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pishuonlain [190]
3 years ago
8

To make a dozen sugar cookies, you use .75 lb of cookie dough. To make a dozen frosted cookies, you

Mathematics
1 answer:
Fed [463]3 years ago
6 0
The Answer is C because you just have to
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The Department of Transportation would like to test the hypothesis that the average age of cars on the road is less than 12 year
puteri [66]

Answer:

z=\frac{10.6-12}{\frac{4.1}{\sqrt{45}}}=-2.29  

Step-by-step explanation:

information given

\bar X=10.6 represent the sample mean  

\sigma=4.1 represent the population standard deviation

n=45 sample size  

\mu_o =12 represent the value that we want to test  

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

z would represent the statistic

p_v represent the p value for the test

Hypothesis to test

We want to test if the true mean is less than 12, the system of hypothesis would be:  

Null hypothesis:\mu \geq 10  

Alternative hypothesis:\mu < 10  

The statistic is given by:

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

Replacing the info given we got:

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

z=\frac{10.6-12}{\frac{4.1}{\sqrt{45}}}=-2.29  

8 0
3 years ago
Help in math plzzddddddddddddddddd
melomori [17]

Answer:

first one: 3 1/3 = 7/3 second: 2 3/4 = 11/4

third one: 3 1/3 + 2 3/4 = 10/3 + 11/4 = 40/12 + 44/12

there fore the answer is: 84/12 or 7

this may help you the first one question only.

3 0
2 years ago
What is 17,210,000,000 written in scientific notation? Enter your answer in the box.
Leni [432]
That's easy 172.1 times 10 with the exponent of 7
.
6 0
3 years ago
Which expression is equivalent to (7x – 5) – (3x - 2)
Nastasia [14]

Answer:

D

Step-by-step explanation:

We have the expression

(7x-5)-(3x-2)

First we need to distribute the negative throughout the parenthesis. Then we can combine like terms in order to simplify this expression

(7x-5)-(3x-2)\\\\7x-5-3x+2\\\\4x-3

This answer matches D.

3 0
3 years ago
Jenny’s favorite store pays $45 for a new type of spring dress. The store’s percent of markup is 75%. After the markup, how much
nydimaria [60]

Answer:

78.75

Step-by-step explanation:

75% of 45 is  33.75

45+33.75 = 78.75

6 0
3 years ago
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