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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How can I Find the slope of the line passing through the points (-2, 1) and (3, 9). and show in a graph? thank you in advance for your help PLEASE HELP ME WITH THIS!!
IF THE LENGTH OF THE SIDE OF A SQUARE IS INCREASED BY 6 UNITS, THE AREA IS MULTIPLIED BY 4. FIND THE ORIGINAL LENGTH.