3 years ago

7x(3x2) and (7x3)x2

Mathematics

1 answer:

Elis [28]3 years ago

6 0

Answer:

what is the question

Step-by-step explanation:

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Let u = (1, 2 -2), v= (2, 1, 3) and w = j + 4k. a) Find cos theta, where theta is the angle in degrees between u and w.

vodka [1.7K]

Answer: The value of cos theta is -0.352.

Step-by-step explanation:

Since we have given that

$\vec{u}=1\hat{i}+2\hat{j}-2\hat{k}\and\\\\\vec{w}=\hat{j}+4\hat{k}$

We need to find the cos theta between u and w.

As we know the formula for angle between two vectors.

$\cos\ \theta=\dfrac{\vec{u}.\vec{w}}{\mid u\mid \mid w\mid}$

So, it becomes,

$\cos \theta=\dfrac{2-8}{\sqrt{1^2+2^2+(-2)^2}\sqrt{1^2+4^2}}\\\\\cos \theta=\dfrac{-6}{\sqrt{17}\sqrt{17}}=\dfrac{-6}{17}=-0.352\\\\\theta=\cos^{-1}(\dfrac{-6}{17})=110.66^\circ$

Hence, the value of cos theta is -0.352.

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3 years ago

What is the volume of a cube with a higher base and width of 4cm

katrin2010 [14]

<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ Volume = height x base x width

Volume = 4 x 4 x 4

Volume = 64

The volume is 64cm^2

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

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3 years ago

Look at photo asap please <br><br><br><br><br><br><br>

aivan3 [116]

Answer:

option D is correct.

hope it helps

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3 years ago

Issac has 18 eggs. He is packing cartons with 1/3 of his eggs of carton?

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He us filling it with 6 eggs

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The consumption of cigarettes in the United States is declining. if t represents the number of years since 1990, then the consum

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I think you should google cigarettes and you’ll get the answer

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3 years ago

7x(3x2) and (7x3)x2​

7x(3x2) and (7x3)x2