3 years ago

Define parallel lines.

Mathematics

1 answer:

lara31 [8.8K]3 years ago

6 0

Answer:

Lines in the same plane that intersect to form a 90 degree angle

Step-by-step explanation:

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In triangle ABC, angle A = 2x°, angle B = (x-45)° and angle C = (x-15)°.

Lelechka [254]

$Sum\ of\ angles\ in\ triangle\ is\ equal\ to\ 180^{\circ}\\\\
To\ find\ x\ sum\ all\ angles:\\
2x+x-45+x-15=180\\\\
4x-60=180\ \ \ |Add\ 60\\\\
4x=60+180\\\\
4x=240\ \ \ |Divided\ by\ 4\\\\
x=60^{\circ}\\\\
\angle \ A=2x=2*60=120^{\circ}\\
\angle\ B=x-45=60-45=15^{\circ}\\
\angle\ C=x-15=60-15=45^{\circ}\\\\Triangle\ is\ \textbf{obtuse}.$

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3 years ago

5(d+2)=15 (will mark brainliest)

Aleonysh [2.5K]

Answer:

d = 1

Step-by-step explanation:

5(d+2)=15 (Given)

5d + 10 = 15 (distribute)

5d = 5 (subtraction)

d = 1 (division)

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3 years ago

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oksano4ka [1.4K]

Answer:

I believe the answer is A.

Step-by-step explanation:

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3 years ago

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Choose the preposition in the following sentence.

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The answer is (B) off

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2 years ago

How many milligrams of sodium thiosulfate (m.w. = 158) are represented by 0.25 mmol? (answer must be numeric; no units or commas

Natasha_Volkova [10]

To calculate for mass, simply multiply molar weight (MW) and number of mols. The molar weight (MW) is in units of mg / mmol. Therefore the mass is:

mass = (158 mg / mmol) (0.25 mmol)

mass = 39.5 mg

Answer:

39.5

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3 years ago