exam Maths Puzzle Numerical Ability

Factor completely:
2x3 - 26x2 + 80x

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exam Other Question

help....

KAren left her house heading east and her sister left two hours later heading west at a rate of 5 mph faster than Karen. Six hours after Karen left, she and her sister were 600 miles apart. How fast was Karen moving?
If the quotient of three times a number and five is increased by four, the result is 34. Find the number.
This problem was on a work sheet, but I believe it is in chapter 1