What is the common difference for the sequence shown below? coordinate plane showing the points 1, 3; 2, 5; and 3, 7

a. −2
b. −one third
c. one third
d. 2

I'll give brainliest if you answer right : )

The table below represents a linear function f(x) and the equation represents a function g(x): x f(x) −1 −5 0 −1 1 3 g(x) g(x) = 2x − 7 part a: write a sentence to compare the slope of the two functions and show the steps you used to determine the slope of f(x) and g(x). (6 points) part b: which function has a greater y-intercept? justify your answer. (4 points)

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)