Samantha and Luis are attempting to determine the average number of library books that seventh-grade students check out at one t
2 answers:
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Use the fact that for non-negative
.
and
, which means the square root of some number between 81 and 100 has an approximate value of 9.2371.
A sideways opening parabola is in the form 
, so we know from the process of elimination that it will either be b or c. Next we have to realize that if the parabola opens to the left it is a negative parabola, just like if a parabola opens upside down it is a negative parabola. So the one that has the negative out front is b.