PLS HELP QUICKLY The graph of a quadratic function f(x) intersects the x-axis at -3 and 5. What are the factors?​

Taking algebra two apex courses and need with these questions

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

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?