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krek1111 [17]
3 years ago
6

Find The Value of X: A= 12 B= 16 C= 21 D= 24

Mathematics
2 answers:
Dmitriy789 [7]3 years ago
5 0

Answer:

x = 21

Step-by-step explanation:

The 2 angles form a straight angle and are supplementary, thus

7x + 9 + 2x - 18 = 180, that is

9x - 9 = 180 ( add 9 to both sides )

9x = 189 ( divide both sides by 9 )

x = 21

neonofarm [45]3 years ago
4 0

Answer:

x = 21

Step-by-step explanation:

The 2 angles form a straight angle and are supplementary

7x + 9 + 2x - 18 = 180

9x - 9 = 180

9x = 189

x = 21

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(y - 2)2 = y2 – 6y + 4<br> Is this statement true or false?
trasher [3.6K]
<h3>Answer: False</h3>

==============================================

Explanation:

I'm assuming you meant to type out

(y-2)^2 = y^2-6y+4

This equation is not true for all real numbers because the left hand side expands out like so

(y-2)^2

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x(y-2) .... let x = y-2

xy-2x

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y(y-2)-2(y-2) ... replace x with y-2

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So if the claim was (y-2)^2 = y^2-4y+4, then the claim would be true. However, the right hand side we're given doesn't match up with y^2-4y+4

--------------------------

Another approach is to pick some y value such as y = 2 to find that

(y-2)^2 = y^2-6y+4

(2-2)^2 = 2^2 - 6(2) + 4 .... plug in y = 2

0^2 = 2^2 - 6(2) + 4

0 = 4 - 6(2) + 4

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0 = -4

We get a false statement. This is one counterexample showing the given equation is not true for all values of y.

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