1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
OlgaM077 [116]
3 years ago
12

Kind people!help me please...And a detailed solution/THANKS sin^2x-0,5sin2x=0

Mathematics
1 answer:
Volgvan3 years ago
8 0

This will be easier to write, and a lot easier to read, if we temporarily
use another symbol ... say, 'Q' ... to represent  ' sin(2x) ' .
Here we go:

Original equation:                Q² - 0.5 Q  =  0

Factor the left side:            Q (Q - 0.5)  =  0

This equation is true if either factor is zero:


--  If  Q=0, then  sin(2x) = 0

                                 2x = 0°,  180°,  360°

                                   x = 0°,  90°,  180°


-- If  (Q-0.5) = 0, then      Q  =  0.5

                                sin(2x)  =  0.5          

                                       2x  =  30°,  150°

                                         x  =  15°,  75°


The whole collection of solutions
between  0°  and  360° :

          x = 0°,  15°,  75°,  90°,  180° .

You might be interested in
The percentage of people under the age of 18 was 23.5% in New York City, 25.8% in Chicago, and 26% in Los Angeles.
Hatshy [7]

Answer:

0.0158 = 1.58% probability that all of them are under 18.

Step-by-step explanation:

Probability of independent events:

If three events, A, B and C are independent, the probability of all happening is the multiplication of the probabilities of each happening, that is:

P(A \cap B \cap C) = P(A)P(B)P(C)

The percentage of people under the age of 18 was 23.5% in New York City, 25.8% in Chicago, and 26% in Los Angeles.

This means that P(A) = 0.235, P(B) = 0.258, P(C) = 0.26

If one person is selected from each city, what is the probability that all of them are under 18?

Since the three people are independent:

P(A \cap B \cap C) = 0.235*0.258*0.26 = 0.0158

0.0158 = 1.58% probability that all of them are under 18.

8 0
3 years ago
In a certain year, when she was a high school senior, Idonna scored 671 on the mathematics part of the SAT. The distribution of
goldfiish [28.3K]

Answer:

Idonna's standardized score is 1.41.

Jonathan's standardized score is 0.55.

A.) Idonna's score is higher than Jonathan's

Step-by-step explanation:

Z-score:

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Idonna scored 671 on the mathematics part of the SAT. The distribution of SAT math scores in that year was Normal with mean 509 and standard deviation 115.

This means that her standardized score is Z when X = 671, \mu = 509, \sigma = 115. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{671 - 509}{115}

Z = 1.41

Idonna's standardized score is 1.41.

Jonathan took the ACT and scored 24 on the mathematics portion. ACT math scores for the same year were Normally distributed with mean 21.1 and standard deviation 5.3 .

This means that his standardized score is Z when X = 24, \mu = 21.1, \sigma = 5.3

Z = \frac{X - \mu}{\sigma}

Z = \frac{24 - 21.1}{5.3}

Z = 0.55

Jonathan's standardized score is 0.55.

Due to the higher z-score, Iddona's has a higher score.

5 0
2 years ago
Everyone please answer one of these my birthday tuesday but i might be in trouble if i fail this :(
Andreas93 [3]

Answer:

11. b

10.d

9.c

7.b

1.d

the rest I can't see clearly

please give brainiest

Step-by-step explanation:

11.

3/x-4=7/x

*cross multiply

3x=7 (x-4)

3x=7x-28

28=7x-3x

28=4x

x=7

10.

SOHCAHTOA

Cos☆=11/14

cos^-1 (11/14)

☆=38.21 degrees

9.

MLN CONGRUENT TO WBN

ML/WB=LN/BN=MN/WN

LN/BN=10/6

ML/WB

24/x=10/6

24x6=10x

144÷10

=14.4

6^2+14.4^2

=243.36

squareroot

=15.6

8 0
2 years ago
Can someone please help
Rzqust [24]
Answer: D

When you multiply out the fraction it gives you (3/2)x + 7/4
4 0
3 years ago
Read 2 more answers
Determine whether the underlined value is a parameter or a statistic.
hram777 [196]

Since the value is taken from a population, the value is a parameter.

<h3>Parameter and Statistic:</h3>

  • If the information is taken from a sample, it is called a statistic.
  • If the information is taken from a population, it is called a parameter.

For this problem, the students of the class are the population, as all students are considered for the calculator of the mean, hence the value is a parameter.

More can be learned about parameter and statistic at brainly.com/question/26118332

#SPJ1

4 0
1 year ago
Other questions:
  • What is the y intercept of 5
    5·2 answers
  • What is (34) plus 70-35 equal
    15·2 answers
  • What is the answer for 4a+2b=16
    12·1 answer
  • Find an exact value cos 75°
    7·2 answers
  • Ethan's solution and reasoning for solving an equation are shown below: 4/2 x - 10 =30
    13·2 answers
  • Okay these last two are the last ones i need help on!
    7·1 answer
  • Write the equation of the circle whose center is (-4,8) and has a diameter of 18
    13·1 answer
  • The Angle of depression from the top of the flagpole to an object on the ground it's 33° if the object is 60 feet from the base
    5·1 answer
  • Enter the symbol (&lt;, &gt;, or =) that correctly completes this comparison.<br> 0.147 0 0.174
    5·1 answer
  • Is the answer 2 to this question?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!