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Lilit [14]
2 years ago
12

Help please , true or false question

Mathematics
2 answers:
wlad13 [49]2 years ago
5 0

Answer:

true

Step-by-step explanation:

mel-nik [20]2 years ago
5 0
True step by step tru
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Write each vector described below in component form and find its magnitude. Draw an arrow originating from (0,0) to
ElenaW [278]

Answer:

a = 3xi - 4yj              b = -6xj      c = -2xi + 2yj  d = 5xi  + 7yj

a ; b ; c ; d vectors

i and j   unit vectors

Step-by-step explanation:

See attached file

8 0
2 years ago
Just this please helppp
Murrr4er [49]

The height of the <em>water</em> depth is h = 14 + 6 · sin (π · t/6 + π/2), where t is in hours, and the height of the Ferris wheel is h = 21 + 19 · sin (π · t/20 - π/2), where t is in seconds. Please see the image to see the figures.

<h3>How to derive equations for periodical changes in time</h3>

According to the two cases described in the statement, we have clear example of <em>sinusoidal</em> model for the height as a function of time. In this case, we can make use of the following equation:

h = a + A · sin (2π · t/T + B)     (1)

Where:

  • a - Initial position, in meters.
  • A - Amplitude, in meters.
  • t - Time, in hours or seconds.
  • T - Period, in hours or seconds.
  • B - Phase, in radians.

Now we proceed to derive the equations for each case:

Water depth (u = 20 m, l = 8 m, a = 14 m, T = 12 h):

A = (20 m - 8 m)/2

A = 6 m

a = 14 m

Phase

20 = 14 + 6 · sin B

6 = 6 · sin B

sin B = 1

B = π/2

h = 14 + 6 · sin (π · t/6 + π/2), where t is in hours.

Ferris wheel (u = 40 m, l = 2 m, a = 21 m, T = 40 s):

A = (40 m - 2 m)/2

A = 19 m

a = 21 m

Phase

2 = 21 + 19 · sin B

- 19 = 19 · sin B

sin B = - 1

B = - π/2

h = 21 + 19 · sin (π · t/20 - π/2), where t is in seconds.

Lastly, we proceed to graph each case in the figures attached below.

To learn more on sinusoidal models: brainly.com/question/12060967

#SPJ1

5 0
1 year ago
Loren solved the equation 10 = StartFraction 19 Over 9 EndFraction (149) + b for b as part of her work to find the equation of a
Elden [556K]

The error that Loren made is C. She should have solved 149 = StartFraction 19 Over 9 EndFraction (10) + b for b.

<h3>What is an equation?</h3>

It should be noted that an equation is a statement that shows that two mathematical expressions are equal.

In this case, for Loren to find the slope, this will be:

m = y2 - y1/x2 - x1

= (149 - 130)/(10 - 1)

= 19/9

In this case, the error that Loren made is that she should have solved 149 = StartFraction 19 Over 9 EndFraction (10) + b for b.

Learn more about equations on:

brainly.com/question/13763238

#SPJ1

5 0
2 years ago
Solve for x<br> 45 degrees<br> 90 degrees<br> 65 degrees<br> 85 degrees
Mrrafil [7]

Answer:

x = 45

Step-by-step explanation:

x and (90 - x) are alternate exterior angles and are congruent , then

x = 90 - x ( add x to both sides )

2x = 90 ( divide both sides by 2 )

x = 45

5 0
1 year ago
Read 2 more answers
The sum of two numbers is 8. If three times the first number is equal to the second number, find the numbers.
MissTica

Step-by-step explanation:

Hi there,

The sum of two numbers is 8.

x + y = 8

If three times the first number

is equal to the second number.

3x = y

Replace the y in top equation with 3x

x + 3x = 8

4x = 8

x = 2

Substitute x = 2 in first equation

x + y = 8

2 + y = 8

y = 8 - 2

y = 6

{2,6}

Hope this helps :-)

5 0
2 years ago
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