How would I find X? I tried using a2 + b2 =c2 but nothing worked

How many different ways can you make change for $.50 using only nickels,dimes, and quarters?

Alex took his brother to a birthday party. the party was scheduled to last for 1 and 3/4 hours but they stayed for 4/5 of an hour more. how long did she stay at the party?

Drag statements and reasons to each row to show why the slope of the line between d and e is the same as the slope between e and f, given that triangles a and b are similar.