9. Which is a solution of the equation 5(x – 8) = -55 ? a) x = 3
b) x = 13
c) x = -3
d) x = -9.4

c. x = -3

5(x - 8) = -55

⇔ 5x - 40 = -55

⇔ 5x = -55 + 40 = -15

⇔ x = -15/5

⇔ x = -3

Step-by-step explanation:

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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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.