exam Maths Puzzle Numerical Ability

8d - (-7c - 2d)

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need help could u explain each step thanks

2x-y=6
x=13-2y equations by substitution

thank you so much homework This is a worksheet problem.
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Suppose the angle of elevation to the top of a tree is 50 degrees. If you are standing 35 feet away from the tree, how tall is the tree?

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