Solve the problem.Use the formula N = Iekt, where N is the number of items in terms of the initial population I, at time t, and k is the growth constant equal to the percent of growth per unit of time. A certain radioactive isotope decays at a rate of 0.2% annually. Determine the half-life of this isotope, to the nearest year.
A. 3 years
B. 347 years
C. 250 years
D. 151 years
Answer: B
Mathematics
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Rewrite the expression with a positive rational exponent. Simplify, if possible.
A. y1/2
B. y
C. y3/4
D. 
Mathematics
Solve the equation.2x1/2 - 9x1/4 - 18 = 0
A. {-6, -3}
B. 
C. {1296}
D. 
Mathematics
Solve the system of equations using matrices (row operations). If the system has no solution, say that it is inconsistent.
A. x = -3, y = -5; (-3, -5) B. inconsistent C. x = 5, y = -3; (5, -3) D. x = -3, y = 5; (-3, 5)
Mathematics
Use a graphing utility to graph the polar equation.r = 2 + 4 sin ?8
-8
A.
| 8 |
| -8 |
B.
| 8 |
| -8 |
C.
| 8 |
| -8 |
D.
| 8 |
| -8 |
Mathematics