Question

Charla and David are observing the leaf growth rates of their plants. Charla’s plant starts on day 1 with 43 leaves and gets 1 new leaf a day. David’s plant starts on day 1 with 19 leaves and gets 4 leaves a day.
How many days will it take David’s plant to have as many leaves as Charla’s plant?
7

5

9

8

Answer 1

what is the variable and what is the constant for each plant?

Answer 2

For this question, you could do it by just trial and error.
If you want to mathematical approach...
Pc(Charla's plant)=42+n (where n is the number of days)
Pd = 7n
so we want to find when Pd=Pc
Solving..
7n=42+n
6n=42
n=7.
So, on day 7, David's plant will have as many leaves as Charla's plant.

Answer 3

Therefor answer is the first one. i hope i helped you. if you think i did please mark me as you "best answer" it will be greatly appreciated if you do.

Answer 4

@Gio123 where did you get 7n?

The part for charla's plant is correct. n+43
The part for David's plant should be 4n+19
n+43=4n+19
43=3n+19
3n=24
n=8