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grigory [225]
3 years ago
15

How to be best in math?

Mathematics
1 answer:
djyliett [7]3 years ago
6 0
You must practice maths every day. Practice more and more sums which you have find difficulties.
Means you have to practice, practice and practice.
Practice makes a man perfect.
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Find two unit vectors orthogonal to both given vectors. i j k, 4i k
Maurinko [17]
The cross product of two vectors gives a third vector \mathbf v that is orthogonal to the first two.

\mathbf v=(\vec i+\vec j+\vec k)\times(4\,\vec i+\vec k)=\begin{vmatrix}\vec i&\vec j&\vec k\\1&1&1\\4&0&1\end{vmatrix}=\vec i+3\,\vec j-4\,\vec k

Normalize this vector by dividing it by its norm:

\dfrac{\mathbf v}{\|\mathbf v\|}=\dfrac{\vec i+3\,\vec j-4\,\vec k}{\sqrt{1^2+3^2+(-4)^2}}=\dfrac1{\sqrt{26}}(\vec i+3\,\vec j-4\vec k)

To get another vector orthogonal to the first two, you can just change the sign and use -\mathbf v.
6 0
3 years ago
Jacob took out a loan for $5,400 at a simple interest rate of 3.5% for 6 months. How much interest did he owe?
puteri [66]

Answer:

c

Step-by-step explanation:

I don't trust myself so I am sorry if it is wrong

4 0
3 years ago
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What is the slope of a line that is perpendicular to the graph of y=-3x?
lutik1710 [3]
<span>y=-3x has slope = -3
</span><span>
perpendicular lines, slope is opposite and reciprocal
so slope of </span>perpendicular  = 1/3

answer
1/3
5 0
3 years ago
Zoe has a collection of 78 movies, costing $29.99 each. How much did Zoe spend on all her movies?
shepuryov [24]
Zoe spend $2339.22 because you just need to multiply the given
5 0
3 years ago
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What number makes the equation true?<br> + 13 = 47
olga_2 [115]

Answer:

x=34

Step-by-step explanation:

Just take 47-13=34

7 0
3 years ago
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