I got a question related to sound echo. A car driving at a constant speed of 25 m s heads straight to a mountain. The driver presses the horn and hears an echo 3. 6sec later. Calculate the distance between car and mount. (Take speed of sound 300 m s).

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Now 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.

Find the nonpermissible replacement for binthis expression.b2/5b +5