Solve the problem.Find the half-life of the radioactive element radium, assuming that its decay constant is 
with time measured in years.
A. 2308 years
B. 1400 years
C. 800 years
D. 1600 years
Answer: D
You might also like to view...
Solve the inequality. Write the solution set in interval notation and graph it.
(x + 5) > 
(x + 5)
A. (-?, 5)
B. (-?, -5)
C. (5, ?)
D. (-5, ?)
Add or subtract. Simplify by collecting like radical terms, if possible.-2
- 4
+ 3
A. 138
B. -2
C. -138
D. -22
Use the formula for the general term (the nth term) of a geometric sequence to find the indicated term of the sequence with the given first term, a1, and common ratio, r.Find a10 when a1 = 4, r = -3.
A. -78,732 B. -23 C. 236,196 D. -78,728
A residential building contractor borrowed $29,000 to complete a new home. Some of the money was borrowed at 4%, some at 6%, and some at 7%. How much was borrowed at each rate if the annual interest owed was $1,580 and the amount borrowed at 6% is two times more than the amount borrowed at 7%?
A. $11,000 at 4%; $12,000 at 6%; $6,000 at 7% B. $9,000 at 4%; $14,000 at 6%; $6,000 at 7% C. $9,000 at 4%; $13,000 at 6%; $7,000 at 7% D. $10,000 at 4%; $10,000 at 6%; $8,000 at 7% E. $10,000 at 4%; $14,000 at 6%; $7,000 at 7%