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mixas84 [53]
4 years ago
13

Sarah starts at one corner of a square field and walks 60 feet along one side to another corner of the field. She turns 90° and

walks 40 feet, and then walks straight back to where she started. What is the area of the part of the field she walked around? A. 100 ft² B. 240 ft² C. 1200 ft² D. 2400 ft²
Mathematics
2 answers:
forsale [732]4 years ago
7 0
All you do is multiply 60 * 40 = 2400 ft squared.  you find area of a square by multiplying base * length.  SO the answer is "D"
Inessa05 [86]4 years ago
5 0
D.2400 ft squared. It's length time width. 60x40
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Answer:

A 95% confidence interval for the true mean minimum temperature that will damage an iPod is between 2.55°F and 7.45°F

Test statistic(Z) = 2.31

P-value = 0.0104

Step-by-step explanation:

Step 1

Null hypothesis: The average damaging temperature of nine iPods is 5°F

Alternate hypothesis: The average damaging temperature of nine iPods differs from 5°F

Step 2

Mean=5°F, Sd=3, df=n-1=9-1=8

The t-value corresponding to 8 degrees of freedom and 95% confidence level (5% significance level) is 2.306

Confidence Interval(CI) = (mean + or - t×sd/√n)

CI = (5 + 2.306×3/√8) = 5 + 6.918/2.828= 5+2.45=7.45°F

CI = (5 - 2.306×3/√8) = 5-2.45 = 2.55°F

Z = (sample mean - population mean)/(sd÷√n) = (5-2.55)/(3÷√8) = 2.45/1.061 = 2.31

Step 3

Using the standard distribution table, the cumulative area to the left of Z = 2.31 is 0.9896

P-value = 1 - 0.9896 = 0.0104

Step 4

Conclusion: A 95% confidence interval for the true mean minimum temperature that will damage an iPod is between 2.55°F and 7.45°F

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