Why are these rows equivalent? are they even equivalent? please tell me the right answer. 7a+5b−3a+4b
7a+5b+(-3a)+4b

If eh = hg and hg=16, find the diameter of k

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.

The tile along the edge of a triangular community pool needs to be replaced? ?