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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Simplify. Assume that no denominator is zero.(2x)9 (2x)0
A. 2x9 B. (2x)0 C. 2x0 D. (2x)9
Mathematics
Add or subtract.|11| - |-20|
A. 31 B. -9 C. 9 D. -31
Mathematics
Simplify the following by combining like terms.-8m9 + 3m9
A. -5m9 B. -45m C. -5m18 D. cannot be simplified
Mathematics
Make the indicated conversion.31,680 ft = 
mi
A. 7 B. 6 C. 6.5 D. 158.4
Mathematics