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aliozochika
28.10.2019 •
Mathematics
Which expression results in a rational number?
a. 1.5 + sqrt 1.5
b. 12 - sqrt 12
c. 3/4 * sqrt 3/4
d 25 / sqrt 25
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Ответ:
option D is rational
Step-by-step explanation:
A rational number is a number that can be written in the form of fraction or integer
here in the given question
A) 1.5 + √1.5
now,
√1.5 is not rational as √1.5 = 1.2247448713915890490986420373529
hence A is not rational
b) 12 - √12
√12 is not rational as √12 = 3.4641016151377545870548926830117
hence B is not rational
c)![\frac{3}{4}\times\sqrt\frac{3}{4}](/tpl/images/0349/8258/a0a1d.png)
here,
D)![\frac{25}{\sqrt{25}}](/tpl/images/0349/8258/8e92d.png)
now,
√25 = 5
hence,
therefore,
option D is rational
Ответ:
15x - 5y = 14
15x - 5(3x - 7) = 14
15x - 15x + 35 = 14
15x - 15x = 14 - 35
0 = - 21...incorrecttherefore, this has no solution