Hannah approximates the area of circles using the equation A = 3r2 and records areas of circles with different radius lengths in a table. Answer parts a and b.
Radius (in.) 2 3 4
Area (in 2
12 27 48 75 108
5
6
a. Graph the ordered pairs from the table. Choose the correct graph below.
OA
.B
12017
12018
100
100
80
80
.
3.
Area (A)
60
Area (A)
60
.
40
40
.
20
20
.
0
2
4 6 8
10 12
6 8 8 10
10 12

In order to solve this question we first have to break down the terms.

Sum = Adding
Times = Multiplying.

The question states "3 times the sum of a number n and 12 is 45". In written form, it would be the following:

3(12+n) = 45

To solve this you first divide both sides by three and you'd be left with the following:

(12+n) = 15.

Then subtract 12 from both sides. Leaving you with:

n = 3