An electronics store sells an average of 60 entertainment systems per month at an
average of $800 more than the cost price.
For every $20 increase in the selling price,
the store sells one fewer system. What
amount over the cost price will maximize
profit?
if

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

Multiply. −2x(6x4−7x2+x−5) express the answer in standard form. enter your answer in the box.

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?