Question

Please help and explain to me how to solve this

Answer 1

Given:

There is a graph given in the question

Required:

We need to find the approximate cost of year 1987

Explanation:

Here we can see in the graph that

There are two points as

$\begin{gathered} (x_1,y_1)=(1983,5093) \\ (x_2,y_2)=(1991,10027) \end{gathered}$

Now by using midpoint formula

$(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})=(\frac{1983+1991}{2},\frac{5093+10027}{2})=(1987,7560)$

Final answer:

The approximate cost of year 1987 is $7560