Idon't know what to do on this question and it's due tomorrow

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Abag of jelly beans contain 13 pink, green, 20 yellow, 10 black, 7 red, and 11 orange jelly beans. approximately what percent of the jelly beans are pink and yellow?

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?