16 Which set of ordered pairs represents a function?

(1) {(0,4), (2,4), (2,5)}
(3){(4,1), (6,2), (6,3), (5,0)}

(2) {(6,0), (5,0), (4,0)}
(4){(0,4), (1,4), (0,5), (1,5)}

17 A hiker walked 12.8 miles from 9:00 a.m. to noon. He
walked an additional 17.2 miles from 1:00 p.m. to 6:00 p.m. What
is his average rate for the entire walk, in miles per hour?

(1) 3.75 (3) 4.27

(2) 3.86 (4) 7.71

18 Which ordered pair is a solution of the system of
equations y = x + 3 and y = x^{2} − x?

(1) (6,9) (3) (3,−1)

(2) (3,6) (4) (2,5)

19 Which verbal expression can be represented by 2(x − 5)?

(1) 5 less than 2 times x

(2) 2 multiplied by x less than 5

(3) twice the difference of x and 5

(4) the product of 2 and x, decreased by 5

20 The dimensions of a rectangle are measured to be 12.2
inches by 11.8 inches. The actual dimensions are 12.3 inches by
11.9 inches. What is the relative error, to the nearest
ten-thousandth, in calculating the area of the rectangle?

(1) 0.0168 (3) 0.0165

(2) 0.0167 (4) 0.0164

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