Part A: Kendall bought 6 nootbooks and 3 pens for a total of $27. The cost of one notebook is $1.50 more than the cost of one pen. What is the combined cost of one notebook and one pen?
Part B:
If Kendall wants to buy an equal number of notebooks and pens with $40, what is the maximum number she can buy?

What is the base of 1/9 to the power of 2

Can someone me out here number 4 plz

Needmax 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.