Write the sentence as an algebraic equation. The product of k and -9 is 17.
how do i write this..?

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?

Given that abcd is a rhombus, what is the value of x?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.