Calculus Answers

What is answer of 1336? you do minus, multiply, anything.
I knows the answer is 17 but how?

An aeroplane can carry a max of 200 passengers. Baggage for a first class ticketis 20kg. Max capacity for the baggage is 4500kg. The profit on each first clas ticket is rs 500 & on each economic clas ticket is rs 300. Determine how many tickets of each type must be sold to maximize the profit of the airline.

please explain with all steps!
Thank you

1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1

1)tan^2(4)θ-sec^2(4)θ
2)4tan^2θ-4sec^2θ
3)5 sin^2 (θ/4) +5cos^2 (θ/4)

Please show steps

find the magnitude and direction of the vector product of two vectors of 10 units each, which are inclined at 30 degrees to each other.

derivative of x^lnx