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Alisiya [41]
3 years ago
10

HELP

Mathematics
2 answers:
alina1380 [7]3 years ago
3 0

Answer:

D

Step-by-step explanation:

72+21-11=82

82-67=15

Mandarinka [93]3 years ago
3 0

Answer:

The Correct Answer is option D.

Step-by-step explanation:

Tina observed that the temperature was 72 degrees. Later the temperature rose 21 degrees and then dropped 11 degrees.

 

That is, 72+21-11=82.

 

She then flew to New York where the temperature was 67 degrees.

 

The change in temperature from when Tina left Atlanta and arrived in New York is,

82-67=15.

 

Hence, the change in temperature is 15.

 

Thus, the correct option is D.

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Nutka1998 [239]

Answer:

The null hypothesis   H_o :  \mu =  31

The alternative hypothesis H_a :  \mu >  31

Step-by-step explanation:

From the question we are told that

  The population mean is  \mu =  31 \  miles / gallon

Generally

   The null hypothesis is that the company's  new sedan, the Libra, will have an average of   \mu =  31 \  miles / gallon

This mathematically  represented as

The null hypothesis   H_o :  \mu =  31

   The alternative hypothesis is that the company's  new sedan, the Libra, will have an average better than   \mu =  31 \  miles / gallon

This mathematically  represented as

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7 0
3 years ago
4. What is 54 + (-78) - (-39)
inysia [295]

Answer:

Step-by-step explanation:

follow the Pemdas order of operations

add and subtract (left to right)

apply the rule +(-a)=-a

+(-78)=-78

=54-78-(-39)

54-78=-24

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apply the rule -(-a)=+a

-(-39) =+39

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Please help me :(.....
monitta

Answer:

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