Solve.If an earthquake measured 
on the Richter scale, what was the approximate intensity of the earthquake? The magnitude of an earthquake of intensity I is defined as 
, where Io is a minimum level for comparison.
A. 50,000,000
B. 2400
C. 63,000,000
D. 6,300,000
Answer: C
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Solve the problem.The total weekly earnings for a part-time job equals $6 per hour times the number of hours worked. Translate this to a formula, and use the formula to calculate the total weekly earnings for working9 hours.
A. $15 B. $6 C. $9 D. $54
The following figure has perimeter, circumference, or area as indicated. Find the value of x. Use 3.14 as an approximation for ?.A = 10
A. 2 B. 0 C. 5 D. 7
Graph the system of inequalities.x + y ? 2 y ? 2
A. 
B. 
C. 
D. 
Solve the problem.A searchlight is shaped like a paraboloid of revolution. If the light source is located 2 feet from the base along the axis of symmetry and the opening is 14 feet across, how deep should the searchlight be?
A. 0.1 ft B. 6.1 ft C. 24.5 ft D. 12.3 ft