Suppose that a virus doubles every 3 hours. If a person has 30 virus cells, how many will he have after 9 hours?

Question

I got 810,000.
30*30=900
900*900=810,000

or would it be 240 since
30*2=60
60*2=120
120*2=240

Answer 1

Viruses = 30 * 9/3 * 2 = 180

Answer 2

In typing exponents, we use the ^ to show exponentiation
e.g. 2^3 = 2 cubed

number = 30(2)^(t/3) where t is the number of hours

number = 30(2)^3)
= 30(8) = 240

Or

Just do it using basic concepts, like you did in your second solution:

now --- 30
after 3 hours --- 60
after 6 hours --- 120
after 9 hours ---- 240

Answer 3

Thank you, both of you!