What is the answer i’ve been at this for a while?

12x - 4

Step-by-step explanation:

You must distribute the 4 across (x-1), which would be (4x-4), since x*4=4x and -1*4=-4.

The problem with C is that the 4 didn't multiply a negative 1, it multiplied a positive 1.

12x-4

Step-by-step explanation:

First you do parenthesis. 4 times x is 4x and 4 times -1 is -4.

Now you have 8x + 4x -4

Add 8x and 4x which gives you 12x - 4.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: