From the equation y=3.5x identify the constant of proportionality

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

What is the circumference of a circle with an area of 50.24 cm²?

The equation represents the function f, and the graph represents the function g. f(x)=3(5/2)^x determine the relationship between the growth factors of f and g. a. the growth factor of g is twice the growth factor of f. b. the growth factor of f is twice the growth factor of g. c. the growth factor of f is 2.5 times the growth factor of g. d. the growth factor of f is the same as the growth factor of g.