PLEASE HELP

Prove that the diagonals of a parallelogram bisect each other.
Name the coordinates for point C.

(2a + 2b, 2c)

(2a, 2c)

(2a, 2b + 2c)

(2a, 2b)

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Write 17/20 as a decimal and as a percent.

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