Solve the problem.The decay of 978 mg of an isotope is given by 
where t is time in years. Find the amount left after 
A. 144
B. 946
C. 140
D. 72
Answer: A
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Solve the nonlinear system of inequalities.x2 + y2 ? 9
+ 
? 1
A. 
B. 
C. No real solutions
D. 
Simplify the expression.
?
?
A. 
B. 
C. 
D. 
E. 
Solve the problem.An earthquake was recorded with an intensity which was 
times more powerful than a reference level earthquake, or 
What is the magnitude of this earthquake on the Richter scale (rounded to the nearest tenth)? Intensity on the Richter scale is 
A. 5.1 B. 11.7 C. 0.5 D. 4.1
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where H+ represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 
A. 2.8 B. 3.8 C. 2.2 D. 3.2