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3 years ago

Help asap :) .................. I know you can do it

Mathematics

2 answers:

Anettt [7]3 years ago

8 0

Answer:

Is this even mathematical? but I think its D

asambeis [7]3 years ago

7 0

Answer:

it's e or b

Step-by-step explanation:

the circle would have to be where it started!

so sorry if this is wrong

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a. Show that the system of rational expressions is closed under addition, or give an example showing the contrary.

otez555 [7]

A "rational expression" is a fraction in which the numerator and the denominator are both polynomials. The sum of two such expressions will always produce another such expression, viz.,
p(x)/q(x) + r(x)/s(x) = [p(x)s(x) + q(x)r(x)] / [q(x)*s(x)]. 
The numerator and denominator of the sum will both be polynomials when fully expanded

7 0

3 years ago

What is the square root

DedPeter [7]

I guess it’s gonna be -3/2?

7 0

3 years ago

Laura is on the swim team. Each day she swims 800 m. How many kilometers does she swim each day? Be sure to include the correct

kap26 [50]

Answer:

0.8 km

Explanation:

Given she swims:

800 m

Conversion:

1 km ↔ 1000 m

In kilometers:

(800/1000) km = 0.8 km

3 0

2 years ago

Read 2 more answers

There has been a great deal of controversy over the last several years regarding what types of surveillance are appropriate to p

alexira [117]

Answer:

Given that a person was identified as a future terrorist, there is a 2.8544% probability that he/she actually is a future terrorist.

Step-by-step explanation:

There are 1000 future terrorists in a population of 300,000,000. So the probability that a randomly selected person in this population is a terrorist is:

$P = \frac{1,000}{300,000,000} = 0.000003 = 0.0003%$

So, we have these following probabilities:

A 99.9997% probability that a randomly chosen person is not a terrorist.

A 0.0003% probability that a randomly chosen person is a terrorist.

A 98% probability that a future terrorist is correctly identified

A 99.9% chance of correctly identifying someone who is not a future terrorist. This also means that there is a 0.01% probability of someone who is not a terrorist being identified as one.

This can be formulated as the following problem:

What is the probability of B happening, knowing that A has happened.

It can be calculated by the following formula

$P = \frac{P(B).P(A/B)}{P(A)}$

Where P(B) is the probability of B happening, P(A/B) is the probability of A happening knowing that B happened and P(A) is the probability of A happening.

Here we have:

What is the probability that the person is a terrorist, given that she was identified as a terrorist.

P(B) is the probability that the person is a terrorist. So $P(B) = 0.000003$

P(A/B) is the probability that the person was identified as a terrorist, given that she is a terrorist. The problem states that the system has a 98% chance of correctly identifying a future terrorist, so $P(A/B) = 0.98$