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kotykmax [81]
3 years ago
14

The perimeter of ABCD is 66 and DC is twice as long as CB how long is a B

Mathematics
1 answer:
Natali5045456 [20]3 years ago
3 0
<span>Length = x Width = 2x
Perimeter = 2 * length + 2 * width
= 2x + 4x
= 6x 
6x = 66
x = 11 
</span><span>Length = x Width = 2x
Perimeter = 2 * length + 2 * width
= 2x + 4x
= 6x 
6x = 66
x = 11</span>
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13.02-6y=8y using the method of solving linear equations
gregori [183]

well add -6y to 6y which equals 0 then add 8y to 6y which equals 14y

now you have 13.02=14y 

now you can divide 13.02 divided into 14 which equals 0.93

0.93 = y

5 0
3 years ago
Anyone know how to do this?!!
iren2701 [21]

Answer:

slope is -1/4

Step-by-step explanation:

\frac{-4}{12}=\frac{-1}{4}

\frac{-2}{8}= \frac{-1}{4}

and so on...

formula: \frac{x}{y}

hope this helps!!!

6 0
2 years ago
Find the sum of the measures of the interior angles of a convex 30-gon.
Kisachek [45]
The sum of the interior angles of a polygon with N sides is (N-2) x 180 degrees.

For a 30-gon, the sum of interior angles is (28) x (180) = <u>5,040 degrees</u>.

It makes no difference whether or not the polygon is convex at every vertex.
7 0
3 years ago
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2 7/9 × 1 1/5 ÷ 2 1/2
Anna007 [38]

Answer

5/36 (\frac{5}{36})

7 0
3 years ago
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Two more than the square of a number is 123 what is the number? Can someone please explain to me how to do this
max2010maxim [7]

Give the number a label.  That can be anything you want.  A lot of people will use 'x' every single time they do a math problem,but there's no reason to do that and it's boring.  Let's call our number ' M ' for 'Mystery number'.  OK ? 

                                             The number . . . M
                       The square of the number . . . M²
Two more than the square of the number . . . M² + 2

You said that this is equal to 123,  so we can write    <u> M² + 2 = 123</u>

That's the equation we have to take and solve for ' M '.

Subtract  2  from each side of the equation, and you have    M² = 121 .

Take the square root of each side:    M = √121 .

The Mystery number is the square root of  121.

If you don't happen to know what that is, then you can use your pocket
calculator, or the calculator that comes with your computer (if you know
how to find it).  They will all tell you that the square root of  121  is  <em>11</em> .

That's a fine and wonderful answer, but technically, it's only half of the
answer.  Any equation that has something squared in it almost always
has two solutions, and this one does.

The square root of  121  is a number that gives you  121  when you
multiply it by itself.  ' 11 ' does that:  (11 x 11) = 121 .  Is there <em><u>another</u></em>
number that does the same thing ?

How about ' -11 ' ?  Look at this:  ( -11 x -11 ) = 121 .  (Remember that
if both numbers being multiplied have the <em>same sign</em>, then their product
is positive.)

The bottom line is:  The mystery number is<em>  +11</em>  and also<em>  -11</em> .
Either one does what you want . . . When you square it and then
add  2  more, you get  123  either way.


6 0
3 years ago
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