Answer:
120
Step-by-step explanation:
That's a guess, but it's the most logical one.
Wait u live in FL
cause i have one of those books too what grade are u in
189 because 20.7 rounds to 21 and 9.18 rounds to 9
21 * 9 = 189
7. subtraction property
division property
8. subtraction property
multiplication property
9. distribution property
addition property
division property
10. distribution property
combine like terms
addition property
division property
11. combine like terms
distribution property
subtraction property
subtraction property
division property
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Solve the trigonometric equation:

Make a substitution:

and the equation becomes

Rewrite conveniently
– t as
+ t – 2t, and then factor the left-hand side by grouping:

Factor out
2t + 1:

Substitute back for
t = cos x:

Therefore,

where
k is an integer.
Solution set:

I hope this helps. =)