An online content provider offers two streaming plans. Plan A costs $15 per month plus $4 for each movie streamed during that month. Plan B costs $9 per month plus $6 for each movie streamed during that month.

How many movies streamed would result in both plans costing the same amount

Dis an orderly way to conduct research 

You're asking in the ap section, so i'll give the ap calculus-style answer. alternatively, you can find the vertex of the parabola and use the "y"-coordinate as the answer.

the maximum height can occur at a critical number, that is, a number  such that  .

the derivative of  can be calculated as follows:



find a value of  that is a zero of the derivative:


this is parabola that is opening downward; we can assume there is a maximum at  .

to find that maximum, calculate  .

ash is formed by combustion

explanation: