exam Maths Puzzle Numerical Ability

Solve the system by substitution.
3x - y = -7
x + y = -9

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exam Other Question

Trees in urban areas help keep air fresh by absorbing carbon dioxide. A city has $2100 to spend on planting spruce and maple trees. The land available for planting is 45,000 ft2. H Simplify:

sqrt(x^2+18*x+81)

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