If f(n)= (n-1) power of 2 + 3n , which statement is true ?

What is the length of the unknown leg in the right triangle ?

Calculate the average rate of change over the interval [1, 3] for the following function. f(x)=4(5)^x a. -260 b. 260 c. 240 d. -240

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test