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Vedmedyk [2.9K]
3 years ago
12

Which sets are not closed under subtraction

Mathematics
1 answer:
anastassius [24]3 years ago
6 0

If you're referring to the different sets of real numbers, it's the ones that you could try to do subtraction and not get an answer that still in that set.

For example, natural numbers (aka 1, 2, 3, 4, ...) are not, because 7 - 11 = -4 and -4 is not a natural number.

Also, whole numbers (aka 0, 1, 2, 3, 4, ...) has the same issue.

Basically any set of real numbers that doesn't include negative numbers will have this issue.

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What is the value of z in the equation 2(4z − 3 − 1) = 166 − 46?
shepuryov [24]

Refine 2(4z-3-1)

= 2(4z-4)

Refine : 166 - 16 = 120

therefore:

2(z-4) = 120

Divide both sides by  2 :

\frac{2(z-4)}{2} =  \frac{120}{2}

4z-4 = 60

add 4  to both sides:

4z-4+4 = 60+4

4z = 64

Divide both sides by 4 :

\frac{4z}{4} =  \frac{64}{4}

z = 16

hope this helps!


8 0
3 years ago
Read 2 more answers
Subtract.
LekaFEV [45]

Answer:

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Step-by-step explanation:

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(5x^(2))- (-2x^(2))=7x^(2)

(- 2)-(+10)=+8

7x^(2)-3x+8

6 0
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Steven wants to buy a $565 bicycle. Steven has no money saved. But will be able to deposit $30 into a savings account when he re
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565+65=630 so he needs that much to get the bike AND pay his sister back. 630 divided by $30 is 21. So, in 21 weeks, Steven Can pay back his sister and get the bike
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Let f(x) = 3x + 2 and g(x) = x - 3. Find g(x) - f(x) and state its domain.
Bad White [126]
We have that

<span>f(x) = 3x + 2
</span><span>g(x) = x - 3

[</span>g(x) - f(x)]=(x-3)-(3x+2)--------> (x-3-3x-2)-----> -2x-5

the domain is all real numbers

the answer is
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Answer:

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Step-by-step explanation:

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3 years ago
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