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son4ous [18]
3 years ago
12

College Precalc. I desperately need help. Will award brainliest.

Mathematics
1 answer:
oee [108]3 years ago
3 0

Answer:

DK dk

Step-by-step explanation:

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Anon25 [30]
I dont know that but i need points so thanks
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3 years ago
Given that r = ( 7, 3, 9) and v = ( 3, 7, -9), evaluate r + v
uysha [10]

Answer:

b. (10,10,0)

Step-by-step explanation:

r+v can be evaluated if the vectors/matrices have the same dimensions.

These do. They are both 1 by 3 vectors.

Just add first to first in each.

Just add second to second in each.

Just add third to third in each.

Example:

(5,-5,6)+(1,2,3)

=(5+1,-5+2,6+3)

=(6,-3,9)

Done!

In general, (a,b,c)+(r,s,t)=(a+r,b+s,c+t).

r+v

=(7,3,9)+(3,7,-9)

=(7+3,3+7,9+-9)

=(10,10,0)

Done!

5 0
3 years ago
30/root 3-3 root 5<br> Ple answer this question
adoni [48]

\frac{30}{ \sqrt{3} - 3 \sqrt{5} } \\ \\ =\frac{30}{ \sqrt{3} - 3 \sqrt{5} } \times \frac{\sqrt{3} + 3 \sqrt{5}}{\sqrt{3} + 3 \sqrt{5}} \: \\ \\ that \: simply \: means \: multiplying \: by \: 1 \\ \\ \frac{30(\sqrt{3} + 3 \sqrt{5})}{ (\sqrt{3} + 3 \sqrt{5}) (\sqrt{3} - 3 \sqrt{5}) } \: \: \\ \\ by \: using \: formula \: {a}^{2} - {b}^{2} \\ \\ we \: get \\ \\ = \frac{30 \sqrt{3} + 90 \sqrt{5} }{ 3 - 45} \\ \\ = -  \frac{30( \sqrt{3} + 3 \sqrt{5}) }{42} \\ \\ =  - \frac{10( \sqrt{3} + 3 \sqrt{5}) }{14} \:  \:

4 0
3 years ago
Which equation can be used to solve for b?
jenyasd209 [6]
It is the last answer choice
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3 years ago
An 8-ounce bottle of glue costs $1.92. What is the unit price
lukranit [14]

Answer:

$0.27 for 1 ounce

Step-by-step explanation:

Hope this helps!!!

8 0
4 years ago
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