The function p where p(x) = -x^2 + 14x - 40 can be used to model the profit from lindsey’s store in thousand of dollars after x months since opening the store

Part A

Based on the functions when did lindsey’s store have a profit of zero dollars
The store has $0 profit in the first month and then in month.

Part B
When did the store have its maximum profit and what was the profit

The maximum profit of $ occurred in month.

Please help 20 points