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beks73 [17]
3 years ago
11

Is the sum of two rational numbers always rational

Mathematics
1 answer:
Pepsi [2]3 years ago
8 0

Answer:

in short, Yes they are always rational.

here's why...

E.g. suppose \frac{c}{d} and \frac{a}{b} are fractions, that means that a,b,c,d are all integers, and b and d are not zero. finding the sum the numerator, and denominator would also have to be integers. the denominator of the sum can't be zero since the denominators of the fractions were not zero, and would give \frac{ad+bc}{bd} and since they are bound by addition (sum means addition) they must also be rational since eit would equal a bigger integer than initially had

Step-by-step explanation:

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Call these numbers x,y. Then x+y=7 or y=7-x.

We want to maximize their product,

f(x,y)=xy\implies f(x,7-x)=F(x)=7x-x^2

We could consider the derivative, but I think that's overkill. Instead, let's complete the square:

7x-x^2=-\left(x^2-7x+\dfrac{49}4\right)+\dfrac{49}4=\dfrac{49}4-\left(x-\dfrac72\right)^2

whose graph is a parabola opening downward with vertex at \left(\dfrac72,\dfrac{49}4\right), so that the maximum product is \dfrac{49}4.

Now if x=\dfrac72, it follows that y=7-\dfrac72=\dfrac72.

7 0
3 years ago
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Stolb23 [73]

Answer:

The hourly wage is $8.55 per hour

Step-by-step explanation:

Step 1: Determine the expression for the gross pay

Total gross pay=(Unit rate per hour×number of hours(≤40))+(Overtime rate×number of overtime hours)

where;

Total gross pay=$380.48

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Overtime rate=x×(1 1/2)=1.5 x

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Step 2: Replace to solve for hourly wage

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x=380.48/44.5

x=8.55

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5 0
3 years ago
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If the two distance provided are the two legs, you are looking for the hypotenuse. Use the pyth. theorem.

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4 0
4 years ago
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monitta
So based on your question where there is a rectangle inscribed in a semicircle or a radius 10 as shown in your figure. The possible function that could represent the are of the rectangle is A=2x*sqrt(100-x^2) i hope you are satisfied with my answer and feel free to ask for more
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4 years ago
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vfiekz [6]

Answer:

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Step-by-step explanation:

406 - 278 = 128

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