SOMEONE PLEASE HELP ?

Prove that the diagonals of a parallelogram bisect each other.
The midpoint of BD is

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.