Kira purchased a prepaid phone card for $20. Long distance calls cost 14 cents a minute using this card Kraused her card only once to make a long distance
call. If the remaining credit on her card is $17.48 how many minutes did her call last?

answer: hey there,

the answer you are looking for is a..

hope this you!

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.