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gayaneshka [121]
3 years ago
6

NEED HELP ASAP PLEASE HELP

Mathematics
2 answers:
Ivenika [448]3 years ago
8 0

Answer:

I think it's A

Step-by-step explanation:

I'm sorry if i'm wrong

Tresset [83]3 years ago
3 0

Answer: Choice C) 0.000042

4.2 \times 10^{-5} = 0.000042

There are four zeros between the decimal point and the 4.

==========================================

Explanation:

The exponent -5 means we move the decimal point five spaces to the left to go from 4.2 to 0.000042

If the exponent was positive 5, then we would move the decimal point five spaces to the right.

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Answer:

The total time it takes her to swim the four laps is 3.65 minutes.

Step-by-step explanation:

Here, according to the given data:

The time taken to complete 1st lap =  54.73 seconds

The time taken to complete 2nd lap =  54.56 seconds

The time taken to complete 3rd lap =  54.32 seconds

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Now, the TOTAL TIME taken to swim all 4 laps  = SUM OF ALL 4 TIMES

= (54.73  + 54.56 + 54.32 + 54.54) seconds

= 219.35 Seconds

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⇒219.35 seconds = 219.27 x (1/60) minutes = 3.6558  minutes

Hence, the total time it takes her to swim the four laps is 3.65 minutes.

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