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AnnZ [28]
3 years ago
9

What is the average rate of change from x=-1 to x=-2? A. 2 B.-2 C.4 D.1

Mathematics
1 answer:
kogti [31]3 years ago
5 0
The answer should be B
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What are the measures of 1 and 2 multiple choice​
Bingel [31]

Im confused could you explain what the questions are better.

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3 years ago
Megan surveyed a random sample of 60 students at her school and found that 42 of them ride the bus to school each day. If there
Alisiya [41]
Do a ratio problem:
42/60=x/320
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3 years ago
Read 2 more answers
Please help me with #6 and 8! :((
Alika [10]

Answer:

6. D

Step-by-step explanation:

7 0
3 years ago
The mean waiting time at a drive-through of a fast-food restaurant from the time the order is received is 84 seconds. A manager
olga nikolaevna [1]

Answer:

t=\frac{81-84}{\frac{3.6}{\sqrt{100}}}=-8.33    

And the standard score for this case is -8.33

Step-by-step explanation:

Data given and notation  

\bar X=81 represent the sample mean

s=3.6 represent the sample standard deviation

n=100 sample size  

\mu_o =84 represent the value that we want to test

\alpha=0.05 represent the significance level for the hypothesis test.  

t would represent the statistic (variable of interest)  

p_v represent the p value for the test (variable of interest)  

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the ture mean is lower than 84, the system of hypothesis would be:  

Null hypothesis:\mu \geq 84  

Alternative hypothesis:\mu < 84  

If we analyze the size for the sample is > 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

t-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic

We can replace in formula (1) the info given like this:  

t=\frac{81-84}{\frac{3.6}{\sqrt{100}}}=-8.33    

And the standard score for this case is -8.33

5 0
2 years ago
I GIVE YOU BRAINLIEST!!!
Strike441 [17]
ANSWER:

I would say B

BRAINLIEST PLEASE
3 0
3 years ago
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