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3 years ago

I need help with this probelm please

Mathematics

1 answer:

prohojiy [21]3 years ago

6 0

The answer is 28 bookmarks!! 23+5=28

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Which expression is the best estimate of the product of 7/8 and 1/10

Lera25 [3.4K]

Multiply across 7/80

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3 years ago

The difference of 5 and 5 math

Nadusha1986 [10]

Answer:

5-5=0

Step-by-step explanation:

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3 years ago

Karen paid $43.70 for a book. The price of the book was $40. What was the sales tax rate?

dimaraw [331]

Price before tax = $40

Price after tax = $43.70

Sales Tax = $43.70 = $40 = $3.70

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4 years ago

What is the GCF of 42 and 48

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3 years ago

How do i figure out these problems ?

Andreyy89

Given two vectors

$v=(a,b),\quad w=(c,d)$

they are parallel if they are a multiple of each other:

$c=ka,\quad d=kb$

You can easily test this by checking if

$\dfrac{c}{a}=\dfrac{d}{b}$

they are orthogonal if their dot product is null:

$v\cdot w=ac+bd=0$

For example, in the first case, we have

$\dfrac{10}{3}\div 2 \neq \dfrac{4}{3}\div 5$

So, they aren't parallel. Similarly, you have

$2\cdot \dfrac{10}{3}+5\cdot \dfrac{4}{3}\neq 0$

So, they aren't orthogonal.

In the second case, we have

$\dfrac{5}{-12}\neq \dfrac{-6}{-10}$

So, they aren't parallel, and

$5(-12)+(-6)(-10)=-60+60=0$

So, they are orthogonal.

Finally, we have

$\dfrac{2}{-4}=\dfrac{-7}{14}=-\dfrac{1}{2}$

So, they are parallel (and thus can't be orthogonal)

7 0

3 years ago