Explanation:
Please draw your graph on graph paper unlike me with a proper scale to get accurate results. for parts d and e, I simply substituted the known value back into the original equation s= 20+ 5(t) for each one to either find the s or t value. But the question said to use your graph so you must extrapolate your graph (find the corresponding value for the value they gave) and put that answer. your answer should be correct even if it's a point off from the accurate answer.
draw graph and curve in pencil. you can even shade the region between t=0 and t=10.
if you have any questions feel free to ask, and I apologize if the work is a bit messy :)