A relation contains the points (1,2), (2,-1), (3,0), (4,1) and (5,-1). Which statement accurately describes this relation? The relation does not represent y as a function of x, because each value of x is associated with a single value of y.
The relation does not represent y as a function of x, because each value of x is associated with a single value of y.

The relation represents y as a function of x, because one value of y is associated with two values of x.
The relation represents y as a function of x, because one value of y is associated with two values of x.

i believe it is 40–40–20%

explanation:

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

i think it is true since you can test the answer and can use observations to complete it.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.