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3 years ago

What does X in math mean for algebra

Mathematics

2 answers:

Leokris [45]3 years ago

7 0

Answer:

A variable or unknown

Step-by-step explanation:

An X in math usually indicates an unknown or a variable. As an unknown in an equation, X bears a value that you, a mathematician, have to find. As a variable in a function, X can be substituted with a numeric value, which then gives the value a function.

hoa [83]3 years ago

3 0

Answer:

the undetermined factor. usually what ur trying to figure out.

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which of the following steps indicates thr addition property of equality while solving the equation -1 -6x = x - 15?

VLD [36.1K]

Answer:

-1-6x=x-15

-6x+x=-15 +1

-6x^2=-14

x^2=-14 +6

x^2= -8

x=_/8

x=4

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2 years ago

A number N divided by -9 is -16

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Step-by-step explanation:

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3 years ago

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3 years ago

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Given that sin theta = 1/4, 0→theta→π/2, what<br>. what is the exact value of cos 8?

natali 33 [55]

<h3>Answer: Choice B $\frac{\sqrt{15}}{4}$ </h3>

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Work Shown:

Angle theta is between 0 and pi/2, so this angle is in quadrant Q1.

Square both sides of the given equation

$\sin \theta = \frac{1}{4}\\\\\sin^2 \theta = \left(\frac{1}{4}\right)^2\\\\\sin^2 \theta = \frac{1}{16}$

Then use the pythagorean trig identity to get

$\sin^2 \theta + \cos^2 \theta = 1\\\\\cos^2 \theta = 1-\sin^2 \theta\\\\\cos \theta = \sqrt{1-\sin^2 \theta} \ \ \ \text{cosine is positive in Q1}\\\\\cos \theta = \sqrt{1-\frac{1}{16}}\\\\\cos \theta = \sqrt{\frac{16}{16}-\frac{1}{16}}\\\\\cos \theta = \sqrt{\frac{16-1}{16}}\\\\\cos \theta = \sqrt{\frac{15}{16}}\\\\\cos \theta = \frac{\sqrt{15}}{\sqrt{16}}\\\\\cos \theta = \frac{\sqrt{15}}{4}\\\\$

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3 years ago

A carpenter cut a board that was 10 feet long into two pieces. The longer piece is 2 feet longer than three times the length of

velikii [3]

Answer:

shorter piece: 2 feet

longer piece: 8 feet

Step-by-step explanation:

let the shorter piece be x

then the longer piece will be 3x + 2

<u>if they join together</u>:

3x + 2 + x = 10
4x + 2 = 10
4x = 10 -2
4x = 8
x = 2

<u>Longer piece</u>:

3x + 2
3(2)+2
8 feet

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2 years ago

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