Amy knows from reading her syllabus in intermediate algebra that the average of her chapter tests accounts for 80 % ( 0.8 ) of her overall course grade. She also knows that the final exam counts as 20 % ( 0.2 ) of her grade. Suppose that the average of Amy’s chapter tests is 92%. a. Determine the range of grades that she would need on her final exam to get an “A” in the class. (Assume that a grade of “A” is obtained if Amy’s overall average is 90% or better.) b. Determine the range of grades that Amy would need on her final exam to get a “B” in the class. (Assume that a grade of “B” is obtained if Amy’s overall average is at least 80% but less than 90%.)
Amy knows from reading her syllabus in intermediate algebra that the average of her chapter tests accounts for 80 % ( 0.8 ) of her overall course grade. She also knows that the final exam counts as 20 % ( 0.2 ) of her grade. Suppose that the average of Amy’s chapter tests is 92%. a. Determine the range of grades that she would need on her final exam to get an “A” in the class. (Assume that a grade of “A” is obtained if Amy’s overall average is 90% or better.) b. Determine the range of grades that Amy would need on her final exam to get a “B” in the class. (Assume that a grade of “B” is obtained if Amy’s overall average is at least 80% but less than 90%.)
Solution Summary: The author calculates the range of marks that Amy needs to score in her final exam to get an A grade.
Amy knows from reading her syllabus in intermediate algebra that the average of her chapter tests accounts for
80
%
(
0.8
)
of her overall course grade. She also knows that the final exam counts as
20
%
(
0.2
)
of her grade. Suppose that the average of Amy’s chapter tests is 92%.
a. Determine the range of grades that she would need on her final exam to get an “A” in the class. (Assume that a grade of “A” is obtained if Amy’s overall average is 90% or better.)
b. Determine the range of grades that Amy would need on her final exam to get a “B” in the class. (Assume that a grade of “B” is obtained if Amy’s overall average is at least 80% but less than 90%.)
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Determine if the values of the variables listed are solutions of the system of equations.
2x - y = 4
3x+5y= - 6
x=1, y = 2; (1,-2)
Is (1, 2) a solution of the system of equations?
L
No
Yes
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10. A sound wave's amplitude can be modeled by the function y = −7 sin ((x-1) + 4). Within the interval 0 < x < 12, when does the function have an amplitude
of 4? (Select all that apply.)
9.522 seconds
4.199 seconds
0.522 seconds
1.199 seconds
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