Answer:
1) 80%
2) 95%
3) 33 %
4) 15%
Step-by-step explanation:
1) 4 of 5 must be written as a percent over 100 so you divide,
5 ÷ 100 = 20 so 20 * 4 = 80% so the answer is 80%
2) 19 of 20 must be written as a percent over 100 so you divide,
19 ÷ 20 = 0.95 so the answer is 95%
3) 50 of 150 must be written as a percent over 100 so you divide,
50 ÷ 150 = 0.33 so the answer is 33 %
4) 6 of 40 must be written as a percent over 100 so you divide,
6 ÷ 40 = 0.15 so the answer is 15%
Answer:
1/16
Step-by-step explanation:
Demont made one fourth () pound of rock candy
He separates the candy into four sacks equally.
This is done by dividing the total fraction of candy of a pound of candy made by the number of sacks
The fraction of a pound of candy that will be in each sack therefore is:
Therefore, One-Sixteenth of a pound of candy will be in each of the sack.
The mass of cesium left afer 120 years if the original mass of cesium is 8640 with an half-life of 30 years, is 540 grams.
<h3>What is half-life?</h3>
This can be defined as the time taken for half the amount of a radioactive substance to decay.
To calculate the amount of cesium left after 120 years, we use the formua below.
Formula:
- R' = R/()............. Equation 1
Where:
- R = Original amount of Cesium
- R' = New amount of cesium
- T = Total time
- t = Half-life
From the question,
Given:
- R = 8640
- T = 120 years
- t = 30 years
Substitute these values into equation 1
- R' = 8640/()
- R' = 8640/
- R' = 8640/16
- R' = 540 grams.
Hence, The mass of cesium left afer 120 years is 540 grams.
Learn more about half-life here: brainly.com/question/25750315