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Tpy6a [65]
3 years ago
10

Can someone tell me if this is right thanks

Mathematics
2 answers:
andreyandreev [35.5K]3 years ago
7 0

bearing in mind that an absolute value expression is in effect a piece-wise expression, because it has a ± version.


\bf 3|x|+7=28\implies 3|x|=21\implies |x|=\cfrac{21}{3}\implies |x|=7\implies  \begin{cases} +(x)=7\\ -(x)=7 \end{cases} \\\\[-0.35em] ~\dotfill\\\\ +(x)=7\implies \boxed{x=7}~\hfill  -x=7\implies \boxed{x=-7}

saveliy_v [14]3 years ago
3 0

Yeah because 31x1+7-7=28-7=21

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svet-max [94.6K]
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2 years ago
Cos(-170°) = _____<br><br> -cos10°<br> cos10°<br> cos(-10°)
ikadub [295]

<em>The right answer for:</em>

<em>cos(-170°) = _____</em>

<em>is:</em>

<em>-cos10°</em>

<h2>Explanation:</h2>

The cosine function is an even function, which means that for every point (x,y) on the graph of y=cos(x) then the point (-x,y) also lies on the graph of the function. In other words, we can write:

cos(-170^{\circ})=cos(170^{\circ})

But:

170^{\circ}=180^{\circ}-10^{\circ}

So:

cos(170^{\circ})=cos(180^{\circ}-10^{\circ})

By property:

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<h2>Learn more:</h2>

Trigonometric functions: brainly.com/question/2680050

#LearnWithBrainly

4 0
3 years ago
Jake says adding 0 to an addendum does not change a sum. Is he correct
siniylev [52]
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Example:

10+10=20
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5 0
2 years ago
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Alisiya [41]

Answer:

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3 0
2 years ago
Read 2 more answers
A square has an area of 576 square inches. How long is each side in feet?
Maru [420]
The area of this square is said to be 576 square inches.
The formula for the area of a square is the length of one side squared.
Let's use l to represent the side length.
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To find l, find the square root of both sides.
<span>√576 = 24
</span>
The length of each side of the square is 24 inches.
But the question is asking for it in feet.
12 inches = 1 foot so 24 inches = 2 feet
This means each side of the square is 2 feet long.

Answer:
2 feet
5 0
2 years ago
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