9x(x+6)–(3x+1)^2=1
please solve. will mark brainliest for correct answer

Find the volume of the described solid. the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x. a) 441b) 147c) 864d) 882

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two