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VMariaS [17]
3 years ago
9

Given a = 2i+j – 2k b= -1 – 7j+k Find a x b

Mathematics
1 answer:
castortr0y [4]3 years ago
7 0

Step-by-step explanation:

a = 2i + j - k

b = -1 -7j + k

a × b = (2i + j - k) (-1 + 7j + k)

-2i + 14ij + 2ik - j + 7j^2 + jk + k -7jk - k^2

-2i + 14ij + 2ik -j +7j^2 +jk - 7jk + k - k^2

-2i + 14ij + 2ik - j +7j^2 - 6jk + k - k^2

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Find the surface area and volume of the prism at the right.
Lelechka [254]

Answer:

Surface Area: 34

Volume: 10u^{2}

Step-by-step explanation:

Volume = l*w*h

We need to divide the shapes up.

First Shape: 3 length * 1 width * 2 height

Second Shape: 2 length * 1 width * 2 height

6+4=10

Surface Area: 2(lw+wh+hl)

Lets divide the shape into two parts again and plug in the number into the formula.

2(3+2+6) = 2(11) = 22

However, for this, two units are inside to shape because we split it up. We can remove these 2 units.

22-2=20

Now we move to the next shape.

(Keep in mind, you can always just count surface area.)

2(2+2+4) = 2(8) = 16

However, again, two units are inside the shape because this is not just a simple figure.

16-2=14

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5 0
2 years ago
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It takes you 3 hours to drive to a concert 135 miles away how many miles
icang [17]
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4 0
3 years ago
Determine the solution to the system of equations given below y=x^2-5x+15
Maslowich

Answer:

x=(5+i*sqrt(35))/2, (5-i*sqrt(35))/2

Step-by-step explanation:

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a = 1

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Substitute and simplify.

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When you get a negative number inside the square root, remember that you can pull out i to make the number inside positive.

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lutik1710 [3]

Answer:

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Step-by-step explanation:

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This last fact gives the box plot for School B a symmetric appearance that is not shared by the plot for School A.

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When Jose installs a new app on his phone, it creates a square icon on his home screen. The square starts with
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O 20.8 centimeters

Step-by-step explanation:

Guessed on Edge and got it right.

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