Does a probability distribution function always have a math formula with some parameter(s) in it?

Identify which functions are linear or non-linear. a. f(x) = x2 + 1 b. f(x) = 2x + 5 c. f(x) = x 2 + 3 d. f(x) = 3 x + 7 e. f(x) = 4x + 10 2 - 5

Don't know how to find x given these segment lengths

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t