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3 years ago

Help math help plzz no links or imma report u . Helps 20 points

Mathematics

1 answer:

PSYCHO15rus [73]3 years ago

6 0

Answer:

its c .

Step-by-step explanation: :)

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Vector question. Let v=<-2,1> u=<3,-5> , find:

lyudmila [28]

Answer:

1. ) $\vec {v}.\vec{u}= -11$

2.) The angle between v and u is 147.52°.

Step-by-step explanation:

Given:

$\vec {v}= ( -2 , 1 )\\\vec {u}= ( 3 , -5 )$

To Find:

1. $\vec {v}.\vec{u}= ?$

2. $\theta = ?$

Solution:

$\vec {v}.\vec{u}$ is scalar product given as,

$\vec {v}.\vec{u}=|\vec {v}||\vec {u}|\cos \theta$

$|\vec {v}|=|(-2, 1)|=\sqrt{(-2)^{2} +1^{2}}=\sqrt{5}\\|\vec {u}|=|(3, 5)|=\sqrt{(3)^{2} +(-5)^{2}}=\sqrt{34}$

$\vec {v}.\vec{u}=(-2i +j).(3i-5j)\\$

Here only i.i = j.j =1 and i.j = j.i = 0

∴ $\vec {v}.\vec{u}=(-2\times 3 +1\times -5)\\\vec {v}.\vec{u}=-6-5=-11 \\$

Now, Substituting the above values we get

$-11=\sqrt{5}\times \sqrt{34}\cos \theta\\ \cos \theta=\frac{-11}{\sqrt{170}} \\ \cos \theta =-0.84366\\\therefore \theta =cos^{-1}(-0.84366)\\\therefore \theta =147.52\°$

As it is negative mean $\theta$ is in Second Quadrant Because Cosine is negative in Second Quadrant.

1. ) $\vec {v}.\vec{u}= -11$

2.) The angle between v and u is 147.52°.

5 0

3 years ago

I will give brainliest Please answer

faust18 [17]

Answer:

Step-by-step explanation:

1) 9 x 4 = 36

9 + 4 = 13

2) 9 x -4 = -36

9 + (-4) = 5

3) 4 x3 = 12

4+ 3 = 7

4) -4 x 3 = -12

-4 + 3 = -1

8 0

3 years ago

Five girls in a homeroom class of 20 students have blonde hair. If there are 120 students in the school, how many would you pred

frozen [14]

Answer:

Step-by-step explanation:

120 / 20 = 6

5 × 6 = 30

30 blonde haired girls

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3 years ago

Plz help show all work

s344n2d4d5 [400]

x represents the total snacks and y represents the total rides

Standard form: Ax + By = C

In this case,

5x + 2y = 23

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3 years ago

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Choose correct way to write three dollars and seventeen cents using the dollar symbol.

polet [3.4K]

Answer:

$3.17

Step-by-step explanation:

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3 years ago