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mamaluj [8]
3 years ago
7

-k+4(k+1)=2k whats k

Mathematics
1 answer:
Ivenika [448]3 years ago
5 0

Step-by-step explanation:

-k + 4(k + 1) = 2k

-k + 4k + 4 = 2k

-k + 4k - 2k = -4

(-1 + 4 - 2)k = -4

k = -4

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In a running competition, a bronze, silver and gold medal must be given to the top three girls and top three boys. If 15 boys an
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Answer:

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Step-by-step explanation:

Since there are two competitions, one for boys and one for girls, and we want all the possible results we will calculate the possible combinations for the boys and multiply them by the possible combinations for the girls. This is shown below:

Boys = \frac{15!}{3!(15 - 3)!} = \frac{15!}{3!12!} = \frac{15*14*13*12!}{3!12!}\\Boys = \frac{15*14*13}{3*2*1}\\Boys = \frac{15*14*13}{3*2*1}\\Boys = 455

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3 0
4 years ago
Lisa drove 240 miles, then increased her speed by 20 miles per hour for 540 miles. If the second part of the drive took 3 hours
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We have been given that Lisa increased her speed 20 mph than initial speed over next 540 miles. So her speed on next 540 miles will be u+20 mph.

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