From the top of a building 60m high , the angles of depression of the top & bottom of a tower are observed to be 30° & 60° . Find the height of the tower . ​

7x+8y=-18, 4x-9y=-3 solve the system of equations

How many $20 bills do you need to have to make $280

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42