Is 8.4 a rational number

2 answers:

6 0

Yep.

All rational numbers are terminating or repeating decimals (this one is terminating because it ends). This number can also be written as a ratio of two integers (84/10).

Valentin [98]3 years ago

4 0

I think 8.4 is a rational number

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Make x the subject of the following formula x^2+3=h <br> 2x=2y=p<br> s=x^2-3

madam [21]

Answer:

x^2+3=h

to make x the subject of the formula,move 3 to the other side making it negative

x^2 = h + 3

to take out the square,take the square root of both sides.

√x^2 = √ h + 3

x = √ h + 3.

you can ask me questions privately when confused .

6 0

3 years ago

The probability that a lab specimen contains high levels of contamination is 0.14. A group of 4 independent samples are checked.

Shtirlitz [24]

Answer:

a) 0.5470 = 54.70% probability that none contain high levels of contamination.

b) 0.3562 = 35.62% probability that exactly one contains high levels of contamination.

c) 0.4530 = 45.30% probability that at least one contains high levels of contamination.

Step-by-step explanation:

For each sample, there are only two possible outcomes. Either they contain high levels of contamination, or they do not. The samples are independent. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$