Answer:
(-6, -2)
Step-by-step explanation:
Don't really need to post the options to know what the expression(s) should look like.
"Sum of" tells you its addition and because it's addition the order of the two terms (the 3 and the N) don't matter.
Your correct expressions are:
3 + n
or
n + 3
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Subtract sides 4
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The value to your equation is 340. 10x34 is 340
The angle is 60° because it is one of three angles that make up an equilateral triangle.
Hope this helps! :)