I can't seem to find the ans to the question you posted and i think that you made a typo. after i modified it a little, it added up so i think this is the answer to your question
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5/12 = 0.4166666...
That is what it says on the calculator.
The temp after 15 minutes is 225 degrees because the initial temp plus the rate time the number of minutes gives the current temp. in this case, 75 + 10(15) = 225
therefore, the temp after t minutes can be represented by the equation f(x) = 10t + 75
A right triangle is a triangle that consist of an angle which one angle is 90degree and the remaining angle would be less than to 90 and the best answer to your question based on my calculation i think the answer is A.