Letter tiles spelling TEXAS are placed into a bag. Lisa chooses a tile, replaces it, and then chooses another tile. What expression could represent the probability that she never pulls out an 'X'

Step-by-step explanation:

From my research the graph below is the graph of the problem.
a:   the x-intercept represents the price of the pencils where the company would be at a break even point. this happens when x =0 or x = 10. the maximum y value represents the maximum profit the company makes, which is when the pencils cost $5.
b: using the given graph, obtaining the coordinate points we have: (2,100) and (5,160). we can use the slope formula (y2 - y1 / x2 - x1) to solve for the slope. this is shown below:
( 160-100 / 5-2  ) = 20
therefore, the slope (average rate of change) is 20.