Evaluate a + b if a = 0 and b = -20

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

Gail is making costumes for a school play. each rabbit costume needs one and one half yards of white fur fabric, a yard of blue striped fabric, and a quarter of a yard of pink felt for the ears. g? ail needs to make eight rabbit man yards will she need, for the white fur fabric, blue striped fabric, and pink felt?

If 3x+8=3x+8 is it one solution or no solution