3 years ago

Rewrite the expression by using symbols 7(x - 20)

1 answer:

5 0

7 × x - 7 × 20

You could rewrite it this way, 7 x (x-20), but the answer above is better 'cause it takes away the grouping symbols

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nlexa [21]

Answer:

Increase in area of circle is $263.76$ square mm

Step-by-step explanation:

The actual question is

Find the approximate increase in its area if the radius increases from 20 mm to 22 mm.

Solution

The area of a circle of radius r is given by

$A = \pi r^2$

Area of circle of radius 20 mm is

$A_1 = \pi 20^2\\A_1 = 400\pi$ square mm

Area of circle of radius 22 mm is

$A_2 = \pi 22^2\\A_2 = 484\pi$ square mm

Increase in area of circle

$A_2 - A_1 = 484 \pi - 400 \pi \\A_2 - A_1 = 84 \pi \\A_2 - A_1 = 263.76$ square mm

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3 years ago

wolverine [178]

Answer: a = 64

Step-by-step explanation: the equation for area is a=lw. a = 16(4) which is equal to 64.

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4 years ago

Akimi4 [234]

7.70 isjsndndnjdjsksmms

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4 years ago

Airida [17]

3/4 of 20...." of " means multiply

3/4(20) = 60/4 = 15 onion plants <=

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3 years ago

aliya0001 [1]

5 cubes; if you do it correctly, one block in the middle, 2 on the top, 2 on the bottom

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4 years ago