Which relation is a function? A:{(1, 1), (2, 4), (4,8), (8, 16),
(8,32)}
B: (8, -2) , ( 9, -2) , (10, -2) (11, -2), (12,3)
C: (2,-3), (2,-2), (2,-1), (2,0), (2,1)
D: (9,3) , (9,-3), (16,-4), (25,-5)

1,2,4,8,16,32,36,40,48

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

55.44 inches

step-by-step explanation:

part a. assuming a perfectly linear relationship, we can find the slope from the first two data points.

slope = m = (change in rainfall)/(change in years)

= (61.80 -62.33)/(2005 -2004) = -0.53/1 = -0.53

then the point-slope form of the equation of the line can be written as

y = m(x -h) +k . . . . . m = -0.53, (h, k) = (0, 62.33)

y = -0.53x +62.33 . . . x = years after 2004

part b. in 2017, x = 2017 -2004 = 13. then the predicted rainfall is

y = -0.53·13 +62.33 = 55.44 . . inches

the predicted rainfall in 2017 is 55.44 in.