Mathematics: Use the Distributive Property to expand 8(2x - 5y) - 7.

Use the Distributive Property to expand 8(2x - 5y)

Ответ:

bella7524

12.02.2021

Mathematics

8(2x) - 8(5y) - 7

Step-by-step explanation:

To check if you've distributed properly:

8(2x) - 8(5y) = 16x - 40y,

8(2x - 5y) = 16x - 40y

8(2x) - 8(5y) = 8(2x - 5y)

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Ответ:

charlzperru8234

08.06.2022

Mathematics

The weighted mean grade is 78.62

Step-by-step explanation:

We are given the following in the question:

Regular exam score = 79, 74, and 73

Weightage of regular exam = 12%

Final exam grade = 66

Weightage of final exams = 17%

Course project grade = 88

Weightage of project = 10%

Homework grade = 93

Weightage of homework = 37%

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

Mean of regular exam scores =

$Mean =\displaystyle\frac{226}{3} = 75.33$

Weighted mean grade

$w = \dfrac{\sum wx}{\sum w}$

$\displaystyle\sum wx =\displaystyle\frac{12}{100}\times 75.33 + \frac{17}{100}\times 66 + \frac{10}{100}\times 88 + \frac{33}{100}\times 93\\\\\displaystyle\sum wx = 59.75\\\\\sum w = 0.12 + 0.17 + 0.10 + 0.37 = 0.76\\\\w = \frac{59.75}{0.76} = 78.62$

The weighted mean grade is 78.62

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Use the Distributive Property to expand 8(2x - 5y) - 7.

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