**PLATO QUESTION, PLEASE ANSWER CORRECTLY**
Instructions: Select the correct answer from each drop-down menu.
This graph compares growth measures and emissions between 1980 and 2014.
The graph labeled __ shows that pollution control methods are having a positive effect in the United States. The proof is trend ___ in this graph, with the percentage drop over this period reaching ___%.
First blank options:
A. aggregate emissions
B. energy consumption
C. population
D. vehicle miles traveled
Second blank options:
A. a decreasing
B. an increasing
C. an unchanging
Third blank options:
A. -63
B. 0
C. 17
D. 147

In a laboratory determination of the atomic weight of tin, a sample of tin is weighed in a crucible. nitric acid is added, and the reaction proceeds to give a hydrated tin(iv)oxide plus no2and h2o. the hydrated tin(iv)oxide is then heated strongly and reacts as follows: sno2.xh2o(s)sno2(s)+ xh2o(g)the sno2is finally cooled and weighed in the crucible. explain the effect on the calculated atomic weight of tin that would result from each of the following experimental errors: (a)considerable spattering occurs when the nitric acid is added to the tin.(b)the hydrated tin(iv)oxide is not heated sufficiently to change it completely to tin oxide.