Answer:
a. 47
b. 87
c. 127
Step-by-step explanation:
Assume a total of 4 exams ( first 3 plus a final)
Let final score be X,
Hence, average score = (85 + 71 + 77 + x) / 4 = (233 + x) / 4
a) to get a C, the average score must be 70
70 = (233 + x) / 4
(233 + x) = 70 (4) = 280
x = 280 - 233 = 47 (Ans)
b) to get a B, the average score must be 80
80 = (233 + x) / 4
(233 + x) = 80 (4) = 320
x = 320 - 233 = 87 (Ans)
c) to get a A, the average score must be 90
90 = (233 + x) / 4
(233 + x) = 90 (4) = 360
x = 360 - 233 = 127 (Ans)
123/0.75 =164
the answer is 164
To raise 4x/y to a power, raise the numerator and denominator to the power, and then divide.
Expand (4x)².
Calculates 4 to the power of 2 and gets 16.
No, because
60/3 = 20
90/6= 15
Both of the answers aren’t equivalent.
I think you are missing part of the problem. If you had another equation or a value for x you could solve it.
