Joseph earns $15 for every lawn he mows in the amount of money he earns proportional to the number of long as he mows make a table to you identify the type of relationship

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? ?

I'm confused on this could anyone me and show me what i need to do to solve it.