All 3 angles of a triangle add up too 180, so 80+55= 135, 180-135 is 45, so the value of x is 45
Answer:
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I'm not sure what to do for the "arithmetic approach" but for the algebraic approach:
The equation you need to solve would be 5.35x + 182.90 = 750
when you solve it, you would get x = 106, meaning they would have to sell 106 more
Sequence: 36, 31, 26, 21
Here, a = 36
d = 31 - 36 = -5
Recursive rule: a(n) = a(n-1) - 5
Hope this helps!