Music Systems, Inc. allows a 10% discount if a purchase is paid for within 30 days. An additional 5% discount is given if the purchase is paid for within 15 days. Justin buys a sound system that originally cost $360. If he pays the entire amount at the time of purchase, how much does he pay for his system after both discounts?

$306

Step-by-step explanation:

=15/100=X/360

=360x15= 5400

=5400/100= 54

=54-360= 306

=$306

He payed $306 for his final price

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

7

step-by-step explanation: