exam Maths Puzzle Numerical Ability

The density of copper is 8.92 g/cm3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?

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exam Other Question

Factor the polynomial completely. If the polynomial cannot be factored, choose prime.

x^2 - x - 6 Please help me---I am not sure how to setup this problem in order to solve it.
Problem: Find the greatest possible pair of numbers such that one integer is 5 more than twice the other and the sum is less than 30.