Explanation:
Since m is a unit in S, then, there exists b ∈ S such that m*b = 1, where 1 is the identity. Since S is a subring of R we have that m ∈ R, and therefore b is also the multiplicative inverse of m in R. The converse isnt true.
The set of real numbers is a Ring with the standard sum and multiplication. Every real number different from 0 has a multiplicative inverse. For example, the inverse of 2 is 1/2. However, 2 is not a unit on the subring of Integers Z.
Answer:

Step-by-step explanation:
<u>Step 1: Find the square root</u>
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Answer: 
It's takes about 4.6 hours if your rounding it to the nearest tenth
Answer:
Sorry I did not know your answer