Which set of ordered pairs does not represent a function?
a) (0, 1), (2, 2), (4, 8), (-2, 7), (5, 8)

b) (0, 1), (2, 2), (4, 8), (2, 7), (5, 8), (7, 9)

c) (-3, 6), (2, 7), (0, 5), (1, 5), (4, 9), (5, 4)

d) (-4, 2), (-3, 2), (-2, 2), (-1, 2), (0, 2), (1, 2)

Which linear equations have an infinite number of solutions? check all that apply.  (x  –  3/7)  =  2/7(3/2x  –  9/14)8(x  +  2)  =  5x  –  1412.3x  –  18  =  3(–6  +  4.1x)(6x  +  10)  =  7(x  –  2)4.2x  –  3.5  =  2.1 (5x  +  8)

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.

Factor the polynomial. b^2 + 4b + 4