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seraphim [82]
3 years ago
11

Help me please!! This is timed and I’m stuck

Mathematics
2 answers:
marshall27 [118]3 years ago
5 0

Answer:

  • B. 13/2

Step-by-step explanation:

<u>Given equation:</u>

  • 2x² + 7x - 15 = 0

It has roots r and s.

We know how to find the sum and product of roots.

<u>Sum of roots:</u>

  • r + s = -7/2

<u>Product of roots:</u>

  • rs = -15/2

<u>Use the above two equations to work out the value of r - s:</u>

  • r - s = \sqrt{(r - s)^2}  =
  • \sqrt{(r+s)^2-4rs} =
  • \sqrt{(-7/2)^2-4(-15/2)} =
  • \sqrt{169/4} =13/2

Correct choice is B

Brums [2.3K]3 years ago
3 0

Answer:

D is the correct answer

Step-by-step explanation:

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Step-by-step explanation:

This problem can be modeled as a binomial probability model with probability of success p = 0.56.

The probability of x=13 successes (a college student being very confident their major would lead to a good job) in a number of trials of n=15 is:

P(X=x) = \frac{n!}{(n-x)!x!} *p^x*(1-p)^{n-x}\\P(X=13) = \frac{15!}{(15-13)!13!} *0.56^{13}*(1-0.56)^{15-13}\\P(X=13) = 0.01083=1.083\%

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