Eva invested a certain amount of money at 15% interest and $2,000 more than that amount at 16%. Her total yearly interest was $1,715. How much did she invest at each rate?
A. $2,000 at 15%, $4,500 at 16%
B. $4,500 at 15%, $6,500 at 16%
C. $4,700 at 15%, $6,300 at 16%
D. $4,700 at 15%, $6,700 at 16%
E. $6,500 at 15%, $4,500 at 16%
Answer: B
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, 
, 
, 
, 
, . . .
A. 
B. 
C. 
D. 
Solve using addition/subtraction
Solve using the multiplication principle.-4.4m = -39.6
A. 35.2
B. 
C. 30.6
D. 9
Solve the problem.In the formula A(t) = A0ekt, A is the amount of radioactive material remaining from an initial amount A0 at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.275% annually. Determine the half-life of this isotope, to the nearest year.
A. 109 yr B. 3 yr C. 252 yr D. 182 yr