book Maths Puzzle Numerical Ability

The polynomial function L(p) = p^3 - 5p^2 + 20 gives the rate of gas leakage from a tank as pressure increases p units from its initial setting. Will an increase of 4 units result

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The Denver Broncos' quarterback was sacked and lost 20 yards on the first down. On the second down, a 25 yard pass was completed. On the third, the broncos rushed for 6 yards. Did find the midpoint and length (to the nearest hundredreth) of the line segment between the points P sub 1 (4,6) and P sub 2 (-2, 1)