Solve the problem.The half-life of radium is 1690 years. If 150 grams is present now, how long (to the nearest year) till only 100 grams are present?
Fill in the blank(s) with the appropriate word(s).
989 years
Mathematics
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Evaluate the expression.71
A. 7
B. 1
C. -7
D. 
Mathematics
Rationalize the denominator.
A. 
- 
B. 
C. 
D. 
Mathematics
Find the indicated roots. Write the answer in a + bi form.Cube roots of 8
A. 2, 1 + 
i, 1 - 
i
B. 2, -1 - 
i, 1 - 
i
C. 2, -1 + 
i, -1 - 
i
D. 2, 1 + 
i, -1 - 
i
Mathematics
Give the exact value.tan 
A. 
B. 
C. 
D. - 
Mathematics