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andreyandreev [35.5K]
3 years ago
5

Does anyone know the answer?

Mathematics
2 answers:
Helen [10]3 years ago
5 0
The answer would be 60, if you add 13,15, and 12 up you get 40. Those numbers would be considered 2/3 of all the marbles. Divide 40 by 2 to get how many marbles is 1/3. You would get 20 being a third if the marbles. Add that to the original 40 and you’ll get a total of 60.
ddd [48]3 years ago
5 0

Answer: 60

Step-by-step explanation:

Let R be number of red marbels

Let T be Total number of marbels in bag

Now,

T = 13 + 15 + 12 + R

T = 40 + R

Now,

Let P(R) be probability of getting red marble.

P(R) = R / T

1/3 = R / ( 40 + R )

40 + R = 3R

2R = 40

R = 20

So,

T = 40 + R

T = 40 + 20

T = 60

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Plz help with number 1
Trava [24]

In an isosceles triangle, the base angles are congruent. The third angle is called the vertex angle.

Here, the vertex angle is <A.

Therefore, m<C = m<B.

m<A = 3m<B + 20

m<A + m<B + m<C = 180

3m<B + 20 + m<B + m<B = 180

5m<B + 20 = 180

5m<B = 160

m<B = 32

m<C = m<B = 32

Answer: m<C = 32 deg

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2 years ago
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3 years ago
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IgorLugansk [536]

Answer:

option D is true.

Step-by-step explanation:

The right-angled triangle is shown.

From the right-angled triangle,

The angle Ф = 60°

We know that the trigonometric ratio

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  • adjacent = n

Thus,

tan 60 = 4 / n

√3 = 4/n

n = 4/√3

Thus,

n = 4/√3

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Thus,

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Using Pythagorean theorem

m = √n²+4²

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2 years ago
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Answer:

(-7,4]\text{ or }\{x|-7

Step-by-step explanation:

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Therefore, the domain is, in interval notation:

(-7,4]

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And in set notation, this is:

\{x|-7

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Combine like units.

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