exam Maths Puzzle Numerical Ability

find the range of the given function.

f(x)=-2x^2+7x+6

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exam Other Question

The diagonal of a rectangle is 2 ft longer than its length and 5 feet longer than its width. What are the dimensions of the rectangle? 18 out of 20 customers make a purchase. If three customers are selected randomly one at a time, what is the probability that all will make a purchase?

Please help.