6th grade math answer please

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

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Uestion 1(multiple choice worth 5 points) (05.02)alex wants to paint one side of his skateboard ramp with glow-in-the-dark paint, but he needs to know how much area he is painting. calculate the area of the isosceles trapezoid. isosceles trapezoid with top base 12 feet, bottom base of 18 feet, and height of 6 feet. 72 ft2 84 ft2 90 ft2 108 ft2