Last week bananas costed 0.79 per pound this week they cost 0.89 per pound (need the percent change)

  12.7% increase

Step-by-step explanation:

The percentage change can be found from ...

  (change)/(original) × 100%

  (0.89 -0.79)/(0.79) × 100% = 10/79 × 100% ≈ 12.7% . . . increase

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.