A+3(a−1)=3(2+1) what is a

a=3

Step-by-step explanation:

3×2=6

3×1=3

3×a=3a

3× -1=-3

3a+a+ -3=4a-3

4a-3=6+3

+3 +3

4a=12

÷4 ÷4

a=3

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

part 1 answer = 8

part 2 answer = 72

step-by-step explanation:

part 1 explanation = add all of the numbers, then divide by how many numbers you have. so, 200/25 = 8.

part 2 explanation = not gonna lie, this is hard to explain, so just google how to do it.