Algebra question

Question

Write the first 5 terms of the geometric sequence if a1=10 and r=1/2

Answer 1

a1 = 10

a2 =10(1/2) = 5

a3 = 10(1/4) = 2.5

a4 = 10(1/8) = 5/4 = 1.25

a5 = 10(1/16) = 5/8 = 0.625

an= a1(r^(n-1))

r=1/2, a1 =10