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kiruha [24]
3 years ago
13

Due at 11:59 P.M. Desperate

Mathematics
1 answer:
pantera1 [17]3 years ago
6 0

Answer: Your answer should be A.

Step-by-step explanation:

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S=n(a1+an)/2 gives the partial sum of an arithmetic sequence. What is the formula solved for an?
Veseljchak [2.6K]
S = n(a1 + an)/2
2S = n(a1 + an)
2S = na1 + nan
nan = 2S - na1
an = (2S - n a1)/n
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After John worked at a job for 10 years, his salary doubled. If he started at $x, his salary after 10 years is _____
Mkey [24]

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After ten years his salary is x2

Step-by-step explanation:

8 0
3 years ago
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It's in the attachment <br> URGENT
maxonik [38]

Step-by-step explanation:

\frac{2a}{a + b - c}  =  \frac{2b}{b + c - a}  =  \frac{2c}{a + c - b}  = k \\  \\ by \: theorem \: on \: equal \: ratios \\   \\ \frac{2a + 2b + 2c}{a + b - c + b + c - a + a + c - b}  = k \\  \\  \frac{2(a + b + c)}{a + b + c}  = k \\ \\   \therefore \: k = 2

5 0
3 years ago
12 = 2 + d; d = i am so confused pls help
BaLLatris [955]
If your asking what d equals, then it’s 10
7 0
3 years ago
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