x is partly constant and partly varies with y. when y=3 x=7 and when y=6 x=9.find the relationship between x and y. find x when y=4

Driving 75 mph, it takes alicia 2 hours to reach the airport to go on a vacation. it then takes her 4 hours to get to her destination with the jet traveling at a speed of 400 mph. how many miles does alicia travel to get to her destination?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Describe the domain and range of y=2(3)^x-2+5