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4 years ago

Evaluate the expression when a = 2 and b = 4. 6a – 2b + 5

Mathematics

2 answers:

Serggg [28]4 years ago

5 0

the answer is 6(2) - 2(4) + 5

answer: 9

baherus [9]4 years ago

5 0

A=2
b=4
-----

6a-2b+5
6(2)-2(4)+5
12-8+5
4+5
9

Your answer is 9

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Suppose on a certain planet that a rare substance known as Raritanium can be found in some of the rocks. A raritanium-detector i

aleksandrvk [35]

Answer:

0.967 = 96.7% probability the rock sample actually contains raritanium

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

$P(B|A) = \frac{P(A \cap B)}{P(A)}$

In which

P(B|A) is the probability of event B happening, given that A happened.

$P(A \cap B)$ is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Positive reading

Event B: Contains raritanium

Probability of a positive reading:

98% of 13%(positive when there is raritanium).

0.5% of 100-13 = 87%(false positive, positive when there is no raritanium). So

$P(A) = 0.98*0.13 + 0.005*0.87 = 0.13175$

Positive when there is raritanium:

98% of 13%

$P(A) = 0.98*0.13 = 0.1274$

What is the probability the rock sample actually contains raritanium?

$P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0.1274}{0.13175} = 0.967$

0.967 = 96.7% probability the rock sample actually contains raritanium

7 0

3 years ago

A circular swimming pool has a radius of 20 feet. A fence is going to be built so that there is a 4-foot space around the entire

Law Incorporation [45]

Answer: she forgot to multiply the radius by 2 in the formula .

Step-by-step explanation:

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3 years ago

Read 2 more answers

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Vesnalui [34]

Answer:

6 because why not

Step-by-step explanation:

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3 years ago

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Answer:

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Step-by-step explanation:

We want to find

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This can be rewritten as;

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Recall that; $i^2=-1$

$5^3(-1)^4\times i$

We evaluate now to obtain;

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3 years ago

If a neutral atom gains an electron, what is its charge?

DENIUS [597]

C. Negative because since the neutral atom stands at 0 and positive ions are 1+ and electrons are negative if it gains the electron ( negative ) it will become negative.

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3 years ago