What is 2z^4-9z-3z^2 in standard form

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test

To increase her number of students, the instructor put a coupon in the local paper offering to waive the one-time fee for new students. what is the value of the coupon?