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
sdas [7]
3 years ago
12

Only one question pls help

Mathematics
1 answer:
lina2011 [118]3 years ago
4 0

Cos x = 5 / 9 ==》 Cos x = 0.55

==》 x = 56 degrees

You might be interested in
51 times the difference between a number and 21 is equal to the number plus 58.
Lerok [7]

51(x - 21) = x + 58

<em><u>Distributive property</u></em>

51x - 1071 = x + 58

<em><u>Subtract x from both sides</u></em>

50x - 1071 = 58

<em><u>Add 1071 to both sides</u></em>

50x = 1129

<em><u>Divide both sides by 50</u></em>

x = 22.58


7 0
3 years ago
arcus had 8/9 of a pack of construction paper. he used 1/5 of the paper to make paper airplanes. what fraction of the original p
vovikov84 [41]
Take and do 8/9 - 1/5 which gives u 40/9which equals 4 4/9.
4 0
3 years ago
Body armor provides critical protection for law enforcement personnel, but it does affect balance and mobility. The article "Imp
yKpoI14uk [10]

Answer:

No, there is not enough evidence to support the claim that true average task time with armor is less than 2 seconds.

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that true average task time with armor is less than 2 seconds.

Then, the null and alternative hypothesis are:

H_0: \mu=2\\\\H_a:\mu< 2

The significance level is 0.01.

The sample has a size n=52.

The sample mean is M=1.95.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=0.2.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{0.2}{\sqrt{52}}=0.028

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{1.95-2}{0.028}=\dfrac{-0.05}{0.028}=-1.803

The degrees of freedom for this sample size are:

df=n-1=52-1=51

This test is a left-tailed test, with 51 degrees of freedom and t=-1.803, so the P-value for this test is calculated as (using a t-table):

P-value=P(t

As the P-value (0.039) is bigger than the significance level (0.01), the effect is not significant.

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that true average task time with armor is less than 2 seconds.

3 0
3 years ago
You and your friend play a video game. You have a final score of 40 points, and your friend has a final score of -21 points. by
Serhud [2]

Answer:40+(-21)= 19

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Free points: this is because of all the kindness I have seen on brainly:
const2013 [10]

Answer:

10x10= 100

Step-by-step explanation:

thx for the points

hope you have a wonderful dayyy

3 0
3 years ago
Read 2 more answers
Other questions:
  • What is the answer to the problem
    8·1 answer
  • The square of 9 less than a number is 3 less than the number. What is the number?
    10·2 answers
  • Which statement best illustrates the theories of Prince Klemens von Metternich?
    13·1 answer
  • Solve : -0.375c - 11 = 13<br><br> please help me and thank youu :)
    11·2 answers
  • Suppose that y varies directly with x and y = 10 when x = 20. What is y when x = 15?
    15·1 answer
  • -5(t + 3)= -30<br> Solve for the variable!! Please
    14·1 answer
  • HELP ME PLEASEEEEEEEEEEEEEEEEEEEEEEEEEEE
    13·1 answer
  • How many one-tenths are in two-fifths?
    10·2 answers
  • (a) Reflect the point (-8, -6)<br> across the x-axis
    13·1 answer
  • Someone please answer this, I would really be appreciative.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!