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Murrr4er [49]
3 years ago
10

Help please.....!!!!!??????^-^

Mathematics
1 answer:
KiRa [710]3 years ago
8 0
I just told you the answer it is -5
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PLS SOLVE ASAP!!!
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180 + 30x = 60 + 50x
⇒ 20x = 120
⇒ x = 6 minutes

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(6.25•10^9)(9.8•10^16)
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How many classifications shown contain organisms whose cells do not have nuclei?
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What is the slope and y-intercept of this line?
RUDIKE [14]
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6 0
3 years ago
How is the series 9 + 13+ 17+ ... + 149 represented in summation notation?
VLD [36.1K]

Notice that

13 - 9 = 4

17 - 13 = 4

so it's likely that each pair of consecutive terms in the sum differ by 4. This means the last term, 149, is equal to 9 plus some multiple of 4 :

149 = 9 + 4k

140 = 4k

k = 140/4

k = 35

This tells you there are 35 + 1 = 36 terms in the sum (since the first term is 9 plus 0 times 4, and the last term is 9 plus 35 times 4). Among the given options, only the first choice contains the same amount of terms.

Put another way, we have

\displaystyle 9 + 13 + 17 + \cdots + 149 = \sum_{k=0}^{35} (9 + 4k)

but if we make the sum start at k = 1, we need to replace every instance of k with k - 1, and accordingly adjust the upper limit in the sum.

\displaystyle 9 + 13 + 17 + \cdots + 149 = \sum_{k-1=0}^{35+1} (9 + 4(k-1))

\displaystyle 9 + 13 + 17 + \cdots + 149 = \sum_{k=1}^{36} (5 + 4k)

7 0
2 years ago
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