The hole for a support post needs to be 6 feet deep. it is currently 1 foot 8inches deep. how much deeper must the hole be? 12in/1f

52 inches more deep

Step-by-step explanation:

because she already has 20 inches and then she needs 72 inches so 20-72 gives 52

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

77

step-by-step explanation: