Answer:

Step-by-step explanation:
It's an arithmetic sequence.

The difference is constant.
The explicit formula of an arithmetic sequence:

Substitute:

<em>use distributive property</em>

I think the answer is eight because the answer should be eight probably ate it is the best answer I think it is best
Answer:
x = 7
Step-by-step explanation:
Lets do the brackets first,
6 × 2x = 12
6 × -11 = -66
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Calculate the x constant:
12x - 3x = 9x
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Then the ones with no x:
-66 + 15 = -51
51 + 12 = 63
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Lastly, divide
63 ÷ 9 = 7
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Have a good day :)
This polynomial has only 3 terms, so it is a trinomial. <em>Hope it helps!</em>
Answer:
x=10
Step-by-step explanation:
Set up the equation, (3x+6)+54=90 because both angles equal up to 90 degrees, and then solve for x.