D. 4 nickels.
This is because when she has 4 nickels that equals 20 cents. And that means that the rest are dimes. So a dollar worth of dimes would be ten dimes. and Ten dimes and 4 nickels equal 14 coins and $1.20
6 hours
Working;
If 12 cookies take 30 minutes,
Then one cookie takes

144 cookies would take <span>

* 144
=360 minutes or 6 hours</span>
You take the area and find the square root
V V
16 √
so you would be looking for √16 which equals 4
then you would add 4 by the length of the other 4 side to find the perimeter, which is ironically 16
I think it is 0.14 or 0.24