When the input to a function is -2,the output is 4. Which statement about this function must be true?

A. an input of -2 has infinitely many possible outputs.
B. an input of -2 has exactly one possible output.
C. an output of 4 has infinitely many inputs.
D. an output of 4 has exactly one input.

What percent of the circle below is shaded?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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.