The function f(x)=4(2)^x represent the number of people who share a cat video x hours after it first appears on a website. How d
oes the number of people sharing the video change each hour? A.the number increases by 2 each hour.B. The number doubles each hour.C.the number increases by 4 each hour.D. The number increases by a factor of 4 each hour.
y = a(1+r)ˣ, where a is the initial value, r is the growth rate (as a percentage) and x is the number of time periods.
For our problem, the initial value is 4. Since 1+r = 2, this means r = 1; this means the value increases by 100% each time. This is the definition of doubling.
