What substitution should be used to rewrite 6(x+5)^2+5(x+5)-4-0 as a quadratic equation?

For each proportion find the unknown number x 1/5/8=×/15

00 points ! missy’s rotation maps point k(17, –12) to k’(12, 17). which describes the rotation? 270° counterclockwise rotation 90° counterclockwise rotation 90° clockwise rotation 180° rotation

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.