Multiply the polynomial 2x(x−3) a)2x^2-6x b)2x-6 c)x^2-6

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b