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Eduardwww [97]
3 years ago
6

If An atom has 10 protons, 11 neutrons, and 9 electrons. What is the atomic number of this atom?

Mathematics
1 answer:
lisov135 [29]3 years ago
3 0

Answer:

B

Step-by-step explanation:

Atomic number is equal to the number of protons in an atom.

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Select the assumption necessary to start an indirect proof of the statement. If 3a+7 < 28, then a<7.
pashok25 [27]
When applying indirect proofs, we assume the negation of the conclusion is true, and show that this assumption would lead to nonsense, or contradiction.

In our case we assume a is not smaller than 7, that is we assume a≥7.

a≥7 then, multiplying both sides by 3:
3a≥21, then, adding both sides 7:

3a+7≥28,

which is a contradiction because 3a+7 is smaller than 28.

So our assumption is wrong, which means the opposite of it is correct.


Answer: assume a≥7
7 0
3 years ago
Find the volume of a cone with a radius of 12 units and a height of 6<br> units.
svlad2 [7]
The volume is 905.32 i believe

12(12)=144, 144(3.14)=452.16, 452.16(6)=2712.96, 2712.96/3=904.32
7 0
3 years ago
The next four digits in the number 0.3435363738394041 are
Vera_Pavlovna [14]
<h3>The pattern is 0.01+</h3>

<u>So the next 4 digits are:</u>

<h3>0.4243</h3><h3></h3>

0.34353637383940414243

3 0
3 years ago
I need help !!! I don’t understand the problem
Pepsi [2]

Answer:

It would be -81²x+81x-18= -9x+6

Step-by-step explanation:

When you work equation one you get 18. Then when you work equation two, you get -2/3=-0.666666667

7 0
3 years ago
1. y =<br>(x - 1)(x + 3)<br>​
Nataliya [291]

Step-by-step explanation:

y=x(x+3)-1(x+3)

y= x^2+3x-x-3

y=x^2+2x-3

that is the answer

5 0
3 years ago
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