Carl creates a rectangle with an area of 12 square units and a perimeter of 14 units..create a rectangle with the same area as Carl's rectangle but a different perimeter

Find the lengths of the diagonals of this trapezoid.

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

We just started the introduction into circles and i have no idea how to do this.