What number should replace the question mark? 
6-17-7-2
3-24-8-3
8-?-9-1

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

What is the number 321,000,000 in scientific notation? also what is the number? ?

Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid