Find the mean(average) of this set of data 100 400 20 40 30

That table shows measurements (in invhes$ from cubes with different side lengths. which pairs of variables have a linear relationship? check all that apply

Find the equation of a line whose slope is 2/5 and y- intercept is 2.write your answer in the form 1) ax+by+c=02) x/a+y/b=1

If f(x)=-3x+2 and g(x)=-7x-2, which point represents f(x)=g(x)?