No he did not because 20% of 250 is 50 and there are 90 students not 50 students!! Hope this helped you a lot !!!
The answer is (0,-4),(1,0)
Ana would be farther from sea level because if you look at a number line and say 0 is the sea level Ana would be farther because -30 is farther away than -12.
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In plain and short, what value of "x" makes the expression |3x + 5| to 0?
well, we can check by simply setting it to 0 and solving for x.

notice, all you do is, get the x-value that makes the expression to 0, and then append the constant outside it as the y-value, and that's the vertex.