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just olya [345]
3 years ago
5

A one-celled organism measures 32 mm in length in a photograph. If the photo has been enlarged by a factor of 100, what is the a

ctual length of the organism?
Mathematics
2 answers:
larisa86 [58]3 years ago
5 0

32 mm = length × 100

(32 mm)/100 = length . . . . . divide both sides by 100

0.32 mm = length

The actual length of the organism is 0.32 mm.

Colt1911 [192]3 years ago
3 0

Let L be the actual length.  Then 100 L = 32 mm, and so L = 3 1/8 mm or 3.125 mm.

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Answer:

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The sum can be broken into parts that you know. Here, one of those parts is the sum of numbers 1 to n. That sum is given by n(n+1)/2.

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Another way to do this is to realize the sequence of numbers is an arithmetic sequence with a first term of 65 and a last term of 67-2·75 = -83.

The sum of an arithmetic sequence is found by multiplying the number of terms by their average value. Their average value is the average of the first and last terms.

The average value of those 75 terms is (65 +(-83))/2 = -9, so their sum is ...

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