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2 years ago

In ABC, angle C is a right angle. Which statement must be true

Mathematics

1 answer:

KatRina [158]2 years ago

4 0

Answer:

Step-by-step explanation:

a because the the sin is opposite divided by hypotenuse and the opposite of a is 12 and the hypotenuse is 13 so sin a would be 12/13

this is equals to the cosine of b because cos is adjacent/hypotenuse and the adjacent of b is 12 and the hypotenuse is 13 so cos b would be 12/13

hope this helps :)

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An urn contains 12 balls, of which 4 are white.

wel

Answer:

a) $\frac{1}{3}$

b) $\frac{4}{12}\,,\,\frac{4}{11}\,,\,\frac{4}{10}\,,...$

Step-by-step explanation:

Number of balls in the urn = 12

Number of white balls in the urn = 4

So, number of balls which are not white = 12 - 4 = 8

We know that probability = No. of outcomes/Total number of outcomes

Let $A_i\,,\,B_i\,,\,C_i$ denotes the event of getting white ball by A, B and C

a) each ball is replaced after being drawn.

Probability = Number of white balls/Total number of balls

Solution: $P(A_i)=P(B_i)=P(C_i)=\frac{4}{12}=\frac{1}{3}$

b)the balls that are withdrawn are not replaced.

Solution:

If A wins: $P(A_1)=\frac{4}{12}=\frac{1}{3}$

If A lost and B wins: $P\left ( B_1|A_1^{c} \right )=\frac{4}{11}$

If A and B lost and C wins: $P\left ( C_1|A_1^{c}\,B_1^{c} \right )=\frac{4}{10}$

and so on....

4 0

3 years ago

Whitch equation is related to this equation? k divided by 4=13

OlgaM077 [116]

$k:4=13\\\\\dfrac{k}{4}=13\ \ \ \ |multiply\ both\ sides\ by\ 4\\\\k=52$

6 0

3 years ago

Help!!?????? Plssssss

zhannawk [14.2K]

Answer:

1st row- 27

2nd row- 18, 48

3rd row- 55

8 0

2 years ago

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Fraction Questions:

bagirrra123 [75]

Answer:

Step-by-step explanation:

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1 year ago

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9. If y = 30 when x = 7, find x when y = 12.

Marianna [84]

I have my work at the bottom but to explain you have to divide 30/12, and I got 2.5. That means 30 is 2.5 times bigger than 12. Because we have to find x, we have to divide 7/2.5, to find what is 2.5 times smaller than 7. That’s 2.8. So, x= 2.8

6 0

2 years ago