If (x-1) / x =20 , then x=

Answers

Answer 1

Answer: $( x-1 )/(x) =20 \n \n x\neq 0\n \n20x=x-1\n \n20x - x = -1\n \n19x = -1 \ \ / :19 \n \nx= -(1)/(19)$

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A radioactive kind of nitrogen has a half-life of 10 minutes. If you start with 64 grams of the substance, how much will be left after 20 minutes

Answers

There would be 16 grams left after 20 minutes.
64/2 = after ten minutes
= 32
32/2 = after another ten minutes (20 full)
= 16

Answer:

Step-by-step explanation:

First, find out how many half-lives have passed. Divide the number of minutes by the length of a half-life.

20÷10=2

2 half-lives have passed.

Now figure out how much nitrogen will be left after 2 half-lives have passed. Multiply the starting amount of nitrogen by

1/2

a total of 2 times.

120x1/2 1/2=30

That calculation could also be written with exponents:

120x(1/2)2=30

After 2 half-lives, the amount of nitrogen left will be 30 grams.

If 45 cookies will serve 15 students, how many cookies are needed for 30 students?I think i have it but not sure

Answers

The above question has to do with proportionality, specifically direct proportionality.

Direct proportionality means when an item x is directly proportional to an item y. This is represented mathematically as:

x ∝ y

90 cookies will serve 45 students.

The number of cookies needed for 30 students is 90 cookies

From the above question,

45 cookies will serve 15 students

Hence,

15 students = 45 cookies

30 students = ?

Cross Multiply

30 students x 45 cookies / 15 students

= 90 cookies.

Therefore, 90 cookies will serve 45 students.

To learn more, visit the link below:

brainly.com/question/18536567

Because your numbers are simple in this question, you can look at it this way...

You know how many cookies are needed for 15 students but you need to fiqure out how many for 30 students. The ratio between 15 to 30 is a 1:2, AKA double. THis means that you can simply double the known number of cookies and it will give you the amount that you need for double the people.
Your answer is 90 cookies.

What is the precent of 10/12

Answers

Answer:

83.33%

Step-by-step explanation:

The 3 goes on and on

A box of 12 popsicles cost $4.44 what is the Popsicles unit rate

Answers

$4.44/12 Popsicles = $0.37/Popsicle.

The Popsicle unit rate it $0.37/Popsicle

I hope this helped :3

37 cents a popcicle you can find this by dividing the total cost 4.44 by 12 which equals 0.37

What is 30 divided by 8.5

Answers

$30 / 8.5 \n \n 3.5294 \n \n Answer: \fbox {3.5294}$

This problem can be solved by doing long division.

$(30)/(8.5) = \boxed{\bf{3.52941176471}}$

Nina had 9 apples to share with 5 of her friends. If all 6 people get an equal share, how many apples will each person get? How do you know?

Answers

Each person will get 1 apple and there will be 3 left. I know this because it is 6 people and if each person gets 1 apple there will only be 3 left. 9-6=3

Sorry but i can do 6/3equals 2 ,so each friend will get 2apples!!

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