For what value of b will f(x)=x^2+bx+400 have -20 as it’s only zero

The expression 42 plus 57 shows how much money nate spent at a store .which expression also shows how much money nate spend

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

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =