The common cold virus has a diameter of about 0.000000028 of a meter. express this in scientific notation.

So scientific notation is bring a number to it's last digit that's greater then zero, meaning for example 0.0000045→4.5 and multiplying it by a power of 10 to get a condensed version of the original number.  

So in this case you'd get 2.8*10^-8

answer: city needs 2.4 inches of rainfall more to match the record of 40 inches.

step-by-step explanation:

since we have given that

total annual rainfall a city record = 40 inches

this year, total rainfall recorded = 37.6 inches

number of inches of rainfall   is needed to match the record of 40 inches is given by

hence, city needs 2.4 inches of rainfall more to match the record of 40 inches.

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step-by-step explanatio89