A sample of a radioactive isotope had an initial mass of 550 mg in the year 2009 and decays exponentially over time. A measurement in the year 2015 found that the sample's mass had decayed to 90 mg. What would be the expected mass of the sample in the year 2020, to the nearest whole number?

stew reads at the fastest rate of 265 words per minute.

step-by-step explanation:

it's a given that felicia reads at 260 word per minute and on connie's graph we can see that she reads 200 words per minute. since stew's table tells us that he read 795 in 3 minutes, we can divide 795 by 3 to find out how many words he reads per minute.

795/3 = 265

stew reads 265 words per minute - he reads at the fastest rate since felecia reads at 260 words per minute and connie reads at 200 words per minute.

stew (265) > felecia (260) > connie (200)

my answer got deleted but it's a

step-by-step explanation:

what is the question?

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