Question

A production formula for a student's performance on a difficult English examination is given by g(t,...

A production formula for a student's performance on a difficult English examination is given by

g(t, x) = 3tx − 0.1t2 − x2,

where g is the grade the student can expect to get, t is the number of hours of study for the examination, and x is the student's grade-point average.

(a) Calculate

gt(10, 3)

and

gx(10, 3).

gt(10, 3) =
gx(10, 3) =



Interpret the results.

If you have studied for  hours and have a GPA of  , your score on the examination is increasing by  points for each additional hour of study and by  points for each additional point of GPA.


(b) What does the ratio

gt(10, 3)
gx(10, 3)

tell about the relative merits of study and grade-point average?

At a level of  hours of study with a GPA of  , one additional hour of study is equivalent to an increase of  (rounded to three decimal places) in GPA (as far as your test score is concerned).

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