Question

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Answer 1

what are your answer options by chance

Answer 2

Step 1) convert all the percentages to decimal form

Step 2) multiply those decimal forms with the corresponding mass

Step 3) add up the products from step 2

Answer 3

it looks like you have the correct steps, but the wrong final answer

Answer 4

here is the same question someone else answering I not there yet
http://openstudy.com/study#/updates/505a6b83e4b0cc122893b4c6

Answer 5

yes, what calculator did you use?

Answer 6

I got that too

Answer 7

yes that's your final answer

Answer 8

notice how isotope A is very abundant (99.762%) so it makes sense that the average mass is close to isotope A's mass

Answer 9

yes it all looks perfect

Answer 10

you're welcome and have a good night