in this problem, we have two things to choose, the chair lift and the ski trail, with 3 options for the chair lifts, and 6 options for the ski trails.
The total number of combinations is obtained by multiplying the number of options for each one of the things that we have to choose; in this case, it is 6*3 = 18 total combinations.
D. y=mx+b. m being slope and b being the y intercept. so the equation for the line is y=3x+2 and to be parallel your m must be the same number so D. 3x
