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choli [55]
3 years ago
10

Σ^30 (3n + 7) - [?] 1​

Mathematics
1 answer:
netineya [11]3 years ago
7 0

I dont know how to solve this but heres a suggestion: Use PEMDAS

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How do I solve fro r and q?<br><br> 9r+q=13<br> 3r+2q=-4
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One way to solve the system of equations would be to solve for q (in terms of r) in the first equation to get:
9r + q = 13
q = 13 - 9r

Then, take the value for q you just found and insert it into the second equation:
3r + 2(13-9r) = -4

Then simplify and solve:
3r + 26 - 18r = -4
-15r = -30
r = 2

Now that you have the value for r, plug it into either of the original equations and solve for q:
9r + q = 13
9(2) + q =13
18 + q = 13
q = -5

r = 2; q = -5
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