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konstantin123 [22]
3 years ago
9

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°.

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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

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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:

30

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
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x represents the total snacks and y represents the total rides

Standard form: Ax + By = C

In this case,

5x + 2y = 23

4 0
3 years ago
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Choose correct way to write three dollars and seventeen cents using the dollar symbol.
polet [3.4K]

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$3.17

Step-by-step explanation:

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