A. she needs 81sq ft
b. 202.5$
Base = 2 x height (b = 2h)
Area = 1/2 x base x height = 1/2 x 2h x h = h x h = h^2
Answer:
250 mins
Step-by-step explanation:
since number of taps times time is constant
Let
x-------> the length side of the original cube
we have

Divide by
both sides

The system of equations is equal to
--------> equation 
--------> equation 
using a graphing tool
see the attached figure
we know that
the solution of the system of equations is the intersection both graphs
therefore
the solution is

therefore
<u>the answer is</u>

Multiply the number of tosses by the percent of heads:
20 tosses x 0.75 = 15
The answer is 15.