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3 years ago

I whats the answer????

Mathematics

2 answers:

dem82 [27]3 years ago

8 0

Answer:

The equations that are true are

Step-by-step explanation:

A) States that 0 + 451 = 0, but that is not true because...

0 + 451 = 451

B) States that 130 + 210 = 210 + 130, and that is true because...

130 + 210 = 210 + 130

340 = 340

C) States that (127 + 80) + 250 = 127 + (80 + 250), and it is true because...

(127 + 80) + 250 = 127 + (80 + 250)

127 + 80 + 250 = 127 + 80 + 250

457 = 457

D) States that (123 + 57) + 180 = 153 + (87 + 180), but that is not true because...

(123 + 57) + 180 = 153 + (87 + 180)

123 + 57 + 180 = 153 + 87 + 180

360 = 420 (but this does not make sence)

E) States that 497 + 0 = 497, and it is true because...

497 + 0 = 497

497 = 497

nika2105 [10]3 years ago

6 0

Answer:

E is true, B is true, C is true,

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Given:

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Each angle

Steps:

if 2 angles are supplementary that means they add up to 180°

(a + 10) + (a + 20) = 180

a + 10 + a + 20 = 180

2a + 30 = 180

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Now let's find value of each angle,

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