The following function represents the amount of the radioactive material present at time t (in years): -.0035t Alel=2e Find the half-life of this material. In other words, find the time necessary for 50% of the original mass to decay. O 137 years O 70 years O 198 years O 99 years

Determine the principal P that must be invested at interest rate r, compounded continuously, so that $1,000,000 will be available for retirement in t years. r = 10%,    t = 25   A= r= t=   Substitute the values of A, r, and t into the compound interest formula  A = Pert         Divide to isolate P.     Simplify to find P.

Which of the following exponential functions grows at the slowest rate ? Select one: O a. y = 4x² O b. y = .5-* O c. y = ex O d. y = -0.5*