Solve for x.
16x^2- 9=0

Annie walked her dog 2 1/4 miles from her house to the dog park and 3/7/8 miles around the park. then she walked the same distance home. how many miles did she walk in all?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Given the diagram below, michael writes, "segment ac is congruent to segment ac." which of the following reasons allow him to write this statement?