Question

At the end of the first day, 7 weeds appear in your neighborhood park. Each day, the number of weeds increases by 4 times. How many weeds will be in the park at the end of 14 days?

a. 35,456,231
b. 626,349,395
c. 71
d. 392

I thinks b, am i right?

Answer 1

First day: 7 weeds
Second day: 7*4 weeds
Third day: 7*4*4 = 7*(4^2) weeds
...
=> 14th day: 7*(4^13)= 7*67108864 = 469762048