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3 years ago

How to solve this question?

Mathematics

1 answer:

fiasKO [112]3 years ago

6 0

Hi!

For this equation, you can solve it by using the quadratic formula:
x=-b<span>±sqrt/b^2-4ab
-----------------------
2a</span>

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Suppose there are 21 students in your class. If the teacher draws 2 names at random, what is the probability that you and your b

natali 33 [55]

1/21 * 1/20 = 1/420 that is the probability that you are chosen first.
Probability of your friend chosen first = 1/420 also.

So the required probability = 1/420 + 1/420 = 1/210 Answer

Its D

7 0

3 years ago

Please help ASAP first to answer correctly gets brainlyist

Anna11 [10]

Median means middle. How you solve this is by first putting the numbers in order from least to greatest:

36 41 43 45 46 48 48 51 51 52

Now that it is in order in each "level" take away the smallest and largest number until you get to the middle

36 41 43 45 46 48 48 51 51 52

41 43 45 46 48 48 51 51

43 45 46 48 48 51

45 46 48 48

46 48

Now this is a bit tricky because there isn't one number to signify the exact middle. When you have two numbers left you must take the mean of those two numbers. This means that you add the two numbers left and then divide the answer by 2:

46 + 48 = 94

94 ÷ 2 = 47

Hope this helped!

5 0

3 years ago

What is the length of line segment RS? Use the law of sines to find the answer. Round to the nearest tenth. Law of sines:

Leno4ka [110]

Answer:

Correct Answer is B. 2.4 Units

Step-by-step explanation:

The missing picture in question is attached.

The Law of Sines is given as:

$\frac{Sin(A)}{a} = \frac{Sin (B)}{b} = \frac{Sin (C)}{c}$

Where,

a,b,c are the length of sides of triangle

A,B,C are the angles between the two sides of triangle

According to the picture attached, we have ΔRQS,

Let,

r = 3.1 units

R = 80°

s = 2.4 units

S = S

q = RS

Q = Q

Using law of Sines:

$\frac{Sin (R)}{r} = \frac{Sin (S)}{s}\\ \frac{Sin (80)}{3.1} = \frac{Sin (S)}{2.4} \\Sin (S) = \frac{Sin (80)}{3.1} * 2.4\\Sin (S) = 0.762\\S = Sin^{-1} (0.762) \\S = 49.68$ °

Since, triangle is constitute of total 180°, hence,

∠Q + ∠R + ∠S = 180°

∠Q + 80 + 49.68 = 180

∠Q = 180 - 80 - 49.68

∠Q = 50.32°

To find line segment RS, again use law of sines: $\frac{Sin (R)}{r} = \frac{Sin (Q)}{q}\\\frac{Sin (80)}{3.1} = \frac{Sin (50.32)}{RS}\\0.3177 = \frac{0.77}{RS}\\RS = 2.42 Units$