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MrRissso [65]
3 years ago
14

Add the followinf expresionb. x- 3y + 4z , y – 2x- 8z ,5x – 2y – 3z ​

Mathematics
1 answer:
Mariana [72]3 years ago
3 0

Answer:

4x - 4y - 7z

Step-by-step explanation:

x - 3y + 4z + y - 2x - 8z + 5x - 2y - 3z =

(x - 2x + 5x) + (y - 3y - 2y) + (4z - 8z - 3z) =

4x + (- 4y) + (-7z) =

4x - 4y - 7z <===

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What is the value of 2(5b - 7) in terms of y if b = 3y ?
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2(5b-7), you can input b as 3y
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5 0
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3 years ago
Test the claim that the proportion of people who own cats is significantly different than 80% at the 0.2 significance level. The
sattari [20]

Answer:

C. H0 : p = 0.8 H 1 : p ≠ 0.8

The test is:_____.

c. two-tailed

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Based on this we:_____.

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Step-by-step explanation:

We formulate null and alternative hypotheses as  proportion of people who own cats is significantly different than 80%.

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We have alpha equal to 0.2  for a two tailed test . We divided alpha with 2 to get the answer for a two tailed test. When divided by two it gives 0.1 and the corresponding value is ± 1.28

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n= 200

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0.8362, 0.7638

As the calculated value of z lies within the critical region  we reject the null hypothesis.

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3 years ago
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3 years ago
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