Answer:
The hole is 9 inches deep
Step-by-step explanation:
Volume of a cubicle hole = a^3
Where a= side edge of the cube
Volume of dirt removed = 729 cubic inches
How many inches deep is the hole
729 = a^3
Find the cube root of both sides
3√729 = 3√ a^3
9 = a
a= 9 inches
Check:
9^3
=9 *9*9
= 729
X^2-x-12
FOIL
First, Outside, Inside, Last
First: X*X=X^2
Outside: x*-4=-4x
Inside: x*3=3x
Last:3*-4=-12
All together: X^2-4x+3x-12
Simplify: X^2-x-12
1/4 gallon of water
