exam Maths Puzzle Numerical Ability

Question:
Find the domain and range of:
{(7,-2),(-6,-4),(-9,-9),(-5,-5),(6,6)}

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exam Other Question

Solve. X/8 = -1 in math class your average grade for the first three tests is 81. You want to raise your final average to 85. What grade do you need on the final, the only remaining test in the term?