Sue and fred have a combined age of 42 years. if sue's age is 1/2 of fred's, how old is fred in years?

If f(x)= 3x+6 which of the following is the inverse of f(x)

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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