Question

The second term of a geometric sequence is 17.5 and the third term is 122.5. What is the common ratio? What is the first term?​

Answer 1

Explanation:

U2=ar

U2=17.5

U3=ar^2

U3=122.5

U3/U2=122.5/17.5

ar^2/ar=7

r=7

17.5=ar

17.5=7a

a=2.5