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laila [671]
3 years ago
14

Prove the sum of two rational numbers is rational where a, b, c, and d are integers and b and d cannot be zero. Steps Reasons 1.

A over b plus c over d Given 2. Ad over bd plus cb over bd Multiply to get a common denominator 3. Simplify Fill in the missing step in the proof. ad times cb all over bd ad plus cb all over bd ad minus cb all over bd ad plus cb all over two times bd
Mathematics
2 answers:
harkovskaia [24]3 years ago
6 0

Answer:

\dfrac{ad+bc}{bd}

Step-by-step explanation:

Let \frac{a}{b} and \frac{c}{d} be two rational numbers, where b and d are not zero and a, b, c and d are integers.

1. Given:

\dfrac{a}{b}+\dfrac{c}{d}

2. Multiply to get a common denominator :

\dfrac{a}{b}+\dfrac{c}{d}=\dfrac{ad}{bd}+\dfrac{cb}{db}

3. Simplify:

\dfrac{a}{b}+\dfrac{c}{d}=\dfrac{ad}{bd}+\dfrac{cb}{db}=\dfrac{ad+bc}{bd}

4. Since b\neq 0,\ d\neq 0, then bd\neq 0.

If a,b,c,d are integers, then bd, ad,bc, ad+bc are integers too. So the fraction

\dfrac{ad+bc}{bd}

is a rational number

LuckyWell [14K]3 years ago
3 0

Answer:

c

Step-by-step explanation:

i took the test

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in a proportional relationship the ratio y/x is constant. Show that this ratio is not constant for the equation y=a-14
Colt1911 [192]

To show that the ratio \frac{y}{x} is not constant for the function y=a-14 we only need to evaluate this function at 2 points and then show that the ratio is not the same for those two points. Note that here a represents x.  

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y=20-14=6. For this value of a the point is point is (20,6). The ratio \frac{y}{x} =\frac{6}{20}. For the a=28, y=28-14=14. For this value of a the  point is (28,14) . The ratio \frac{y}{x} =\frac{14}{28} =\frac{1}{2}. Clearly this ratio is not constant for all ordered pairs.

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Answer:

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Leave the 8 alone. Subtract 3 from 7.

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So answer is:

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