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kodGreya [7K]
3 years ago
10

Only answer 28 ( I added this parentheses so that the thing would accept my question)

Mathematics
1 answer:
avanturin [10]3 years ago
3 0

Answer:

(a). Number of protons in a chlorine atom = 17

(b). Atomic number of sodium = 11

Step-by-step explanation:

Let the number of protons in a sodium atom = <em>x</em>

Then, the number of protons in a chlorine atom =<em> x</em> + 6

Now, it is given that the atomic number of an element is equal to the number of protons per atom.

So, atomic number of sodium (Na) = <em>x</em>

Atomic number of chlorine (Cl) = <em>x</em> + 6

It is given that the atomic number of chlorine is 5 less than twice the atomic number of sodium.

∴ atomic number of chlorine (Cl) = 2 × atomic number of sodium (Na) - 5

⇒ <em>x</em> + 6 = 2<em>x</em> - 5

⇒ <em>x </em>- 2<em>x</em> = -5 - 6

⇒ -<em>x</em> = -11

Cancelling the minus sign from both sides, we get

<em>x</em> = 11

(a). Number of protons in a chlorine atom = <em>x</em> + 6

                                                                     = 11 + 6      (∵ <em>x</em> = 11)

                                                                     = 17

(b). Atomic number of sodium = <em>x</em> = 11

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satela [25.4K]
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\boxed{d=v \times t}
d stands for distance, v stands for speed, t stands for time

The car
d = 48 × t
d = 48t

The motorcycle
d = 20 × t
d = 20t

At the end of t hours, the car is 48t miles (east) from the start point and the motorcycle is 20t miles (north) from the start point.

Second, determine the distance between 48t miles at east and 20t miles at north using pythagoras
distance = \sqrt{(48t)^{2}+(20t)^{2}}
distance = \sqrt{2304t^{2}+400t^{2}}
distance = \sqrt{2704t^{2}}
distance = 52t

The expression for their distance apart at the end of t hours is 52t
7 0
3 years ago
Can someone pls help mee plsss I tried and I still can't get it​
7nadin3 [17]

Answer:

All integers are whole numbers

Step-by-step explanation:

Integers include all whole numbers and their negative counterpart (basically numbers that are NOT fractions or decimals).

Whole numbers don't include negative numbers (as negative numbers are rational numbers).

4 0
3 years ago
Does somebody knows this one?
Katarina [22]

Answer:

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8 0
2 years ago
PLEASE HELP!
Kitty [74]
You can reword the two equations as:

-5x-y=15 (Divide original value by 3)
-2x+6y=6

Then use elimination to find x:

-30x-6y=90 (Multiply by 6 to get y values to be same to cancel out)
-2x+6y=6

You're left with:

-32x=96. Which can then be solved to find x which is -3.

Then plug back in 

-2x+6y=6

Now to: -2(-3)+6y=6.

Which reduces to 6+6y=6. So y=0.



To graph them, just reword the equations (yes once again) so that y is in front.

y=-5x-15 and y=(1/3)x+1






8 0
3 years ago
68. If Fran can only pay $250 per month, what is the most expensive boat she can buy without a down payment?
damaskus [11]

Answer:

If she buys a boat without a down payment, then the affordable price is 5,700.

Step-by-step explanation:

Her bank charges 5% interest per year.

Let, payment = p,

p = 250(\frac{1-(1+\frac{0.05}{12})^-24}{\frac{0.05}{12}})

p = 5698.47

After round off p = 5700

3 0
3 years ago
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