An unknown number why is 20 more than an unknown number X the number YXX and why are shown below is X +20 Y equals negative X +2 step to find X and y

Arectangular exercise mat has a perimeter of 36 feet the length of the mat is twich the width writeand solve an equation to determine the length in feet. of the mat then find the area in square feet of the mart

What is the y intercept of f(x)=(1/2)^x?

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.