Multiply and simplify (3-5i)(-2+4i)

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

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

In a column proof the right column states your reasons