Which polynomial is a quintic trinomial? x³ + 2x² -8x + 16 x² + 4 3x⁵ + 7x² -9x⁴ -x⁴ -5x² +1

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.