exam Maths Puzzle Numerical Ability

Determine the length of the altitude from vertex A for the triangle with vertices at A(7,-1), B(-2,8) and C(-3,-3).

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exam Other Question

Using one of the laws of exponents, prove that any number raised to the power 0 is 1. The sum of two numbers is 50 and their difference is 18. Find the numbers.

Im so confused could someone please help?