A function, f(x), models the depth of water in a wading pool that is filling at arate of 11 gallons per minute. Which of these describes why f(x)can be considered a linear function? I. For every 1 minute interval, the depth of water in the wading pool
increases by the same amount.
II. The function grows by equal factors every minute.
III. The slope of the function is constant.
I only
I and III only
II and III only
I, II, and III

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Is the point (0, 8) on the x-axis or y-axis? how do you know?

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above