How could you estimate the sale price of items that are 1/4 off

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?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?