exam Maths Puzzle Numerical Ability

you are eating dinner at a restaurant. the restaurant offers 6 appetizers, 12 main dishes, 6 side orders and 8 desserts. if you can order one of each of these, how many different dinners can you order?

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Trigonometry Identities

Prove the identity is true


1/cosx - cosx = sinx tanx
These worded problems are killing me. Please assist me in making this a quadratic equation. Thank you.
It states:
Find the radius of a 12 cm high cylinder that has a surface area of 846cm^2.
Thank you so very much.