Which expression correctly factors the polynomial?
9x2 - 49
a. (3x – 7)?
b. (3x – 7)(3x + 7)
c. (9x + 7)(x - 7)
d. (9x - 7)(x + 7)

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?

Guys i really need or i have to stay late up night

To which sets of numbers does -12 belong? choose all answers that are correct. a) natural numbers b) integers c) real numbers d) irrational numbers