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sdas [7]
3 years ago
5

Given vectors u=7i + 3j and v=-4i + 3j, find 5u-4v in terms of unit vectors i and j

Mathematics
2 answers:
Nastasia [14]3 years ago
7 0

Answer:

THE ANSWER IS A

Step-by-step explanation:

il63 [147K]3 years ago
5 0

Answer:

5u - 4v = 51i + 3j

Step-by-step explanation:

The given vectors are u=7i + 3j and v=-4i + 3j, find 5u-4v in terms of unit vectors i and j.

We substitute the vectors to get:

5u - 4v = 5(7i + 3j) - 4( - 4i + 3j)

We perform the scalar multiplication to get:

5u - 4v = 35i + 15j  + 16i  - 12j

Group the components;

5u - 4v = 35i  + 16i   + 15j- 12j

We simplify to get:

5u - 4v = 51i   + 3j

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Please explain the how you got the answers thanks asap
stich3 [128]

Answer:

a) 90 stamps

b) 108 stamps

c) 333 stamps

Step-by-step explanation:

Whenever you have ratios, just treat them like you would a fraction! For example, a ratio of 1:2 can also look like 1/2!

In this context, you have a ratio of 1:1.5 that represents the ratio of Canadian stamps to stamps from the rest of the world. You can set up two fractions and set them equal to each other in order to solve for the unknown number of Canadian stamps. 1/1.5 is representative of Canada/rest of world. So is x/135, because you are solving for the actual number of Canadian stamps and you already know how many stamps you have from the rest of the world. Set 1/1.5 equal to x/135, and solve for x by cross multiplying. You'll end up with 90.

Solve using the same method for the US! This will look like 1.2/1.5 = x/135. Solve for x, and get 108!

Now, simply add all your stamps together: 90 + 108 + 135. This gets you a total of 333 stamps!

5 0
3 years ago
PLEASE HELP ME! :(
snow_lady [41]
Here, I'll do the first one for you.
When they are talking about a number, use "x".
Since it says twice a number, you say 2x. Or 3x for three times the number
2x+12=3x-31
Then use algebra to find x. Get the numbers on one side and all the x's on the other.
2x+12+31=3x-31+31
2x+43-2x=3x-2x
x=43

Now do the rest on your own!

5 0
3 years ago
At a game booth, a student gets a box of candy as the prize for winning a game. The boxes come in four colors: white, red, green
Rainbow [258]
I think the answer is D) 8 over 32 multiplied by 7 over 31
Hopefully that helped! :) 
4 0
3 years ago
Plssssssssssss Solve for x: <br><br> -(2/5)x + 4 20<br> c. x -20
Mice21 [21]

Answer:

Step-by-step explanation:

412

5 0
3 years ago
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nika2105 [10]

Answer:

To multiply these two terms you multiply each individual term in the left parenthesis by each individual term in the right parenthesis.

(

x

+

5

)

(

x

+

2

)

becomes:

(

x

×

x

)

+

(

x

×

2

)

+

(

5

×

x

)

+

(

5

×

2

)

x

2

+

2

x

+

5

x

+

10

We can now combine like terms:

x

2

+

(

2

+

5

)

x

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10

x

2

+

7

x

+

10

Step-by-step explanation:

7 0
3 years ago
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