3 years ago

Help I don't understand this

Mathematics

2 answers:

tatuchka [14]3 years ago

4 0

The answer is 57, since 16•8=128 and 128-71=57

Talja [164]3 years ago

3 0

The answer is 57 as 16•8 =128

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Mrrafil [7]

1. Line a and line b
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3. Ray WY and Ray WZ
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2 years ago

Question 8 Find the unit vector in the direction of (2,-3). Write your answer in component form. Do not approximate any numbers

slamgirl [31]

Answer:

The unit vector in component form is $\hat{u} = \left(\frac{2}{\sqrt{13} },-\frac{3}{\sqrt{13}} \right)$ or $\hat{u} = \frac{2}{\sqrt{13}}\,i-\frac{3}{13}\,j$ .

Step-by-step explanation:

Let be $\vec u = (2,-3)$ , its unit vector is determined by following expression:

$\hat {u} = \frac{\vec u}{\|\vec u \|}$

Where $\|\vec u \|$ is the norm of $\vec u$ , which is found by Pythagorean Theorem:

$\|\vec u\|=\sqrt{2^{2}+(-3)^{2}}$

$\|\vec u\| = \sqrt{13}$

Then, the unit vector is:

$\hat{u} = \frac{1}{\sqrt{13}} \cdot (2,-3)$

$\hat{u} = \left(\frac{2}{\sqrt{13} },-\frac{3}{\sqrt{13}} \right)$

The unit vector in component form is $\hat{u} = \left(\frac{2}{\sqrt{13} },-\frac{3}{\sqrt{13}} \right)$ or $\hat{u} = \frac{2}{\sqrt{13}}\,i-\frac{3}{13}\,j$ .

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2 years ago

Hannah wants to make a necklace for her best friend. She wants to use one hundred 1.7 mm beads, twenty-five 6.5 mm beads, and fi

lesya692 [45]

Answer:

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Step-by-step explanation:

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ZanzabumX [31]

Answer:

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Step-by-step explanation:

I think that because when you imagine it

you feel like it's between 155° and 160°

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2 years ago

10/21 + ( 2/3 - 1/7 ) =

Marizza181 [45]

Simplify 2/3 - 1/7 to 11/21
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Simplify
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2 years ago

Read 2 more answers