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4 years ago

15

Name a set of numbers closed under addition but not multiplication.

1 answer:

yaroslaw [1]4 years ago

8 0

The set of negative numbers are closed under addition but not under multiplication because whenever you add two negative numbers, you always have a negative number. But when you multiply two negative number, you have a positive number.

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Help please; I need the right answer

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Answer:

C.

Step-by-step explanation:

$\cos x+\sqrt{2}=-\cos x \\ 2\cos x = -\sqrt 2 \\ \cos x = -\dfrac{\sqrt 2}{2}\\ \\ \Rightarrow x = \pm \arccos\Big(-\dfrac{\sqrt 2}{2}\Big)+2k\pi,\quad x\in \mathbb{Z}\\ \Rightarrow x =\pm\dfrac{3\pi}{4}+2k\pi\\ \\ \\k = -1 \Rightarrow x < 0\\\\ k=0 \Rightarrow x 2\pi$

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4 years ago

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Match each angle below with its measurement.

brilliants [131]

A = 90 degrees
B = 50 degrees
D = 140 degrees
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3 years ago

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ElenaW [278]

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Step-by-step explanation:

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3 years ago

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Given the conversion factor 12 in/ 1 ft, which has the larger volume?

dsp73

Answer:

A. Cube A

Given:

Cube A volume = 5832 in³

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2 years ago

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