Can someone awnser 1 through 4 much appriacted plz

What is the slope of the line shown below?

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

Find the domain and range of the following function f(x) = 51x - 21+ 4