Radium - 221 has a half-life of 30 s. Suppose we have a 300 g sample. (a) Find a formula for the mass remaining after t seconds. (b) How much of the sample remains after 200 seconds? (c) After how long will only 20 g remain?
What will be an ideal response?
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Mathematics
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Find the unknown length in the right triangle. If necessary, approximate the length to the nearest thousandth.
A. 12 cm B. 8.602 cm C. 4.899 cm D. 7.348 cm
Mathematics
Perform the operations indicated. Simplify the answer whenever possible.13
- 
A. 12
B. 11
C. 12
D. 13
Mathematics
Simplify the expression. Assume that all variables represent positive real numbers.
? 
A. x22/3 B. x66 C. x9/3 D. x13/3
Mathematics
Provide an appropriate response.The polynomial 11z7 + 18z3 is called a ? .
Fill in the blank(s) with the appropriate word(s).
Mathematics