Math

The layer of gold coating on a ring should be 0.03 millimeters thick when the ring is completed. A coating of 0.021 millimeters has already been applied. How many more millimeters of gold coating must be added to finish the ring?

A. 0.18 millimeters
B. 0.09 millimeters
C. 0.009 millimeters
D. 0.018 millimeters

I believe it is either C or B. But strongly leading towards B
If I'm wrong please elaborate how to correct my problem

asked by Jocelynn
  1. B is not correct.

    0.030
    -0.021
    ________

    posted by Ms. Sue
  2. So C?

    posted by Jocelynn
  3. Why do you think it's c? Did you do the subtraction?

    0.030
    -.021
    ________

    posted by Ms. Sue
  4. yes i got 0.009?

    posted by Jocelynn
  5. Yes. C is the answer.

    :-)

    posted by Ms. Sue

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