Question

The number of weeds in your garden grows exponential at a rate of 15% a day. if there were initially 4 weeds in the garden, approximately how many weeds will there be after two weeks? (Explanation needed)

A) 28 Weeds
B) 20 Weeds
C) 11 Weeds
D) 5 Weeds

Answer 1

Since the growth rate is
`15\%`, every week the number of weeds in your garden will be
`1.15` times more than it was last week. We can multiply the original by
`1.15\\` twice, or by
`1.15^2` to get our answer.

`4 \cdot 1.15^2 = 5.29`

We obtained 5.29, which is about
`$5$`, so we have: "D)
`5`" as our answer.