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3 years ago

-4 + 8x = -20 what is this answer

Mathematics

2 answers:

kipiarov [429]3 years ago

5 0

Answer:-2

Step-by-step explanation:

4+(-20)=-16

-16 / 8 = -2

Serjik [45]3 years ago

3 0

-4 + 8x = -20

move -4 to the other side

sign changes from -4 to +4

-4+4+8x=-20+4

8x=-20+4

8x=-16

divide both sides by 8 to get x by itself

8x/8=-16/8

answer:

x=-2

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3 years ago

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3 years ago

Find x, and then any unknown angles in the quadrilateral. x= ?

sertanlavr [38]

Answer:

x=65

other angle= 165

Step-by-step explanation:

quadrilaterals always have a total of 360 degrees

because of this you can set up an equation and solve

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7 0

3 years ago

Which is a factor of 144 - 49x²? O 12-7x² O 72-7x² O 12-7x O 72 + 7x

lisabon 2012 [21]

Answer: C: 12-7x

Step-by-step explanation:

This expression is a good example of the difference of two squares, as 144 is the square of 12, while 49x² is the square of 7x.

Any difference of two squares $a^2-b^2$ can be factored into the sum of their square roots times the difference of their square roots $(a+b)(a-b)$ .

Let's factor our expression.

$144-49x^2=(12+7x)(12-7x)$

Out of all the options given, only $12-7x$ is a factor. Hence, option C is correct.

4 0

2 years ago

Area of a regular decagon with side length of 8in

Scrat [10]

Answer:

492.43in²

Step-by-step explanation:

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3 years ago