What’s the answer and can someone please explain it?

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

Askyscraper is 396 meters tall. at a certain time of day, it casts a shadow that is 332 meters long. at what angle is the sun above the horizon at that time?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?