An = a1 * r^(n-1)
-405 = -5*3^(n-1)
3^(n-1) = 81
3^4 = 81 so n-1 = 3 and n = 4
Sn = S4 = -5 (1 - 3^4) / ( 1 - 3) = 400 / -2 = -200 Answer
Answer:
31.929
Step-by-step explanation:
29.95×6/100=1.797
29.95+1.797=31.929
6x - 12 = 8x + 14
2x = - 26
x = - 13