Me -original gas price : $ 1.25/gal the new gas price : $ 1.75/gal, find the percent of increase

How do you find principle and simple interest

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

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.