Rico says it's a difference of two squares. Teresa says it's not, because of the exponent n. Who is correct? x^2n-Y^2n

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m