3 years ago

Will mark brainliest!! Please help asap!!

Mathematics

1 answer:

Anna007 [38]3 years ago

8 0

Answer:

the answer is A

Step-by-step explanation:

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Consider two vectors A and B A=14i and B= -4i+8j

DaniilM [7]

Assuming $\mathbf a,\mathbf b\in\mathbb R^3$ , you have

$\mathbf a\cdot\mathbf b=(14)(-4)+(0)(8)=-56$

so

$((\mathbf a\cdot\mathbf b)\,\mathbf i)\cdot\mathbf a=(-56\,\mathbf i)\cdot(14\,\mathbf i)=(-56)(14)=-784$

Next,

$\mathbf a+\mathbf b=(14\,\mathbf i)+(-4\,\mathbf i+8\,\mathbf j)=10\,\mathbf i+8\,\mathbf j$

Then

$(\mathbf a+\mathbf b)\times\mathbf b=\begin{vmatrix}\mathbf i&\mathbf j&\mathbf k\\10&8&0\\-4&8&0\end{vmatrix}=112\,\mathbf k$

$((\mathbf a+\mathbf b)\times\mathbf b)\times\mathbf k=\begin{vmatrix}\mathbf i&\mathbf j&\mathbf k\\0&0&112\\0&0&1\end{vmatrix}=\mathbf 0$

4 0

3 years ago

The cheerleading team lines up down the football field to rally the spectators. If there are 12 cheerleaders, which

Elan Coil [88]

Answer:

So they can line up every single 10 yards because there are 120 yards on a football field

Step-by-step explanation:

12 cheerleaders gives you 1 every 10 yards

hope i helped

8 0

3 years ago

A tiger weighs 617 pounds.<br> Another tiger weighs 326 pounds.<br> How much do they weigh total?

irina [24]

943 pounds when you add them together

5 0

3 years ago

What is 14145 divided by 23?

Kobotan [32]

Answer:

615

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

if you were to solve the following system by substitution, what would be the best variable to solve for and from what equation?

Romashka-Z-Leto [24]

Answer:

see below

Step-by-step explanation:

2x+8y=12 3x-8y=11

If we have to solve by substitution, Take the first equation and divide by 2

2x/2 + 8y/2 =12/2

x+4y = 6

Then subtract 4y from each side

x = 6 -4y

Then substitute this into the second equation

This is best solved by elimination

2x+8y=12

3x-8y=11

----------------

5x = 36

x = 36/5

6 0

3 years ago