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4vir4ik [10]
3 years ago
6

20×10 cubed=2,000 true or false

Mathematics
1 answer:
Nataliya [291]3 years ago
6 0

Well, your question can be read and understood in two different ways,
depending where the parentheses are supposed to be.

Here are the questions and answers for both ways:


Way #1:    (20) x (10)³

(10)³ = 1,000

20 x 1,000 = 20,000

That's not 2,000 so the equation is false.

======================================

Way #2:    (20 x 10)³

20 x 10 = 200

(200)³ = 8,000,000

That's not 2,000 either so the equation is false again.

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21. (4x-9y) + (6x+10) + (8y-4)
= 4x + 6x - 9y + 8y + 10 - 4
= 10x - y + 6
—> D

22. (6x+9y-15) + (2x-9y+8)
= 6x + 2x + 9y - 9y - 15 + 8 (the 9y - 9y = 0, so you can leave it out of the final equation)
= 8x - 7
—> D

23. (9x^2-8x+3) - (5x^2-6x+4)
= 9x^2 - 8x + 3 - 5x^2 -(-6x) - 4
= 9x^2 - 5x^2 - 8x + 6x + 3 - 4 (remember that two - signs next to each other make a + sign)
= 4x^2 - 2x - 1
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24. (9x^3-7x+8) - (5x^2+7x-10)
= 9x^3 - 7x + 8 - 5x^2 - 7x -(-10)
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25. (6x+14y) - ((7x+5y) + (x-8y))
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= 6x + 14y - 8x -(-3y)
= 6x - 8x + 14y + 3y
= -2x + 17y
—> B
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2 years ago
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