Use your brain. This should work.
Answer:
27 dimes
Step-by-step explanation:
2.70/.10=27
A quadratic function's graph being wide or narrow is determined or depended on a-term:

If |a| has a lot of value, for example a = 2 or a = 100. The graph will get narrower if increasing the value of |a|. On the other hand, If |a| has small value, for example a = 1/2 or a = 1/10000. The graph would be wide.
Also it does not matter if a-term is negative or not since a-term being positive or negative determines if a parabola is upward or downward. Only |a| determines how narrow/wide the graph is.
From the question, it is clear that the parabola y = 2x^2 is the narrowest graph since it has the highest |a| value out of all choices.
Answer
Answer:
x²-8x-84
Using quadratic Formular -b±√b²-4ac/2a
--8±/8²-4×1×-84 /2×1
8±/64+336/2
8±/400/2
8±20/2
8+20/2, 8-20/2
28/2, -12/2
14,-6