Can someone me solve this everytime i try it says im wrong

You make and sell triangular flags. each flag has a base of  3.53.5  feet and a height of  2.52.5  feet. fabric for the flags costs  $0.40$0.40  per square foot. what is the cost to make one flag?

I’m which figure is point g an orthocenter

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?