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KiRa [710]
3 years ago
15

What value of k makes the trinomial x^2- 10x + k a perfect square?

Mathematics
1 answer:
Advocard [28]3 years ago
3 0

Answer: 25

Step-by-step explanation:     (x-a)² = x² - 2ax + a²

  From x² - 10x + k  we deduce that 10x = 2·5x  and a = 5

Then k = 5²2

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The probability that Ariana is on time for a given class is 69 percent. If there are 39 classes during the semester, what is the
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Answer:

The best estimate of the number of times out of 39 that Ariana is on time to class is 27.

Step-by-step explanation:

For each class, there are only two possible outcomes. Either Ariana is on time, or she is not. The probability of Ariana being on time for a class is independent of other classes. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

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E(X) = np

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Rounding

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