exam Maths Puzzle Numerical Ability

how would you solve this problem algebracily??

the vectors [8,0] and [3,4] form a parallelogram. find the lengths of its altitudes.

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exam Other Question

Solve each of the following systems by using either addition or substitution (kind of like in Example 5 on p 715). If a unique solution does not exist, state whether the syste Simplify:

sec^2t-1/sec^2t