PLEASE HELP!!!! 30 POINTS!!

Mathematics

1 answer:

Neporo4naja [7]3 years ago

8 0

Answer:

1. x=7 y= -1

2. x= -1 y= -4

3. x= 1 y= 1

4. x= 2 y= -1

Step-by-step explanation:

To solve these problems I used substitution. Hopefully this was helpful!:)

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Answer:

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The first thing you must do is to calculate the weight of the gravel (w) that the truck holds (7.5 yards³). So, you have:

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H<span>ow many containers of this size are needed to hold all the gravel from one truck?
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3 years ago

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Answer:
For a sample size of 10, the t-value is about 3.25 (from tables) at a 99% confidence interval.

Explanation:
When the standard deviation for the population is not known, the confidence interval estimate for the population mean is performed with the Student's t-distribution.
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When reading the t-value, (n-1) is called the df or degrees of freedom.

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