2 years ago

Simplify the expression. 7x2 + 3 - 5(x2 - 4) 2x2-17 2x2-1 2x2 + 23 25x2

Mathematics

1 answer:

Blizzard [7]2 years ago

3 0

Answer:

1. 14+3-5(-2)= 17+10=27

2. 14-17= -3

3. 4-1=3

4. 4+23=27

5. 50

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D. And trapezoid is not a quadrilateral.

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3 years ago

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Inga [223]

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Step-by-step explanation:

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Solve this system of equations. x + y = -3 x - y = 1

Sindrei [870]

A. (-1,-2)

Because:
x + y = -3
-1 + (-2) = -3
-3 = -3

x - y = 1
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3 years ago

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The probability that a lab specimen contains high levels of contamination is 0.10. A group of 4 independent samples are checked.

galben [10]

Answer:

a) 0.6561

b) 0.2916

c) 0.3439

Step-by-step explanation:

We are given the following information:

Let us treat high level of contamination as our success.

p = P(High level of contamination) = P(success) = 0.10

n = 4

The, by binomial distribution:

$P(X=x) = \binom{n}{x}.p^x.(1-p)^{n-x}\\\text{where x is the number of success}$

a) P(No high level of contamination)

We put x = 0, in the formula.

$P(X=0) = \binom{4}{0}.(0.10)^0.(1-0.10)^{4} =0.6561$

Probability that no lab specimen contain high level of contamination is 0.6561

b) P(Exactly one high level of contamination)

We put x = 1, in the formula.

$P(X=1) = \binom{4}{1}.(0.10)^1.(1-0.10)^{3} =0.2916$

Probability that no lab specimen contain high level of contamination is 0.6561

c) P(At least one contains high level of contamination)

$p(x \geq 1) = 1 - p( x = 0) = 1 - 0.6561 = 0.3439$

Probability that at least 1 lab specimen contain high level of contamination is 0.3439

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3 years ago

7 - 3 = -x + 1 Solve for X.

Sati [7]

7-3=-x+1
4=-x+1 substract 1
-1 -1
4-1=-x
3=-x multiply by -1
•(-1) •(-1)
-3=x
x=-3

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2 years ago

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