You sign up for 13th weeks of swim lessons. there is 26$ sign up-fee. the total cost is $325 what is the cost per week?

So you wanna take the total of $325 and subtract the original fee of $26 so you have $299. You take the $299 and divide it by 13. That gives you $23, your answer is 23.

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2