Q2: Solve each of the following problems: (Show your steps) A- A sphere with radius R has the volume V (in cubic units) given by the formula: V=4r3, where r is the radius of the sphere. 3 What would be the volume of that sphere if we reduce its radius by 1 ? B- A disk with radius R has a surface area S=R2 (in square units). i. Find the surface area of this disk if its radius R=x(y+1) ii. What would be its circumference if x=2 and y=3