Fast 30 ! what type of solutions do the methods for solving systems of equations find and how does this relate to setting the equations equal to each other

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

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

The function f(x)= -(x+5)(x+1) is down. what is the range of the function?