X + 2y - 3z = 11
2x + y + z = -1
x - 3y - z=-8

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?

Which of the following expressions is equal to 2x^2+8

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?