The 60 second challenge involves adding numbers using theses rules:
• start with 0 points
• for every prime-numbered second, add 5 to your points total.
• for every second that is a factor of 60, add 2 to your points total
what should your points total be after 60 seconds?
show your workings.

Can someone explain the elimination method to me for this problem?

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.

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.