One millilitre has about 15 drops. One drop of water has 1.67 x 1021 H, O (water) molecules.
Estimate the number of molecules in 1 litre of
water. Write down your answer in standard
form.

Three coins are flipped. what is the probability that there will be at least two tails?

Now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0