Answer:
Step-by-step explanation:
-18
6a−1+3b
explanations:
1) simply 1 x b to b
9a+8+b−3a+2b−9
2)collect like terms
(9a−3a)+(8−9)+(b+2b)
then simplify: 6a−1+3b
c) 1,381.5.
First term = 3.1 *1 - 2 = 1.1
2nd term = 3.1*2 - 2 = 4.2
3rd term = 3.1*3 - 2 = 7.3
so the common difference d = 3.1.
S30 = (30/2) [ 2* 1.1 + (30-1) * 3.1)]
= 1,381.5.
Answer:37
Hope this helped!
