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Mariana [72]
3 years ago
9

Which of the following is a radical equation?

Mathematics
2 answers:
elena-s [515]3 years ago
7 0

The condition for an equation to be a <u>Radical Equation</u> (or Irrational Equation) is that the value we are looking for (this means the variable of the equation) must be under a radical (inside a root \sqrt{} sign).



Now, according to this, <u>the only equation that fulfills this condition is </u><u>c</u>, because its variable x is under a radical:



\sqrt{x+3}=13



The others, as we can see, don’t have the variable under a radical:


a) x\sqrt{3}=13


b) x+\sqrt{3}=13


d) x+3=\sqrt{13}



To solve this radical equation, we have to square both sides the equation:


{\sqrt{x+3}}^{2}=13^{2}


x+3=169


x=169-3


x=166

attashe74 [19]3 years ago
6 0
The answer for this question is C. 
First subtract the 3 from both sides to get : sqrt(x) = 10
Then square both sides to get: x = 100
The other equations can't simply proving that they cannot be radical equations
Hope this helps :)

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Otto had two days to paint 9 paintings. He painted 5 1\5 yesterday. How many paintings does Otto need to paint today?
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Answer:

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OverLord2011 [107]

Answer:

Binomial distribution requires all of the following to be satisfied:

1. size of experiment (N=27) is known.

2. each trial of experiment is Bernoulli trial (i.e. either fail or pass)

3. probability (p=0.14) remains constant through trials.

4. trials are independent, and random.

Binomial distribution can be used as a close approximation, with the  usual assumption that a sample of 27 in thousands of stock is representative of the population., and is given by the probability of x successes (defective).

P(x)=C(N,x)*p^x*(1-p)^(n-x)

where N=27, p=0.14, and C(N,x) is the number of combinations of x items out of N.

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