What is the geometric mean of 6 and 13

Plz i beg u asap ! what is the equation of this graphed line? enter your answer in slope-intercept form in the box.

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b