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3 years ago

I need help remembering the steps to solve for 3x-7>2

Mathematics

2 answers:

goblinko [34]3 years ago

7 0

3x-7>2
add 7 to both sides: 3x>9
divide both sides by 3: x>9

Reika [66]3 years ago

3 0

Basically you just do the opposite of whatever is being done to x. So, first, you would ADD 7 to both sides to cancel it out from the side where x is. Remember: the goal is to isolate x. So, add 7, and you have:

3x - 7 + 7 > 2 + 7

Note that -7 + 7 = 0. So, we have successfully cancelled out that term. Then, just do the rest of addition:

3x > 9

Then, the the 3 is being multiplied to x, and you want to get rid of it on that side. So, you do the opposite of multiplication, which is division. You can divide the inequality by 3 on both sides to get:

3x / 3 = 9 / 3 or:
x = 3.

Note that 3x / 3 is equal to 1x or just x. Here we want that 1 to not get rid of x, because we want to find the value of x.

Remember: isolation of x is what you want. If you need more help/have questions, feel free to tell me.

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svet-max [94.6K]

Answer:

The polygon has 9 sides

Step-by-step explanation:

we know that

A regular polygon has equal length sides and equal interior angles

step 1

Find the measure of the interior angle

Remember that

The interior angle plus the exterior angle must be equal to 180 degrees (form a linear pair)

Let

x ----> the measure of each interior angle in the regular polygon

$x+40^o=180^o$

solve for x

$x=180^o-40^o=140^o$

step 2

Find the number of sides of the regular polygon

we know that

The measure of each interior angle in a regular polygon is given by the formula

$x=\frac{(n-2)180^o}{n}$

where

n is the number of sides of the polygon

substitute the given values

$140^o=\frac{(n-2)180^o}{n}$

solve for n

$140n=180n-360\\180n-140n=360\\40n=360\\n=9\ sides$

therefore

The polygon has 9 sides

8 0

3 years ago

The teacher passed out math books.The length is 10 inches and the width is 8 inches.What is the perimeter of each book?

miv72 [106K]

Answer: The perimeter of each book is: " 36 in. " .

__________________________________________________

Step-by-step explanation:

__________________________________________________

Note that the given units are all in "inches (in.)" .

Use the formula for the "perimeter of a rectangle" ;

{which happens to work for a "square" as well;

since a "square" is a rectangle.}.

__________________________________________________

This is based on the assumption that the book is shaped like a

"rectangle" (or "square" —which is a rectangle).

__________________________________________________

The formula for the Perimeter of a rectangle is:

P = 2 L + 2 w ;

in which:

P = the perimeter of the rectangle;

for which we shall solve; [in "inches (in.)" ] ;

L = the length of the rectangle = 10 in. (given) ;

w = the width of the rectangle = 8 in. (given) .

___________________________________________________

Now, plug the given values for the "length (L)" and the "width (w)" ;

as follows:

___________________________________________________

P = (2 * 10 in.) + (2 * 8 in.) ;

P = (20 in.) + (16 in.) ;

P = 36 in.

___________________________________________________

Answer: The perimeter of each book is: " 36 in. " .

___________________________________________________

Hope this helps!

Best wishes in your academic pursuits

— and within the "Brainly" community!

___________________________________________________

3 0

3 years ago

Work out the value of x

GREYUIT [131]

A full circle is 360°.

x + 3x + 90° = 360°

4x = 360° - 90°

4x = 270°

4x/4 = 270°/4

x = 67.5°

Hope it helps! Make me brainliest if it’s correct.

6 0

3 years ago

What is 1/7+2/3 fractions

cricket20 [7]

Answer:

$\frac{17}{21}$

Step-by-step explanation:

$\frac{1}{7}$ + $\frac{2}{3}$ ( multiply $\frac{1}{7}$ by 3 and $\frac{2}{3}$ by 7 to get a common denominator)

$\frac{3}{21}$ + $\frac{14}{21}$ = $\frac{17}{21}$

5 0

3 years ago

Fractions,decimals,percents 0.25= 0.25% 2.5% 25%

abruzzese [7]

Hello!

To convert, we just multiply our decimal by 100.

0.25(100)=25

Our answer is D) 25%

I hope this helps!

6 0

3 years ago