The null hypothesis is
The symbol
is the Greek letter mu
The alternate hypothesis is
telling us we have a two-tailed test here. The "not equal" is directly tied to the keyword "different" given in the instructions. In other words, mu being different from 39.09 directly leads to

So either mu is 39.09 or it's not 39.09
You can use H0 and H1 to represent the null and alternate hypotheses respectively.
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Summary:
The two hypotheses are
H0:

H1:

This is a two tailed test.