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VARVARA [1.3K]
1 year ago
12

Which expression is equivalent to 20 + 8y − 9y − 21

Mathematics
1 answer:
Sindrei [870]1 year ago
4 0

Answer:

-y-1

Step-by-step explanation:

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5

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Help me please asap ‘,:’
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3 years ago
Which equation of the least squares regression line most closely matches the data set?
Rudiy27

Answer: y = 3.5 x+ 43.8

Step-by-step explanation:

Here x represents the number of years after 1990

Thus, we get the table that is used to find the equation will be,

x             0                  2                4               6                8

y             45                51               57            61               75

Let the equation that shows the above data,

y = b + a x ---------(1)

\text{Where, }a=\frac{\sum y \sum x^2-\sum x \sum xy}{n(\sum x^2)-(\sum x)^2}

\text{And, }b = \frac{\sum xy - \sum x\sum y}{n\sum x^2 - (\sum x)^2}

By the above table,

\sum x = 20

\sum xy = 1296

\sum x^2 = 120

\sum y = 289

By substituting these values in the above value of a and b,

We get b = 43.8 and a = 3.5

Substitute this value in equation (1)

we get, the equation that shows the given data is,

y = 3.5 x + 43.8

⇒ Option (3) is correct.

4 0
3 years ago
Read 2 more answers
PLEASE HELP ME
yuradex [85]
The answer is C because it’s going back 5 times meaning it’s -5
8 0
2 years ago
Read 2 more answers
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