what is f(4)

Mathematics
1 answer:
jolli1 [7]3 years ago
5 0
Answer: -4

Explanation:
f(4) = 4(4) - 20
f(4) = 16 - 20
f(4) = -4
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Scott bought 8 packs of pencils for y dollars per pack. Which expression shows how much Scott pays for the pencils?
allsm [11]

Answer:

your answer would be b

Step-by-step explanation:

got it right

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Find the perimeter of a square with side a. Are the perimeter of the square and the length of its side directly proportional qua
inna [77]

The perimeter of a square with side a = 7.2 cm is 28.8 cm. Yes there exists a direct proportional relationship between Side length and Perimeter of square

<h3><u>Solution:</u></h3>

Given that side of square "a" = 7.2 cm

We have to find the perimeter of square

<em><u>The perimeter of square is given as:</u></em>

Perimeter of square = 4a

Where "a" represents the length of side of square

Substituting the given value a = 7.2 cm in above formula, we get perimeter of square

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<em><u>Are the perimeter of the square and the length of its side directly proportional quantities?</u></em>

\begin{array}{l}{\text { perimeter of square }=4 a=4 \times \text { length of side }} \\\\ {\frac{\text { perimeter of square }}{\text { length of side }}=4}\end{array}

The Perimeter is equal to a constant times the Side length, or the Perimeter divided by the Side length is equal to four. So this is definitely a proportional relationship between Side length and Perimeter.

Two values are said to be in direct proportion when an increase in one results in an increase in the other.

So when length of sides increases, perimeter also increases

Hence perimeter and length of side of square are directly propotional quantities

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3 years ago
5. Solve the equation. 8/x+3 = 1/x+1
Helga [31]

Answer:

x = -5/7

Step-by-step explanation:

8               1

---------- = ----------

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Using cross products

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Distribute

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7x +8-8 =3-8

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7x/7 = -5/7

x = -5/7

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The terms of 12x^2=36=6

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Zina [86]
The answer is b I believe
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3 years ago
Read 2 more answers
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