Write an exponential decay model for each situation. The value of x for each value of f(x) will lie between two consecutive whole numbers. List the whole
numbers.

4. initial value: 1,000
decay rate: 20%
f(x) = 500

5. initial value: 1,800
decay rate: 7%
f(x) = 400

6. initial value: 1,200
decay rate: 12.5%
f(x) = 450

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

1/4 and 8/3 because:

the reciprocal if 4 is 1/4 because 4 is used as 4/1 and the opposite of that is 1/4. the opposite of 3/8 is 8/3 so that is the answer.

the weight of the object inside the box!