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
Alika [10]
3 years ago
11

Cindy is facing South through how many degrees should she turn clockwise to face East? a. 90° b. 180° c. 270° d. 360° e. Other:

Mathematics
1 answer:
julia-pushkina [17]3 years ago
4 0

Answer:

90°

Step-by-step explanation:

because from south to east is half of north which makes it 90°

You might be interested in
Find the function y1 of t which is the solution of 121y′′+110y′−24y=0 with initial conditions y1(0)=1,y′1(0)=0. y1= Note: y1 is
strojnjashka [21]

Answer:

Step-by-step explanation:

The original equation is 121y''+110y'-24y=0. We propose that the solution of this equations is of the form y = Ae^{rt}. Then, by replacing the derivatives we get the following

121r^2Ae^{rt}+110rAe^{rt}-24Ae^{rt}=0= Ae^{rt}(121r^2+110r-24)

Since we want a non trival solution, it must happen that A is different from zero. Also, the exponential function is always positive, then it must happen that

121r^2+110r-24=0

Recall that the roots of a polynomial of the form ax^2+bx+c are given by the formula

x = \frac{-b \pm \sqrt[]{b^2-4ac}}{2a}

In our case a = 121, b = 110 and c = -24. Using the formula we get the solutions

r_1 = -\frac{12}{11}

r_2 = \frac{2}{11}

So, in this case, the general solution is y = c_1 e^{\frac{-12t}{11}} + c_2 e^{\frac{2t}{11}}

a) In the first case, we are given that y(0) = 1 and y'(0) = 0. By differentiating the general solution and replacing t by 0 we get the equations

c_1 + c_2 = 1

c_1\frac{-12}{11} + c_2\frac{2}{11} = 0(or equivalently c_2 = 6c_1

By replacing the second equation in the first one, we get 7c_1 = 1 which implies that c_1 = \frac{1}{7}, c_2 = \frac{6}{7}.

So y_1 = \frac{1}{7}e^{\frac{-12t}{11}} + \frac{6}{7}e^{\frac{2t}{11}}

b) By using y(0) =0 and y'(0)=1 we get the equations

c_1+c_2 =0

c_1\frac{-12}{11} + c_2\frac{2}{11} = 1(or equivalently -12c_1+2c_2 = 11

By solving this system, the solution is c_1 = \frac{-11}{14}, c_2 = \frac{11}{14}

Then y_2 = \frac{-11}{14}e^{\frac{-12t}{11}} + \frac{11}{14} e^{\frac{2t}{11}}

c)

The Wronskian of the solutions is calculated as the determinant of the following matrix

\left| \begin{matrix}y_1 & y_2 \\ y_1' & y_2'\end{matrix}\right|= W(t) = y_1\cdot y_2'-y_1'y_2

By plugging the values of y_1 and

We can check this by using Abel's theorem. Given a second degree differential equation of the form y''+p(x)y'+q(x)y the wronskian is given by

e^{\int -p(x) dx}

In this case, by dividing the equation by 121 we get that p(x) = 10/11. So the wronskian is

e^{\int -\frac{10}{11} dx} = e^{\frac{-10x}{11}}

Note that this function is always positive, and thus, never zero. So y_1, y_2 is a fundamental set of solutions.

8 0
2 years ago
If two events have probabilities which sum to 1, they are called _ _ _ _ _ _ _ _ _ _ _ _ _ events​
Tom [10]

Answer:

An event with probability 0 never occurs. An event with probability 1 occurs on every trial

Step-by-step explanation:

3 0
3 years ago
A coin and a dice are tossed at the same time. ​
Aleksandr-060686 [28]

Answer:

H1, H2, H3, H4, H5, H6, T1, T2, T3, T4, T5, T6

1/12

Step-by-step explanation:

ive done this

4 0
3 years ago
According to a survey of college students, the use of social media varies widely according to age. Based on the survey, what is
Yanka [14]

Answer:

C. 65

Step-by-step explanation:

The table which shows the results of the survey are attached below.

From the table:

  • Total Number of non-social media users = 71
  • Number of non-social media user aged 28 and up = 46

Therefore, the probability that a non-social media user is an older student aged 28 and up

=\dfrac{\text{ Number of non-social media user aged 28 and up}}{\text{ Total Number of non-social media users}}\\\\=\dfrac{46}{71} \times 100\\\\=64.7\\\\\approx 65\%

The probability that a non-social media user is an older student aged 28 and up is 65%.

<u>The correct option is C. </u>

4 0
3 years ago
Nancy’s grandma needs 5/8
Gre4nikov [31]

Answer:16

Step-by-step explanation:

10÷5/8=16

6 0
2 years ago
Other questions:
  • Analyze the diagram below and complete the instructions that follow.
    15·1 answer
  • Charlie used one and two thirds cups of walnuts and two and one sixth cups of cranberries to make breakfast bread.How many cups
    5·1 answer
  • EMERGENCY please help thank you !!!!
    8·2 answers
  • PLEASE HELP ME I NEED IT QUICK I WILL GIVE BRAINLIEST
    12·1 answer
  • Is a square always a quadrilateral
    7·2 answers
  • 2. "three times the sum of a number and 7”.
    8·2 answers
  • NEED HELP ASAP!!! 50 POINTS!!! WILL MARK BRAINLIEST
    7·1 answer
  • What is the product of 6 and one-half and 9 and one-fourth? 15 and three-fourths 54 and StartFraction 1 Over 8 EndFraction 60 an
    5·1 answer
  • The pentagon on the left is a reflection of the pentagon on the right.
    8·1 answer
  • Riley has completed 6 of the 30 pages she was assigned for homework. What percentage of her homework does Riley have left to com
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!