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Zinaida [17]
2 years ago
12

Alex is feeling stressed this morning. He did not get enough sleep because a dog barked most of the night. The dog barked from 1

1;41p.m. until 12:09 a.m.Then it started barking again at 3:35 a.m. and didn’t stop until 4:10 a.m.How long did the dog bark in all?
Mathematics
1 answer:
inna [77]2 years ago
7 0

Answer:

Poor Alex, I know how they feel, I got a dog myself.

The amount of time between

11:41 pm to 12:09 am is

19 minutes (to 12 am, 60 minutes to next hour) + 9

which is 28 minutes for the first dog barking session

the second time is 35 minutes,

using same method as before.

adding the two separte barking sessions we get

35+28= 63 minutes

which is equivelant to 1 hour and 3 minutes.

In conclusion the dog barks for 1 hour and 3 minutes in total.

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What is the midpoint of a segment in the complex plane with endpoints at 6 -2i and -4 + 6i
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Answer:

Midpoint of a segment in the complex plane with endpoints at 6 -2i and -4 + 6i is:

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Step-by-step explanation:

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\dfrac{6-2i-4+6i}{2} \\\\=\dfrac{2+4i}{2}\\ \\=1+2i

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3 years ago
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4 years ago
Can someone help explain this to me? I don’t think I’m doing it right.
seropon [69]

∠B = 77°, a = 7.42 and b = 12.61

Solution:

Given triangle ABC.

∠A = 35°, ∠C = 68°, c = 12

To find the measure of ∠B:

Sum of all the angles of the triangle = 180°

⇒ ∠A + ∠B + ∠C = 180°

⇒ 35° + ∠B + 68° = 180°

⇒ 103° + ∠B = 180°

⇒ ∠B = 180° – 103°

⇒ ∠B = 77°

To find the length of a and b:

The side opposite to angle A is a.

The side opposite to angle B is b.

Using law of sine,

$\frac{\sin C}{c}=\frac{\sin A}{a}

$\frac{\sin 68^\circ}{12}=\frac{\sin 35^\circ}{a}

$\frac{0.9271}{12}=\frac{0.57357}{a}

Do cross multiplication, we get

$0.9271a=6.88284

Divide by 0.9271 on both sides, we get

⇒ a = 7.42

Again by law of sine,

$\frac{\sin C}{c}=\frac{\sin B}{b}

$\frac{\sin 68^\circ}{12}=\frac{\sin 77^\circ}{b}

$\frac{0.9271}{12}=\frac{0.9744}{b}

Do cross multiplication, we get

$0.9271b=11.6928

Divide by 0.9271 on both sides, we get

⇒ b = 12.61

Hence ∠B = 77°, a = 7.42 and b = 12.61.

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