The sum of three consecutive even numbers is -90. What is the smallest of these numbers?​

Can someone me and do the problem plz so i can understand it more better

If square root x = -7, then x= -49 true or false

The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)