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3 years ago

18,19,20,21,23 please help me. I really need this answer.please help me.

Mathematics

1 answer:

sp2606 [1]3 years ago

7 0

Answer:

18. Supplementary

19. Vertical

20. x = 7

23. x = 25

Step-by-step explanation:

Use angle relationships to make equations which you can solve for x.

Example:

18. These two angles form a line. These are called supplementary.

19. These angles are across a vertex from each other and are equal or the same.

20. 9x + 1 = 7x - 9 + 5x - 11

9x + 1 = 12x - 20

9x - 9x + 1 = 12x - 9x - 20

1 = 3x - 20

1 + 20 = 3x - 20 + 20

21 = 3x

7 = x

23. These two angles are across a vertex from each other. This means the angles are equal. Think of it as a reflection. If you folded the paper on that vertex, the lines would be in the exact same place.

So set the two expressions equal to each other. Then use inverse operations to isolate x and solve.

5x + 4 = 8x - 71

5x - 5x + 4 = 8x - 5x - 71

4 = 3x - 71

4 + 71 = 3x - 71 + 71

75 = 3x

25 = x

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3 years ago

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zepelin [54]

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3 years ago

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Step-by-step explanation:

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4 years ago

A teacher asked his students to solve the equation w-15=22. One student incorrectly said that the solution is 7. What is the cor

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Answer:

$w= 37$

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The student used the wrong property of equality.

When you undo a number to get a letter by itself, you should do the opposite operation of the number said. The student subtracted 15 from 22 instead of adding 15 to 22.

Use the addition property of equality to isolate w.

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3 years ago