exam Maths Puzzle Numerical Ability

Find the slope of the line through the following pairs of points. See Examples 1, 2, 3, 4 and 5 in the text (pp 549-553).

(-5, -3) and (-5, 2)

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exam Other Question

When x number of units are sold, the price of each unit (in
dollars) is given by P = -x/2 + 75. Find the unit price when the following quantities are sold: 2, 7, 9, 11. Convert 3.4 to a percent.
No clue how to do this, please help.