Amechanic buys $14.56 worth of parts from a supplier. if he pays for the parts with a $20 bill, how much change will he receive?

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

Me n o w. i need t h i s. 10 points