Twice a certain number is equal to the number the result is 21 Find the number

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

The angle of elevation from point a to the top of the cliff is 38 degrees. if point a is 80 feet from the base of the cliff , how high is the cliff ?

Suppose you can spend at most $12. create an inequality that represents this restraint. then find at least three ordered pair solutions representing the number of boxes of candy and combos you can buy