Music Company A charges a 15$ membership fee and 0.75$ each to download a song. Music Company B charges 0.90$ each to download a song with no membership fee.

a. For what number of songs will both companies charge the same amount? Justify your answer using mathematics.
_________ Songs
You anticipate that you will download 150 songs. Which company should you choose if you want to spend the least amount of money? Justify your answer using mathematics.
________ (Type Company A or Company B)