The cube root parent function is reflected across the x-axis, vertically stretched by a factor of 3

How do you answer this question? (step by step)

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

Which type of graph would allow us to quickly see how many students between 100 and 200 students were treated?