Find numerical value if x=1 and y=5
4(x+y)

Simplify the expression 10/11(22z) + (a+5) -1

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

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.