Combine the radicals -2 Square root 13 + 19 Square root 13

Don't know how to find x given these segment lengths

Answer for 10 points show work you guys in advanced < 3

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