4x (2w - 5) x (w+3). can someone me with this ?

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?