book Maths Puzzle Numerical Ability

rewrite -6(r+12) without parenthesis using the distributive

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book Other Question

The length of time it takes Brad to get to work varies inversely with his speed of travel. If it takes him 2.5 hours when traveling 15 miles per hour, how long does it take when traveling 50 miles per hour? line passes through (1,5)and(3,13)