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Lemur [1.5K]
4 years ago
12

This is how zirconium appears in the periodic table. Rounded to the nearest whole number, how many electrons are in an atom of z

irconium? 40 51 91 131
Mathematics
2 answers:
Ber [7]4 years ago
4 0

Answer:

40

Step-by-step explanation:

Zirconium is the 40th element in the periodic table. It means its atomic number (the number of protons inside the nucleus) is 40. But atoms are electrically neutral: this means that their number of electrons matches the number of protons. Therefore, since the atom of zirconium has 40 protons, it also has 40 electrons.

Marina86 [1]4 years ago
3 0
The answer is:

Rounded to the nearest whole number, there are 40 electrons in an atom of Zirconium.

I hope this helps :D 

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The company sells the toys for $12 each. Write an expression for the amount of
Nady [450]

Answer: I(x)=12x

Step-by-step explanation:

Let I represent the total money earned

Let x represent the number of toys sold

Since each toy is 12 dollars, then the company will earn 12 dollars for each toy that is sold.

Therefore,  the equation is,

I(x)=12x  

5 0
3 years ago
Someone plz help me i will give brainliest just
andreev551 [17]

Answer:

5) y = 3x + 1

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8 0
3 years ago
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5. If on a scale drawing 60 miles
HACTEHA [7]

Answer:

6 miles

Step-by-step explanation:

60 miles : 5 inches

12 miles  : 1 inch

6 miles   : 1/2 inch

whatever you do to one side of the ratio you have to do to the other.

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6 0
3 years ago
A research team at Cornell University conducted a study showing that approximately 10% of all businessmen who wear ties wear the
LenKa [72]

Answer:

a) The probability that at least 5 ties are too tight is P=0.0432.

b) The probability that at most 12 ties are too tight is P=1.

Step-by-step explanation:

In this problem, we could represent the proabilities of this events with the Binomial distirbution, with parameter p=0.1 and sample size n=20.

a) We can express the probability that at least 5 ties are too tight as:

P(x\geq5)=1-\sum\limits^4_{k=0} {\frac{n!}{k!(n-k)!} p^k(1-p)^{n-k}}\\\\P(x\geq5)=1-(0.1216+0.2702+0.2852+0.1901+0.0898)\\\\P(x\geq5)=1-0.9568=0.0432

The probability that at least 5 ties are too tight is P=0.0432.

a) We can express the probability that at most 12 ties are too tight as:

P(x\leq 12)=\sum\limits^{12}_{k=0} {\frac{n!}{k!(n-k)!} p^k(1-p)^{n-k}}\\\\P(x\leq 12)=0.1216+0.2702+0.2852+0.1901+0.0898+0.0319+0.0089+0.0020+0.0004+0.0001+0.0000+0.0000+0.0000\\\\P(x\leq 12)=1

The probability that at most 12 ties are too tight is P=1.

5 0
3 years ago
The area of a trapezoid is 36.36 square centimeters. One base of the trapezoid is 14.8 centimeters. Its height is 3.6 centimeter
zmey [24]
The third answer (Dividing the area by the height, multiplying the quotient, etc) is correct.

If we multiply by the height, we receive an expression equal to the sum of the bases divided by two.  Multiplying by two, we now have the sum of the bases.  Subtracting one base gives the length of the other base.
3 0
3 years ago
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