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mario62 [17]
3 years ago
6

Use rules of addition to find the sum -1+3=

Mathematics
1 answer:
Gnesinka [82]3 years ago
8 0

Answer:

2

Step-by-step explanation:

go back wards by 2 to get the answer

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What is the measure of an angle if the measures of its two adjacent supplementary angles add up to 100°?
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<h3>Answer:  130</h3>

Explanation:

Let x be the unknown angle we want to find.

Let y be adjacent and supplementary to x. This means x+y = 180

Let z also be adjacent and supplementary to x. So x+z = 180 also

Subtracting the two equations leads to y-z = 0 and y = z. So effectively we've proven the vertical angle theorem.

Since the supplementary angles to x add to 100, we know that y+z = 100. Plug in y = z and solve for z

y+z = 100

z+z = 100

2z = 100

z = 100/2

z = 50

Therefore,

x+z = 180

x+50 = 180

x = 180-50

x = 130

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