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cluponka [151]
2 years ago
9

Answer Please VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV

Mathematics
1 answer:
mash [69]2 years ago
6 0

Answer:

Step-by-step explanation:

D =\left[\begin{array}{cc}8&-4\\-14&12\end{array}\right] -\left[\begin{array}{cc}-1&-15\\0&7\end{array}\right] \\\\\\\\=\left[\begin{array}{ccc}8+1&-4+15\\-14-0&12-7\end{array}\right]\\\\\\=\left[\begin{array}{ccc}9&11\\-14&5\end{array}\right]

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It takes Fred 32 minutes to type and spell check 5 pages of a manuscript. Find how long it takes
sveta [45]

Answer:

26

Step-by-step explanation:

we \: rounded \: it \: to \: the \: nearest \: whole \: number

6 0
2 years ago
How can refusal skills help you to avoid danger?
gayaneshka [121]

Answer:

Children who are taught refusal skills are more likely to make positive choices and refrain from engaging in high-risk behaviors

Step-by-step explanation:

5 0
2 years ago
A buoy floating in the sea is bobbing in simple harmonic motion with period 2 seconds and amplitude 8 in. Its displacement d fro
Mrac [35]

Answer:

The equation of the displacement d as a function of time t is :

d(t)=8sin(\pi t+\pi )

Step-by-step explanation:

Generally , A simple harmonic wave is a sinusoidal function that is it can be expressed in simple sin or cos terms.

Thus,

d(t) = Asin(wt+c)

is the general form of displacement of a SHM.

where,

  • <em>d(t) is the displacement with respect to the mean position at any time t</em>
  • <em>A is amplitude </em>
  • <em>w is the natural frequency of oscillation (rads^{-1})</em>
  • <em>c is the phase angle which indicates the initial position of the object in SHM (rad)</em>

given,

  1. Time period (T) = 2s
  2. A=8
  3. The natural frequency (w) and time period (T) is :

                               w=\frac{2\pi} {T}

∴

w = \frac{2\pi }{2}  = \pi rads^{-1}

∴

the equation :

<em>⇒d(t)=8sin(\pi t+c)    </em>                    ------1

since d=0 when t=o ,

<em>⇒0=8sinc\\c=n\pi                         ------2</em>

where n is an integer ;

<u>⇒since the bouy immediately moves in the negative direction , x must be negative or c must be an odd multiple of \pi.</u>

<em>⇒ d(t) = 8sin(\pi t+(2k+1)\pi )         ------3</em>

where k is also an integer ;

the least value of k=0;

thus ,

the equation is :

d(t)=8sin(\pi t+\pi )

<em></em>

7 0
2 years ago
If a+b=5 and a-b=4 then b^2-a^2 =
Anna007 [38]

Answer:

a + b = 5 \\ a \:  = 5 - b \\  a - b = 4 \\ 5 - b - b = 4 \\ 5 - 2b = 4 \\ 5 - 4 = 2b \\ 1 = 2b \\  \frac{1}{2}  =  \frac{2b}{2}  \\0.5 = b \\  b = 0.5 \\ a = 5 - b \\  = 5 - 0.5 \\  = 4.5 \\  {a \: }^{2}  -  {b}^{2}  = ( {4.5}^{2})  - (  {0.5}^{2} )  \\  = 20.25 - 0.25 \\  = 20 \\  {a}^{2}  -  {b}^{2}  = 20

Step-by-step explanation:

HOPE THAT THIS IS HELPFUL.

HAVE A GREAT DAY.

5 0
2 years ago
A line has a slope of 5 and passes through the point (-1,2).
Andreyy89

Answer:

Step-by-step explanation:

slope=m= 5

points=(-1,2)

<u>By point-slope form:</u>

y-y_{1}=m(x-x_{1})

<u>Substitute the values in formula:</u>

<u>y-2=5(x+1)</u>        (It is the point slope form)

Now,

<u>Slope intercept form:</u>

y-2=5x+5

y=5x+5+2

<u>y=5x+7</u>

<u />

<h3><u>If you need to ask any questions, please let me know.</u></h3>
5 0
3 years ago
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