An express train travels 90 kilometers per hour from smallville to megatown. a local train takes 2.5 hours longer to travel the same distance at 50 kilometers per hour. how far apart are smallville and megatown?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Someone answer asap for ! 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.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota