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zloy xaker [14]
2 years ago
12

Does subtraction exhibit a property of closure over the set of real numbers? Is subtraction commutative? If not, give an example

to demonstrate.
Mathematics
1 answer:
pickupchik [31]2 years ago
7 0
<span>Subtraction exhibit a property of closure over the set of real numbers because if you subtract two numbers from the real numbers set, the result will still be  a real number.

Example:
Let RS be a set of real numbers.
RS = {1, 2, 3}
Suppose I get 3 and subtract 1, 3 - 1, the result is 2 which is a real number. We can try a non-commutative 1 - 3 and yet it will still give us a real number which is -2.

</span><span>Subtraction is non-commutative because if we interchange numbers in subtraction, the result will either be positive or negative.

Example:
3 - 1 = 2. The answer is 2; but we can not say this is true for 1 - 3 because it will yield -2.
</span>

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The sum of three numbers is 24. Twice the middle number is 2 more than the largest number, and the largest number is equal to th
harina [27]

Answer:

  • x = 5, y = 7, z = 12

Step-by-step explanation:

<u>Let the numbers be x, y and z</u>

  • x + y + z = 24
  • 2y = z + 2
  • z = x + y

<u>Solving by substitution:</u>

  • x + y + z = z + z = 24
  • 2z = 24
  • z = 12

  • 2y = z + 2
  • 2y = 12 + 2
  • 2y = 14
  • y = 7

  • z = x + y
  • x = z - y
  • x = 12 - 7 = 5

<u>The answer:</u>

  • x = 5, y = 7, z = 12
8 0
3 years ago
Hey guys help my please !!Q 4,6,7
padilas [110]
Q4, 4y²=60
y=√15 ( i am not sure)
q6, (5+y) ²=81
5+y=9
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(x+11) (x-7) =0
x=-11(rej) or x=7
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6 0
3 years ago
Solve and graph: 7x-6&gt;22<br>(pls explain your answer, im confused on this)​
grandymaker [24]

Answer:

x>4

Step-by-step explanation:

Solving an inequality is very similar to solving an equation:

Given: 7x-6>22

Add 6 to both sides: 7x>28

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x>4 means that all x-values that are greater than 4 will work. Therefore you would write an open dot at x=4 on the number line to show that 4 isn't included, and draw an arrow going right to show all possible solutions greater than 4.

6 0
2 years ago
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Nitella [24]

Answer:

z would be 0.4 !

Step-by-step explanation:

Hope this helps :)))

6 0
3 years ago
Read 2 more answers
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I am Lyosha [343]
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The size of that spot varies.  It depends on exactly how far the Moon
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The longest possible totality viewed from a single location is about
7-1/2 minutes, when all the geometry is just right.  Then, I believe,
the black spot on the Earth's surface is something like 170 miles
across, moving at around 24 miles a minute, or  1,460 miles per hour.
8 0
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