A plane flew from Smithtown to Johnsville and back. The duration of the trip there was 1 hour less than the duration of the trip back. The average speed on the trip there was 300 mph. The average speed on the trip back was 280 mph. How many hours did the trip take?

wow

Step-by-step explanation:

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb

any of them that add up to 180 degrees.