exam
Maths Puzzle
Numerical Ability
Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n
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exam Other Question
With Current, a motorboat travels 60 mi in 3 h. Against the current, it takes 2h longer to travel 60 mi. Find the rate of the current.
solve by graphing.
y = -2x + 3
x + 3y = -6
x = 3 ??