You are graphing the atomic radius (size of an atom) for the specified elements.   This is a line graph that, but not your typical line graph.  
You will have a set of lines using regular pencil (for the Periods) and another set of lines using colored pencils (for the Groups).

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter