Grades 62 A productivity formula for a student’s performance on difficult English examination is g = 4 t x − 0.2 t 2 − 10 x 2 ( t < 30 ) , where g is the score the student can expect to obtain, t is the number of hours of study for the examination, and x is the student’s grade-point average. a. For how long should a student with a 3.0 grade-point average study to score 80 on the examination? b. Find d t d x fora student who earns a score of 80, evaluate it when x = 3.0 , andinterpret the result.
Grades 62 A productivity formula for a student’s performance on difficult English examination is g = 4 t x − 0.2 t 2 − 10 x 2 ( t < 30 ) , where g is the score the student can expect to obtain, t is the number of hours of study for the examination, and x is the student’s grade-point average. a. For how long should a student with a 3.0 grade-point average study to score 80 on the examination? b. Find d t d x fora student who earns a score of 80, evaluate it when x = 3.0 , andinterpret the result.
Solution Summary: The student with a 3.0 grade-point average takes underset_22.93 hours to score 80 in the examination.
Grades62 A productivity formula for a student’s performance on difficult English examination is
g
=
4
t
x
−
0.2
t
2
−
10
x
2
(
t
<
30
)
,
where g is the score the student can expect to obtain, t is the number of hours of study for the examination, and x is the student’s grade-point average.
a. For how long should a student with a 3.0 grade-point average study to score 80 on the examination?
b. Find
d
t
d
x
fora student who earns a score of 80, evaluate it when
x
=
3.0
,
andinterpret the result.
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