Answer:
b. 75
Step-by-step explanation:
a(n) = a1 + d(n-1)
a(n) = 8.5 + 3.5(n - 1)
a(20) = 8.5 + 3.5(20 - 1)
a(20) = 8.5 + 3.5(19)
a(20) = 8.5 + 66.5
a(20) = 75
Given the following question:
We are given 12.4%
<span>twice the sum of a number and seven is 8
2(x+7)=8</span>
Just jump the gun and multiply -7 and the value of d
-2[7x^2-24]-31
I got
-14x^2+17
as the total answer btw...