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Basile [38]
2 years ago
9

Please help urgently ​

Mathematics
1 answer:
Minchanka [31]2 years ago
3 0

Answer:

-20

Step-by-step explanation:

Use the distributive property to get 2xy-14 (you multiply both xy and -7 by 2.) Now plug in the x and y values to get: 2(-1)(3)-14. This gets you -6-14 which is -20.

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Answer:

(12.1409, 14.0591

Step-by-step explanation:

Given that Tensile strength tests were performed on two different grades of aluminum spars used in manufacturing the wing of a commercial transport aircraft. From past experience with the spar manufacturing process and the testing procedure, the standard deviations of tensile strengths are assumed to be known.

Group   Group One     Group Two  

Mean 87.600 74.500

SD 1.000 1.500

SEM 0.316 0.433

N 10      12    

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