. The student council started the year with a balance of −$15 (they were in debt), but after they came up with the idea to sell tickets to a student vs. faculty mud fight, the fund grew by $15 a minute. By the time the student council had a balance of $90, how long had they been selling tickets?

Please Help Me I need a Good Grade.

they have been selling tickets for 7 minutes.

Step-by-step explanation:

Let x represent the number of minutes for which they sold tickets.

The student council started the year with a balance of −$15.

By selling tickets to a student vs. faculty mud fight, the fund grew by $15 a minute. It means that in x minutes, the funds would be

15 × x = $15x

By the time the student council had a balance of $90. The expression would be

- 15 + 15x = 90

15x = 90 + 15

15x = 105

x = 105/15

x = 7

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.

d is the only accurate one

step-by-step explanation: