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Art [367]
2 years ago
15

Given that v = (5,-4, 4) and w = (9-2,7) , evaluate v • w.

Mathematics
1 answer:
yuradex [85]2 years ago
4 0

Answer:

a

Step-by-step explanation:

Given

u = (x₁, y₁, z₁ ) and v = (x₂, y₂, z₂ ) then the dot product is

u • v = (x₁ x₂ ) + (y₁ y₂ ) + (z₁ z₂ )

Then

v • w

= (5 × 9) + (- 4 × - 2) + (4 × 7)

= 45 + 8 + 28

= 81 → a

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X +9 &lt; 9 and x +7 &gt; 5<br> But the less than signs are less than or equal to.
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Step-by-step explanation:

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3 years ago
Is x=4 a solution to the equation 6=x+2? Is it a solution to the inequality 2x≥9?
jek_recluse [69]

Answer:

Is x = 4 a solution to the equation 6 = x + 2? YES

Is x = 4 a solution to the inequality 2x ≥ 9? NO

Step-by-step explanation:

Is x = 4 a solution to the equation 6 = x + 2? YES

we cans solve the equation 6=x+2 by clearing for x:

6 = x + 2

we move the +2 on the right as a -2 to the left:

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this way we find that indeed x = 4 is a solution to 6 = x + 2.

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2x ≥ 9

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thus, <u>4 is not a solution to the inequality</u> because 4 is less than 4.5

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