exam Maths Puzzle Numerical Ability

Hi. Can I have some help with the following problem?
An appliance dealer advertises a 15% discount on all his washing machines. In addition, the manufacturer offers a $80 rebate o

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Find the MINIMUM VALUE of Y if: Y = x^2 - 8x + 9 A sailboat travels 20 miles downstream in 3 hours. It returns in 4 hours. Find the speed of the sailboat in still water and the rate of the current. (using the 5- step method )