The perimeter of a rectangular slab of concrete is 24 meters. if the length of the
rectangular slab is 2 meters longer than its width, what is the width of the slab?
answers:
a) 5 meters
b) 6 meters
c) 7 meters
d) 8 meters
the answer is 5 meters but i don't know how to get that.

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.

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)