Rewrite the expression (3a^2b^3c^5)/(8x^4y^3z)so that it has no denominator. (note: do not use a fraction line in your answer. also, use ' ' for multiplication between numbers. )

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 20% of a number is 35, what is 50% of that number?

Asphere has a diameter of 10 in. what is the volume of the sphere?