a) Requires you to plot the point on the graph so you'll just have to plot (4,2600) using the graph
c) Here they have given the years as 3.5, using this inorder to determine our value we need to draw a straight line upwards from (3.5,0) and keep extending until it touches the graph.Then draw another line from the point where it touches horizontally toward the left until it cuts the yaxis and that will be your value answer
I hope it's clear I'm really sorry it's so hard to explain in words.
Btw if you could mark it as brainliest that would be great ^^
