Ella purchased a game that was on sale for 12% off. the sales tax in her county is 6%. let y represent the original price of the game. write an expression that can be used to determine the final cost of the game. y − 0.12y 0.06(0.88y) 1.06(0.88y) y − 0.88y + 0.06y

y:  original price (in dollars)

0.12y:  amount of discount (in dollars)

sale price:  y - 0.12y = 0.88y

sales tax on this sale price:  (0.06)(0.88y)

final cost:  0.88y + (0.06)(0.88y) = 0.88y(1+0.06) =  0.9328y

y − 0.12y

Step-by-step explanation:

d

step-by-step explanation:

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.