Which set of ordered pairs does not represent a function?

a. {(-9, -3), (-4, -2), (-1, -1), (-1, 1)}

b. the set of the ordered pairs eight comma negative three, five comma negative one, two comma one, and negative one comma three.

c. the set of the ordered pairs thirty-three comma twenty-two, twenty-two comma eleven, eleven comma zero, and negative eleven comma negative twenty-two.

d. the set of the ordered pairs fifteen comma five, twenty comma four, twenty-five comma three, and thirty comma two.

Which fraction is not equivalent to 8/12 a. 2/3 b. 24/36 c. 4/10 d. 6/10

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.