please help me with all five questions. it would be greatly appreciated. thank you so so much

1. For each function, state whether the function will have a maximum or a minimum value. Calculate the maximum or minimum value, and the value of x where the optimal value occurs. (7 marks ) 3a) y =-2( x + 6)2 + 21 ,b) f(x) = 2x - 8x +4 2. The profit function for a new product is given by P(x) - -4x' + 28x - 40, where x is the number sold , in thousands. How many items must be sold for the company to break even? (4 marks) 3. A bus company has 4000 passengers daily, each paying a fare of $2. For each $0.15 increase, the company estimates that it will lose 40 passengers per day. (8 marks) sa) For maximum profit, how many increases to fare should be made? ,b) If the company needs to take in $10450 per day to stay in business, what fare should be charged? 4. Determine the point(s) of intersection of the linear function g(x) = -3x + 4 and the quadratic function f (x) = 2x2 + 4x - 11. (5 marks) Thinking ( / 11 marks) 5. Jackie mows a strip of uniform width around her 25m by 15m rectangular lawn and leaves a patch of lawn that is 60% of the original area. What is the width of the strip? ( 6 marks)