What is this question to the nearest mile ?

Find the equation of the trend line (line of best fit). show your work i'm using the points (34,76) (42,91)

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b