How long will it take to earn $252 in interest if $1200 is invested at a 7% annual interest rate?

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.

With number 11 ( show how you got the answer)

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle