Hey, could someone please solve the following two questions, showing all steps and not made too complex. Thank you

6. A group of friends plan to go bowling. The bowling facility charges $60 for a group of people to use a lane, and the friends plan to split the cost evenly. One of the friends in the group decides to bring an unexpected date, and so the cost per person ends up being $2 cheaper than expected. How many friends were initially going to go bowling together? [5] 7. Consider the function f (x) = x2 + a which has a local minimum at (0, a). Is it necessarily the case that y will have a turning point? If so, explain how you can tell. If not, explain why not. [4]