exam Maths Puzzle Numerical Ability

If the probability that at least one person makes an A on the final exam is 0.15, what is the probability no one makes an A?

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exam Other Question

solve by completing the square
4x^2 + 2x - 3 = 0 Factor each polynomial completely:
8x3(x to the third) - 27
I tried, (4x +9)(2x-3) is that close
8x2(x squared) +-12x +-18x -27