Which angles of the triangle measure 90 degrees?

I just need clarification

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?

Which of the following will form the composite function?