Given the first term and common ratio: Find the 10th Term. The first term is equal to 1 and the common ratio is equal to -2.

-512

Step-by-step explanation:

The appropriate general formula for a geometric series is a(n) = a(1)*r^(n - 1).

In this problem the first term, a(1) = 1, and the common ratio is r = -2.  The pertinent geometric series is thus:

a(n) = (-2)^(n - 1), and the 10th term is a(10) + (-2)^(10 - 1) = -512 = a(10)

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70

b

step-by-step explanation:

the word superfluous means unnecessary