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meriva
2 years ago
13

Please help guys I will be helping u in the days to come n follow u for sure​

Mathematics
2 answers:
Leya [2.2K]2 years ago
4 0

Answer:

Step-by-step explanation:

\frac{cot \theta}{cosec \theta + 1} = \frac{cosec\theta -1} {cot \theta}

L H S

       \frac{cot \theta }{cosec \theta + 1 } \times \frac{cosec \theta - 1}{cosec \theta -1}             [  \ multiplying \ and \  dividng \ by  \ (cosec \theta - 1) \ ]

     =  \frac{cot \theta \times (cosec \theta - 1)}{(cosec ^2\theta -1)}                   [ \ (a -b)(a+b) = a^2 - b^2 \ ]

     =  \frac{cot \theta \times (cosec \theta - 1)}{cot^2 \theta}\\ \\                   [ \ cosec^2\theta  - 1 = cot^2 \theta \ ]

     = \frac{cosec \theta - 1 }{cot \theta} \\\\= RHS

   

                           

love history [14]2 years ago
3 0

Answer:

I'd 7587163850

Pass 123456

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3. If P (A) = 0.2 and P (B) = 0.3 and A and B are disjoint, what is P (A or B)?
Hitman42 [59]

Answer:  The calculations are below.

Step-by-step explanation:  The calculations are as follows:

(3) Given that for two events A and B,

P(A)=0.2,~~P(B)=0.3,~~P(A\cup B)=?

Since A and B are disjoint, so

A\cap B=\phi~~~~~\Rightarrow P(A\cap B)=0.

From the law of probability, we have

P(A\cup B)=P(A)+P(B)-P(A\cap B)=0.2+0.3-0=0.50.

Thus, the correct option is (E) 0.50.

(4) Given that a fair six-sided die is rolled. We are to find the probability that an odd number is rolled.

Let, 'A' be event of rolling an odd number. So,

A = {1, 3, 5}   ⇒ n(A) = 3.

Let 'S' be the sample space for the experiment. So,

S = {1, 2, 3, 4, 5, 6}   ⇒ n(S) = 6.

Therefore, the probability of rolling an odd number is given by

P(A)=\dfrac{n(A)}{n(S)}=\dfrac{3}{6}=\dfrac{1}{2}.

Thus, the correct option is (D) \dfrac{1}{2}.

(5) Given that there are 3 red marbles, 4 white marbles, and 1 green marble in a bag and marbles are drawn without replacement.

So, the probability that 3 marbles can be drawn without drawing the green marble is given by

P=\dfrac{7}{8}\times \dfrac{6}{7}\times \dfrac{5}{6}=\dfrac{5}{8}=0.625.

Thus, the correct option is (A) 0.625.

(6) The sample space for rolling a six-sided die is  {1, 2, 3, 4, 5, 6}

and the sample space for tossing a coin is {H, T}.

Therefore, the sample space for rolling a six-sided die and tossing a coin will be

S = {1H, 2H, 3H, 4H, 5H, 6H, 1T, 2T, 3T, 4T, 5T, 6T}.

Thus, the correct option is {1H, 2H, 3H, 4H, 5H, 6H, 1T, 2T, 3T, 4T, 5T, 6T}.

(7) Given that for two events A and B,

P(A)=0.2,~~P(B)=0.3,~~~P(A\cup B) =?

Since A and B are independent but not necessarily disjoint, so

P(A\cap B)=P(A)\times P(B)=0.2\times 0.3=0.06.

From the law of probability, we have

P(A\cup B)=P(A)+P(B)-P(A\cap B)=0.2+0.3-0.06=0.5-0.06=0.44.

Thus, the correct option is (C) 0.44.

(8) Given that three coins are tossed.

The sample space for each of them is S = {1, 2, 3, 4, 5, 6}.

The equally likely outcomes when three coins are tossed together are

{(1, 1 , 1), (2, 2, 2), (3, 3, 3), (4, 4, 4), (5, 5, 5), (6, 6, 6)}.

So, the total number of equally likely outcomes = 6.

Thus, the correct option is (C) 6.

Hence all the questions are answered.

7 0
3 years ago
Doris uses 6 square pieces of fabric to make one scarf. Each side of a square piece of fabric is one third yard in length. Doris
brilliants [131]

Answer:

5 large pieces of fabric.

Step-by-step explanation:

Length of each side of a square piece of fabric =\frac{1}{3} yard

Area of a Square = Length X Length

Area of one square piece of fabric = \frac{1}{3} X \frac{1}{3} =\frac{1}{9} square yard.

To make one scarf, Doris uses 6 square pieces.

Area of one scarf =  6 X \frac{1}{9}= \frac{6}{9}=\frac{2}{3} square yard

Each large pieces of fabric is one-third yard long and 2 yards wide.

This is clearly a rectangle,

Area of a Rectangle = Length X Width

Area of each large piece of fabric=\frac{1}{3}X 2=\frac{2}{3} square yard.

Since the Area of one scarf is equal to the area of each large piece of fabric, in order to make 5 scarves, Doris would need 5 large pieces of fabric.

7 0
2 years ago
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What does 74% of 160<br> Equal
Yuliya22 [10]

Answer:

Step-by-step explanation:

74% of 160 = 118.4

5 0
3 years ago
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What is the solution to 107 – (–25)
Over [174]

107 – (–25)

=107 + 25

= 132

Answer

132

8 0
3 years ago
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What is the range of a cosine function?
salantis [7]

Answer:

The sine and cosine functions have a period of 2π radians and the tangent function has a period of π radians. Domain and range: From the graphs above we see that for both the sine and cosine functions the domain is all real numbers and the range is all reals from −1 to +1 inclusive.

Step-by-step explanation:

6 0
3 years ago
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