The number of calories in a serving of oatmeal is proportional to the size of the serving. Suppose there are 160 calories in a 40 gram of serving. Write an equation that models the relationship between the number of calories "c" and the size "s" of a serving of oatmeal.

Louise measured the perimeter of her rectangular scrapbook to be 154 cm. if the scrapbook is 45 cm wide, how long is the scrapbook?

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.

3x + 4y = 5 x- 3y = -7 solve by substitution