HELP! Almost due! Look at picture below to see the one problem.

Find the value of x for which line a is parallel to line b

The table below shows the approximate height of an object x seconds after the object was dropped. the function h(x)= -16x^2 +100 models the data in the table. for which value of x would this model make it the least sense to use? a. -2.75 b. 0.25 c. 1.75 d. 2.25

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?