What is x + 3/11=51/22

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Find the length of the following tangent segments to the circles centered at o and o' whose radii are 5 and 3 respectively and the distance between o and o' is 12. what is the tangent segment of cd?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x