2 years ago

Can i have help with these two problems.

Mathematics

1 answer:

Gelneren [198K]2 years ago

4 0

Answer:

(11/7)x + (3/7)y

Step-by-step explanation:

Perform the indicated multiiplication. We get:

(6/7)x - (2/5)y + (5/7)y + (5/7)x

Now combine like terms, obtaining: (11/7)x + (3/7)y

An alternative expression would be (1/7)(11x + 3y)

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5(n+1) = 2n + 20 can someone tell me the answer and explain

finlep [7]

Answer:

n=15

Step-by-step explanation:

5(n+1)=2n+20

U start by expanding the first term which will give you 5n+5

Then after that u collect like terms giving u

5n-2n=20-5

Finally u evaluate it giving u

n=15

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2 years ago

A car travels at an average speed of 56 miles per hour. How long does it take to travel 322 miles?

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Answer:

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PLEASE HELP ME!!!!!!!!

Delicious77 [7]

Angle θ between two vectors is given by, $\theta =cos^{-1}( \frac{u
 \cdot v}{|u||v|} )$ ; where $u \cdot 
v=-5(-4)+(-4)(-3)=20+12=32$ ; $|u|= \sqrt{ (-5)^{2} + (-4)^{2} } = 
\sqrt{25+16} = \sqrt{41}$ and $|v|=\sqrt{ (-4)^{2} + (-3)^{2} } = 
\sqrt{16+9} = \sqrt{25}=5$ .
Therefore, $\theta =cos^{-1}( \frac{32}{ 5\sqrt{41}} )=cos^{-1}0.9995=1.8^o$

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3 years ago