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bezimeni [28]
3 years ago
10

If a is a rational number and b is a rational number, then the product ab must be

Mathematics
2 answers:
alukav5142 [94]3 years ago
8 0
The best way to answer this is to find counterarguments for each answer to eliminate them as a possibility. ab doesn't have to be an integer, 2.5*3=7.5 . That's also not an imaginary number so that's out. And that's also not an irrational number so that's out too. Only choice left is rational number.
DIA [1.3K]3 years ago
8 0

By definition, a rational number can be expressed as a fraction with integer values in the numerator and denominator (denominator not zero). So, multiplying two rationals is the same as multiplying two such fractions, which will result in another fraction of this same form since integers are closed under multiplication. Thus, multiplying two rational numbers produces another rational number. 

So in this case your answer would be A. 

Hope I helped!!!


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3 years ago
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malfutka [58]

Answer:

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Step-by-step explanation:

Using binomial probability formula, we have :

P( a out of n ) =ⁿCₐ x pᵃ x qⁿ⁻ᵃ  ------------------------------------------------- (1)

Where n = total number of sample

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            p = probability of success

            q = probability of failure

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From the question:

n =10 , a = 7, p=0.54, q = 1-p = 0.46

Substituting into equation (1) we have:

P (7 out of 10) =  ¹⁰C₇ x (0.54)⁷x (0.46)¹⁰⁻⁷

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8 0
3 years ago
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enyata [817]

Answer:

The center is (2,8)

Step-by-step explanation:

The equation of a circle is written as

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where ( h,k) is the center and r is the radius

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6 0
4 years ago
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finlep [7]

Answer:

2.5

Step-by-step explanation:

50 x $0.05 = 2.5

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3 years ago
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