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koban [17]
3 years ago
9

What is the value of the expression below when x = 4 and y = 4? 3x + 7y

Mathematics
2 answers:
Diano4ka-milaya [45]3 years ago
7 0

Answer:

40

Step-by-step explanation:

3x + 7y

Replace the letters with said numbers,

3(4) + 7(4)

Multiply,

12 + 28

And add!

40

Delvig [45]3 years ago
7 0

Answer:

40

3(4)+7(4)=40

Step-by-step explanation:

x=4

y=4

3x + 7y

3(4)+7(4)

3x4=12

7x4=28

12+28=40

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A) 4a - 3b + 2c

4(2, -1, 5) - 3(4, 3 , -2) + 2(5, 4, 0) = (8, -4, 20) - (12, 9, - 6) + (10, 8, 0) =

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Answer: (6, - 5, 26)

b) magnitude of vector b

\sqrt{4^2+3^2+(-2)^2} = \sqrt{16+9+4} = \sqrt{29} ~ 5.4

c) vector of length 7 parallel to vector c

=> m(5,4,0) = (5m,4m,0)

=>    \sqrt{(5m)^2+(4m)^2+0}= \sqrt{25m^2+16m^2}= \sqrt{41m^2}=m \sqrt{41}=7

=> m = 7 / √41 ≈ 1.093

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Answer: (5.465 , 4.372 , 0)
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