The graph shows the height of a staircase in inches based on a certain number of stairs. according to the function in the graph, what is the height of a staircase with 100 stairs? round the answer to the nearest inch if necessary. 40 inches 20 inches 500 inches 700 inches

Option D 700 inches.

Step-by-step explanation:

Given is a graph which shows the height of a staircase in inches based on a certain number of stairs.

Let us consider the no of stairs as x and vertical height of stairs as y.

y is directly proportionl to x.

The stair case elevation is a straight line starting with (0,0) and a point (50,350)

Hence we can write  y = 7x

When no of stairs = x =100, we get

y = 7(100) = 700 inches.

Option D 700 inches.