Question

Find the first 4 terms of the geometric sequence a1=40 and r=0.5

Answer 1

So the answer to your question is 2.5. Thanks to MissPhiladelphia for her answer.

Explanation:

For the answer to the question above,

a1 = 40

a2 = 20

a3 = 10

..

aN = (1/2^N-1) a1 { in general aN= (r^N-1) A1

a5 = (1/2^4) 40 = 40/16 = 2.5

Answer 2

For the answer to the question above,
a1 = 40
a2 = 20
a3 = 10
..
aN = (1/2^N-1) a1 { in general aN= (r^N-1) A1

a5 = (1/2^4) 40 = 40/16 = 2.5

So the answer to your question is 2.5
I hope my answer helped you. Feel free to ask more questions. Have a nice day!