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Maths Puzzle
Numerical Ability
Kevin earned $165 interest for 1 year on an investment of $1500. At the same rate, what amount of interest would be earned by an investment of $2500?
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Are these the right steps to get the standard form to the vertex form
f(x) = ax^2 + bx + c
f(x) = a (x^2 + b/a) + c
f(x) = a (x^2 + b/a + b^2/4a) + (c - b^2/4a)
f(x) = a (x +
A boat can travel on a river 7 miles upstream in the same time it takes to travel 9 miles downstream. Find the speed of the current if the speed of the boat in still water is 8 miles per hour.