Find the domain of the expression: -((18a^2b^2)/(5cd))/-((9ab^3)/(5c^2 d^4))
I can't seem to get it right, I've already tried a, b, c, and d not equal to 0 and it is still not right.

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

Cor d? ? me ? 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.

Drag each equation to the correct location on the table. for each equation, determine the number of solutions and place on the appropriate field in the table.