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ASHA 777 [7]
3 years ago
8

What are the coefficients in this expression? 2x +9y+(-4) Select all that apply.

Mathematics
2 answers:
Oksi-84 [34.3K]3 years ago
7 0

Answer: A and B

Step-by-step explanation:

Coefficient is the number or term that came before a variable.

If you can't understand this, I will provide some examples.

  • Coefficient in 3x is 3, 3 came before x which is a variable

-------------------------------------------------------------------

2x + 9y + (-4)

2x: coefficient is 2

9y: coefficient is 9

-4: no coefficient, it is just a constant

zalisa [80]3 years ago
6 0
A) 2 and B) 9
Coefficients are the numbers in front of a variable. The x and y wouldn’t be considered coefficients.
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Answer:

Step-by-step explanation:

This is a test of 2 independent groups. The population standard deviations are not known. it is a two-tailed test. Let m be the subscript for the number of English courses taken by male students and f be the subscript for the number of English courses taken by female students.

Therefore, the population means would be μm and μf.

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We would set up the hypothesis.

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The alternative hypothesis is

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Since sample standard deviation is known, we would determine the test statistic by using the t test. The formula is

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From the information given,

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sf = 1

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The formula for determining the degree of freedom is

df = [sm²/nm + sf²/nf]²/(1/nm - 1)(sm²/nm)² + (1/nf - 1)(sf²/nf)²

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We would determine the probability value from the t test calculator. It becomes

p value = 0.00001

Assuming a level of significance of 0.05, we would reject the null hypothesis because the p value, 0.00001 is < 0.05

Therefore, we can conclude that the means are not statistically the same.

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