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3 years ago

I need brainly help with this math problem I reward with brainiest

Mathematics

1 answer:

kumpel [21]3 years ago

3 0

Answer:

I believe its D

Step-by-step explanation:

because the Xs do not repeat but on the other answer choices , they do .

Hope I could help -

Sleepy~

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The half-life of radioactive cobalt is 5.27 years. Suppose that a nuclear accident has left the level of cobalt radiation in a c

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Answer:

35 years

Step-by-step explanation:

The proportion p that remains after y years is ...

p = (1/2)^(y/5.27)

In order for 1/100 to remain (the level decays from 100 times to 1 times), we have ...

.01 = .5^(y/5.27)

log(0.01) = y/5.27·log(0.5) . . . take logs

y = 5.27·log(0.01)/log(0.5) ≈ 35.01 ≈ 35 . . . . years

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3 years ago

What is the upper and lower quartile of this set of data? 15, 19, 20, 25, 31, 38, 41

aev [14]

Answer:

Upper quartile: 38
Lower quartile: 19

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2 years ago

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A swim meet has 13 contestants signed up for the 100-meter butterfly event. The first heat has 6 swimmers. How many different wa

tino4ka555 [31]

Answer:

6 swimmers in the first heat can be arranged in 1716 different ways.

Step-by-step explanation:

A swim meet has 13 contestants signed up. To calculate the arrangement of first 6 swimmers in first heat we will use combinations because order doesn't matter.

So to select 6 swimmers out of 13 contestants number of different ways

= $^{13}C_{6}$

= $\frac{13!}{(6!)(13-6)!}$

= $\frac{13\times 12\times 11\times 10\times 9\times 8\times 7!}{6!\times 7!}$

= $\frac{13\times 12\times 11\times 10\times 9\times 8}{6\times 5\times 4\times 3\times 2\times 1}$

= $\frac{1235520}{720}$

= 1716

Therefore, 6 swimmers in the first heat can be arranged in 1716 different ways.

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2 years ago

Y = f(x + 3) + 3<br> Graph

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Step-by-step explanation:

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One person can do a certain job in fifteen minutes and another person can do the same job in thirty minutes how many minutes wil

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Together it would be 20 min.

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3 years ago

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