Does a=20,b=21,c=23 form a right triangle ?

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).

Through non-collinear points there is exactly one plane.

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x