exam Maths Puzzle Numerical Ability

How do you factor r5k2-27k-7 ?

the 2 is an exponent

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exam Other Question

find the slope of the line containing the following

1)(-1,6)and(0,3)
2)(12,-1)and(34,2)
3)(6,6)and(7,4)

THANKS A LOT VERY MUCH !!!!!!!! A 35% alcohol solution is to be made by mixing 2 liters of 8% solution with pure alcohol. How much pure alcohol is required? Create a table with headings that include units, show equation, solve and include units in your answer.

Please help!