Narrowing it down it's either a or c because the other 2 choices open downward (negative a).
Graphing the 2 parabolas choice c is narrower.
c
The first option is

The second option is

So, neither of them is equivalent to 
3x to the third=180
third root 3x to the third =third root180
Answer:
There are infinite fractions greater then -7/12. An example is 7/8.
A divided by B produces a decimal fraction. The percentage is found by mult. this decimal fraction by 100%. So the correct aswer is C.