The amount of radioactive element remaining, r, in a 100-mg sample after d days is represented using the equation r=100 (1/2) ^d/5. What is the daily percent of decrease?

A. 87.06%

B. 12.94%

C. 3.13%

D. 10%

Question

Mathematics

Marc Boyle

9 September, 18:00

The amount of radioactive element remaining, r, in a 100-mg sample after d days is represented using the equation r=100 (1/2) ^d/5. What is the daily percent of decrease?

A. 87.06%

B. 12.94%

C. 3.13%

D. 10%

+4

Answers (1)

Know the Answer?

Natalya Coleman · Answer 1

The equation is

R=100 (1/2) ^ (d/5)

After one day the remaining is

R=100 * (1:2) ^ (1:5)

R=87.06 remaining

It decreased by 12.94 (100-87.06)

So the daily percent of decreases is 12.94%

The amount of radioactive element remaining, r, in a 100-mg sample after d days is represented using the equation r=100 (1/2) ^d/5. What is the daily percent of decrease?A. 87.06%B. 12.94%C. 3.13%D. 10%

The amount of radioactive element remaining, r, in a 100-mg sample after d days is represented using the equation r=100 (1/2) ^d/5. What is the daily percent of decrease?

A. 87.06%

B. 12.94%

C. 3.13%

D. 10%