Question 5 The half-life of iodine-131 is 8 days. The amount of a 100 gram
sample of the isotope left d days after being introduced is
I = 100 (½)^d/8
What is the percent change per day?

A. 8.3% decrease per day
B. 91.7% decrease per day
C. 50% decrease per day
D. 99.6% decrease per day

In which of the situations can information about tyler be represented by the expression r+3 when r represents information about ray? check all that apply.

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis. y = 7ex, y = 7e^-x, x = 1; about the y-axis

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).