Simplify the mathematical expression below 3/4p-2/3r-1/2p-1/6r

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?

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

When x = 3 and y = 5, by how much does the value of 3x2 – 2y exceed the value of 2x2 – 3y ?