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zmey [24]
3 years ago
12

Please! #12, Thank you so much!

Mathematics
2 answers:
Ira Lisetskai [31]3 years ago
5 0
I think it will cost $1.260 sorry if i'm rong
vovikov84 [41]3 years ago
4 0
A. 168 feet
b. 1 yard = 3 feet
168*3=504 so, 168 feet =504 yards
c. 504 yards*$15=7560
d. $7560
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a study timed left-handed and right-handed people to see how long it took them to hit a buzzer. the data is shown below: the six
Effectus [21]

The z or t score to be used is  (0.422,0.978)

How to find the critical value ?

Critical probability (p*) = 1 - (Alpha / 2), where Alpha is equal to 1 - (the confidence level / 100), is the unit statisticians use to determine the margin of error within a set of data in statistics.

The critical value for α = 0.13 is z_{c} = \frac{z_{1} - \alpha }{2}

The corresponding confidence interval is computed as shown below

CI = (X1_{1}  - X_{2}- z_{c} \sqrt{\frac{a_{1}^{2}}{n_{1} } + \frac{a_{2}^{2}}{n_{2} }}  ,  X1_{1}  - X_{2}+z_{c} \sqrt{\frac{a_{1}^{2}}{n_{1} } + \frac{a_{2}^{2}}{n_{2} }}  )

CI = (2.1 - 1.4- 1.514\sqrt{\frac{1^{2}}{37 } + \frac{0.5_{2}^{2}}{38 }}  ,  2.1  - 1.4 + 1.514 \sqrt{\frac{1^{2}}{37 } + \frac{0.5^{2}}{38 }}  )

CI = (0.422, 0.978)

0.422< mu1 - mu 2 < 0.978

To learn more about finding the critical value from the given link  

brainly.com/question/14040224

#SPJ4

8 0
1 year ago
Solve the equation.<br><br> 5x – 7 = 3x – 9<br><br><br> –2<br><br> 2<br><br> –1<br><br> 0
irga5000 [103]

Answer:

x= -1

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
How to solve 0.5x +78.2 =287
Inessa [10]
You can subtract 78.2 from 287 to get the x value alone. Your new expression will look like this:
.5x=208.8
Next you divide by .5 (or multiply the reciprocal 1/.5 depending on how you were taught)
x=417.6

Hope that helps!!
8 0
2 years ago
Read 2 more answers
A store orders 22 boxes of light bulbs. Each box has 148 bulbs.
Schach [20]

Answer:

3,256bulbs

Step-by-step explanation:

From the question, we can see that;

Total number of boxes ordered = 22boxes

If each box contains 148 bulbs, then;

1 box = 148bulbs

To get the total bulbs we have we will say;

22boxes = x bulbs

solve this two expressions for x:

1box = 148bulbs

22boxes = x bulbs

Cross multiply

1×x = 22×148

x = 3256bulbs

Hence the best estimate of the total number of bulbs the store orders is 3,256bulbs

5 0
2 years ago
Read 2 more answers
What is the sum of the polynomials? (8x2-9y2-4x)+(x2-3y2-7x)
White raven [17]
The sum of the polynomials (8x²-9y²-4x)+(x²-3y²<span>-7x) is:

 1. You must add the terms whose variables and exponents are the same. 
 2. Let's rewrite the polynomials:
</span>
 (8x²-9y²-4x)+(x²-3y²-7x)
 8x²-9y²-4x+x²-3y²-7x
 (8+1)x²+(-4-7)x+(-9-3)y²

 3. Therefore, the result is:

 9x²-11x-12y²

 3. <span>What is the sum of the polynomials?

 The answer is: </span>9x²-11x-12y²
3 0
3 years ago
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