3 years ago

The graph shows the processing speeds of computers as a function of time since 1980.

Mathematics

1 answer:

pochemuha3 years ago

3 0

The right anwser are C D E hope it helps :)

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Carlos received 84 votes. That was 3 of every 7 votes cast in the class president election. How many votes were cast?

Step2247 [10]

336 votes total.

if he got 84 votes 3/7 so you take 84 times 4 (i got four by subracting 3 from 7 and got the remaining votes) and you will get 336 votes. hope this helps! :)

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3 years ago

Can someone help me with this plz?

vredina [299]

I believe it is 21 and all so if u are having trouble in mathematics a good app to have is Pappa math algebraic calculator

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3 years ago

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If X squared equals 16 then X equals 4

AfilCa [17]

That would be correct because if x times x =16 than that means that the square root of 16 is 4

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4 years ago

WHAT IS NINE -9 PLUS TAN- 10?

GuDViN [60]

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3 years ago

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If for two non-zero vectors a,b : ∣a+b∣=∣a−b∣ then angle between them is:______a. 0b. 45c. 60d. 90

Eddi Din [679]

Answer:

$90^\circ$

Step-by-step explanation:

Given two non zero vectors, $\vec a, \vec b$ .

Let the angle between the two vectors = $\theta$

Given that:

$|\vec a+\vec b|=|\vec a-\vec b|$

Let us have a look at the formula for magnitude of addition of two vectors:

$|\vec x+\vec y|=\sqrt{x^2+y^2+2xycos\theta}$

Where $\theta$ is the angle between the two vectors.

formula for magnitude of subtraction of two vectors:

$|\vec x-\vec y|=\sqrt{x^2+y^2-2xycos\theta}$

As per the given condition:

$\sqrt{a^2+b^2+2abcos\theta}=\sqrt{a^2+b^2-2abcos\theta}$

Squaring both sides:

$a^2+b^2+2abcos\theta=a^2+b^2-2abcos\theta\\\Rightarrow 2abcos\theta=-2abcos\theta\\\Rightarrow cos\theta = -cos\theta\\\Rightarrow 2cos\theta = 0\\\Rightarrow cos\theta = 0\\\Rightarrow \theta = 90^\circ$

So, the angle between the two vectors is: $90^\circ$

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3 years ago