Solve the problem.Find the half-life of the radioactive element radium, assuming that its decay constant is 
with time measured in years.
A. 2308 years
B. 1600 years
C. 800 years
D. 1400 years
Answer: B
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Graph the function in the ts-plane (t-axis horizontal, s-axis vertical). State the period and symmetry of the function.s = sec 
A. Period 6?, symmetric about the t-axis
B. Period 6?, symmetric about the s-axis
C. Period 6?, symmetric about the t-axis
D. Period 6?, symmetric about the s-axis
Find the center of mass of a thin plate of constant density covering the given region.The region in the first and fourth quadrants enclosed by the curves 
and 
and by the lines 
and 
A. 
= 
, 
= 0
B. 
= 
, 
= 0
C. 
= 
, 
= 0
D. 
= 0, 
= 
Find the distance on the number line between the pair of numbers.11.0, -19.2
A. 15.1 B. 4.1 C. 30.2 D. 8.2
List the critical values of the related function. Then solve the inequality.
> 0
A. 
; 
B. - 
; 
C. - 
; 
D. 0; (0, ?)