A surfboard was originally priced at $75 but went on sale for 60% off. If Quincy bought the surfboard and paid 10% sales tax, how much did he pay in total?

$49.5

Step-by-step explanation:

60% of 75$ = 45$

60/100 x 75/100   = 4500

4500/100 = 45

10% sales tax on 45$ = 49.50$

10/100 x 45/100 = 450

450/100 = 4.5

4.5 + 45 = $49.5

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.

the answer is two. hope this !