Answer:
13
Step-by-step explanation:
f(x) = 3x + 7
f(2) = 3(2) + 7
f(2) = 6 + 7
f(2) = 13
someone solve it please usuck
I'm not sure Google it tho might help
Is it cool?
use this formula Sn=n/2[2a+(n-1)d]
here,d=a2-a1 and n= no. Of terms
S8=8/2[2(1)+(8-1)2]
S8=64