6.) Which is the best description of the equation
below?

2x-2y=6

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=9, and ac=12, find hc.

An advertising firm has an old computer that can prepare a whole mailing in 6 hours. with the of newer model the job is complete in 2 hours. how long would it take the newer model to do the job alone?

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?