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shepuryov [24]
3 years ago
13

Factor completely: x^2-81

Mathematics
1 answer:
mina [271]3 years ago
3 0
I'm not sure if this is correct but (x + 9) • (x - 9)
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In the diagram, transversal t cuts parallel lines a and b. Which equation is necessarily true?
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Answer:

The correct answer is option B.  

m<3 = m<6

Step-by-step explanation:

From the figure we an see that, a and b are parallel lines and line t is the traversal on the lines.

<u>To find the correct option</u>

From the given figure we get

Corresponding angles are,

<1 & <5,  <2&<6, <2&<7 and <4 &<8

Alternate interior angles are,

<3 & <6  and <4 &<5

Alternate interior angles are equal.

m<3 = m<6

Therefore the correct answer is optionB

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11 less than 7 times a number is 5 more than 6 times the number. find the number.
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Let's translate the words into expressions:

11 less than 7 times a number is 7x-11

5 more than 6 times the number is 6x+5

So we have the equation

7x-11 = 6x+5

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