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3 years ago

In the diagram below, BD <-> is parallel to XY<-> . What is the value of y?

Mathematics

2 answers:

Veronika [31]3 years ago

8 0

Your answer would be A.83

Alona [7]3 years ago

3 0

I think it would be equal to D. BD and XY are equal so you can match the values.

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Anyone know this ? picture shown please help

valina [46]

They're just after some straightforward algebra starting from the Law of Cosine. We don't have to evaluate any trig functions or anything like that.

$c^2 = a^2 + b^2 - 2ab \cos C$

We move the c² and the cosine term to their other sides,

$2ab \cos C = a^2 + b^2- c^2$

That's it for the algebra.

a,b and c are the side lengths opposite A,B and C respectively. So a=4, b=5, c=2.

We substitute:

$2ab \cos C = 4^2 + 5^2- 2^2 = 16 + 25 - 4 = 37$

Answer: A. 37

5 0

3 years ago

Material for a dress costs £5.50 per metre. find the cost of 10cm and 70cm

Zielflug [23.3K]

Answer:

The cost of 10 cm and 70 cm are £0.55 and £3.85 respectively.

Step-by-step explanation:

Material for a dress costs £5.50 per meter.

We know that, 1 meter = 100 cm.

Suppose, the cost of 10 cm material is $x$ and the cost of 70 cm material is $y$

Now, according to the ratio of "cost" to the "length of material" , we will get.......

$\frac{x}{10} =\frac{5.50}{100}\\ \\ 100x=10*5.50=55\\ \\ x=\frac{55}{100}=0.55$

and

$\frac{y}{70} =\frac{5.50}{100}\\ \\ 100y=70*5.50=385\\ \\ x=\frac{385}{100}=3.85$

So, the cost of 10 cm material is £0.55 and the cost of 70 cm material is £3.85

5 0

3 years ago

Identify proportional realationships from graphs There’s also a none option

kkurt [141]

Answer:

B is one is there anymore options

Step-by-step explanation:

3 0

2 years ago

Need help :((((((((((

Ksivusya [100]

The correct answer is D. 2s + 3

Hope this helps!

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3 years ago

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Kaya had a string 6 1/8 inches long. She cut off a piece 2 3/4 inches long. How long is the remaining piece of string? Show your

Katen [24]

Answer: 3 3/8

Step-by-step explanation:

We know that for example 2/4=4/8 so it is multiplied by 2. In this problem the fractions are 2 2/4 and 6 1/8. We are subtracting so you would first multiply the fraction that’s going to subtracted from the other fraction 2 3/4= 2 6/8. Now that we have our fractions we can subtract 6 1/8-2 6/8 this would leave us with 3.375 which is equal to 3 3/8.

4 0

2 years ago

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