Answer:
11
n²
Step-by-step explanation:
Given
= 
× 
× 
= 11 × × n²
= 11n²
The answer should be b according to me
Answer: Choice D)
The angle between the two vectors is approximately 71.6 degrees
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Work Shown:
Each time I write the word "dot" I mean "dot product".
|u| = length of vector u
|u| = sqrt(u dot u)
|u| = sqrt(<8,4> dot <8,4>)
|u| = sqrt(8*8 + 4*4)
|u| = sqrt(64 + 16)
|u| = sqrt(80)
|u| = sqrt(16*5)
|u| = sqrt(16)*sqrt(5)
|u| = 4*sqrt(5)
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|v| = length of vector v
|v| = sqrt(v dot v)
|v| = sqrt(<9,-9> dot <9,-9>)
|v| = sqrt(9*9 + (-9)*(-9))
|v| = sqrt(81+81)
|v| = sqrt(2*81)
|v| = sqrt(2)*sqrt(81)
|v| = sqrt(2)*9
|v| = 9*sqrt(2)
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u dot v = <8,4> dot <9,-9>
u dot v = 8*9 + 4*(-9)
u dot v = 72-36
u dot v = 36
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cos(theta) = (u dot v)/(|u|*|v|)
cos(theta) = (36)/(4*sqrt(5)*9*sqrt(2))
cos(theta) = (36)/(36*sqrt(10))
cos(theta) = 1/(sqrt(10))
cos(theta) = sqrt(10)/10
theta = arccos(sqrt(10)/10)
theta = 71.56505
which rounds to 71.6 when rounding to one decimal place (nearest tenth)
That's why the approximate answer is roughly 71.6 degrees
Answer: <em>23 1/24 CM.</em>
-- <u><em>I hope you stay safe and extra healthy. Don't let those annoying hands of yours touch your germ-free face! Make sure to wash your hands extra this time and use a lot of PURELL, just, don't dry your hands out, so, make sure you have enough hand lotion. Hope this helped! (Also, masks are great! Don't use gloves because you put germs on the gloves, then, when you take them off, you touch the germs that were on your gloves.)</em></u><em> </em>
<em />
<em> ~ </em><u><em>Mattie</em></u>
Answer:
yes
Step-by-step explanation:
it sounds good to me
