exam Maths Puzzle Numerical Ability

Find the slope of a line that is perpendicular to the line connecting the points (6, 12) and (3, 5).

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exam Other Question

How many gallons of 32% solution must be mixed with 70 gallons of 47% solution to obtain a 42% solution? need help
Reduce (64y^3+27z^3)/(4y+3y) to lowest terms

choices are 16y^2+12yz-9z^2
4y+3z
16y^2-12yz+9z^2
already in lowest terms