exam Maths Puzzle Numerical Ability

can yo help me solve this: An airplane was at a crusing altitude, then descended 3,500ft. If the airplane is at 28,500 now, what was the crusing altitude?

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exam Other Question

I drew the pentagon and not sure if I found all the triangles, I found 20 is this right or are there more. Heres the question. Thanks for your help.

Draw a pentagon with each of its five diagonals. How many triangles are contained in the figure? What is the solution for:

3y-2y-3 = -1
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6