I need help solving these 3

Acylinder with a base diameter of x units has a volume of jxcubic units which statements about the cylinder are true? check all that apply. the radius of the cylinder is 2 x units. the radius of the cylinder is 2x units. the area of the cylinder's base is 200 square units. the area of the cylinder's base is a square units. the height of the cylinder is 2x units. the height of the cylinder is 4x units. mark this and return save and exit next submit

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?

For what values of a is the sum of the fractions 2a−1 / 4 and a−1 /3 positive?