The number of kilograms, y, of a radioactive element that remains after t hours can be modeled by the equation y = 0.23 ( 0.91 ) t . What is the rate of decrease of this radioactive element? A. 9% per hour B. 23% per hour C. 77% per hour D. 91% per hour

A. 9% per hour

Step-by-step explanation:

we know that

The equation of a exponential decay function is given by

where

a is the initial value

r is the rate of decrease

we have

Convert to percentage

Multiply by 100

answer: f = 32.2m

step-by-step explanation: that is the answer

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )