A rectangular whiteboard has an area of x^2-12x-45. Which expression could
represent the width of the board?
(A) x-45
(B) x-3
(C) x+3
(D) x+1

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.