Final answer:12 tenths plus 9 tenths equals 2.1 in decimal form or 21 tenths infractionalform.Explanation:This problem is asking us to addfractions: 12 tenths and 9 tenths. First, we need to understand what fractional tenths represent. One tenth is equivalent to 0.1 in decimal form. Therefore, 12 tenths is equivalent to 1.2, and 9 tenths is equivalent to 0.9.Now, we can add these decimals together: 1.2 (or12 tenths) + 0.9 (or9 tenths) = 2.1. Therefore, 12 tenths plus 9 tenths is equal to 2.1, or in fractional form,21 tenths.Learn more about Fraction Addition here:brainly.com/question/14427715#SPJ2...

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