Correct answers only !
mark has the following averages in his amdm math class:
homework: 95
quiz average: 80
test average: 67
final exam: 60
if the teachers weights homework at 10%, quizzes at 20%, tests at 50%, and final exam at 20%, what is marks class average?
a. 61%
b. 71%
c. 74%
d. 82%

B.71%

Step-by-step explanation:

Weighted Mean is (All X * W)/sum of W

X for averages and w for weight

           X        W        (X*W)

HW     95      10          980

Quiz    80      20        1600

Test     67      50        3350

Final    60     20          1200

Total               100       7100

Weighted Mean = 7100/100 = 71%

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629