What is the fourth term in a geometric sequence for a1=10 and r=0.5

For the answer to the question above, I'll show the solution to my answer below.

a2 = a1 * r 
a2 = 10 * .5 = 5 
a3 = a2 * r 
a3 = 5 * .5 = 2.5 
a4 = a3 * r 
a4 = 2.5 * .5 = 1.25 
So the answer to your problem is
1.25

I hope my answer helped you.

Ithink you're supposed to multiply 12.50 which is how much he makes per hour and then multiply it by each number then add whats left togrther and there's your answer