EXPAND-x^{2} +-8x+-7x+56
SIMPLIFY- x^{2} +15x+56
We assume that
.. (number in school)/(560 lunches sold) = (60 students sampled)/(40 eat lunch)
Then
.. (number in school) = 560*60/40 = 840
Answer:36.36%
Step-by-step explanation:
%change=100 X (final-inital value) divided by initial