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

Find the equation of the line that passes through the point (7,-2) and is parallel to the line that passes through (-2,-2) and (3,3) A=1/2bh
Solve for h.