3 years ago

In a neutral atom that has 18 protons, how many electrons does it have?

Mathematics

1 answer:

Llana [10]3 years ago

6 0

Neutral atoms must have equal numbers of protons and electrons

Solution: 18 electrons

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the attendance of your club increased by 30% from last year. there are 195 people in the club now. a. write a proportion to find

astra-53 [7]

Answer:

$\dfrac{x}{195}=\dfrac{100}{130}$

B. 150

Step-by-step explanation:

Let x be the number of people at the club last year.

The attendance of your club increased by 30% from last year. This means that if the last year attendance was 100%, this year attandance is 100% + 30% = 130%

Thus,

x people - 100%

195 people - 130%

A. Write a proportion:

$\dfrac{x}{195}=\dfrac{100}{130}$

B. Cross multiply:

$130\cdot x=100\cdot 195\\ \\130x=19,500\\ \\13x=1,950\\ \\x=\dfrac{1,950}{13}=150$

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Answer:

Step-by-step explanation:

Rate of change= slope/gradient (Constant of proportionality, slope, unit rate)

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3 years ago

you invest $1000 dollars in an account at 2.5% per year simple interest. How much will you have in the account at the beginning

Lina20 [59]

I = PRT

P = 1000
R = 2.5% -- change to a decimal = .025
T = 3

 now we sub I = PRT
I = (1000)(.025)(3)
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Hope this helps!!
~Lena~

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ANSWER IS 2 ND OPINION

Step-by-step explanation:

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