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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Solve the problem.A size 8 dress in Country C is size 56 in Country D. A function that converts dress sizes in Country C to those in Country D is 
Find the inverse function.
A. f-1(x) = 
B. f-1(x) = x - 20
C. f-1(x) = 
- 20
D. f-1(x) = 
+ 20
Mathematics
The graph of an ellipse is given. Find the standard form of the equation of the ellipse. 
A. 
- y2 = 1
B. x2 + 
= 1
C. 
+ y2 = 1
D. 
+ y2 = 1
Mathematics
Multiply.(r - w)2
A. r2 - 2rw - w2 B. r2 - 2rw + w2 C. r2 - rw + w2 D. r2 + 2rw + w2
Mathematics
Divide.(-40) ÷ (-5)
A. -9 B. 8 C. -8 D. 9
Mathematics