25 percent of 60 students in a class failed in the test. how many students failed the test
2 answers:
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Answer:
or
Step-by-step explanation:
The given equation is
Let us treat this as a quadratic equation in .
where
The solution is given by the quadratic formula;
We substitute these values into the formula to obtain;
or
or
or
or
we know that
For a spherical planet of radius r, the volume V and the surface area SA is equal to
The
ratio of these two quantities may be written as
we know
therefore
the answer is