I am totally lost on this question

[Browni3141]

the total for n days is pow(2,days)-1.

Almost, try .01*(pow(2,days)-1) to get it in dollars.

[qwertyasdfgh]

red line under pow..can't use it

[rocketboy9000]

right, I keep forgetting that. include "math.h"

[qwertyasdfgh]

i included cmath already still

[Browni3141]

I tried it with math.h and it works. However, I don't know why it won't work with cmath.

[rocketboy9000]

are you using namespace std?