exam Maths Puzzle Numerical Ability

Find the slope of the graph of the linear function f.

f(6)=-1, f(3)=8

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exam Other Question

Solve by completing the square

3x^2 - 4x + 5 = 0 Colored copies cost $.10 per copy and white copies cost $.5 per copy. Sandy made 400 copies, some of which were colored and the rest white. Her total bill was $22.50. How many colored copies and how many white copies did she make?