Solve the equation.
+ 
= 4
A. -3
B. 3
C. 3, 
D. No solution
Answer: C
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Let A and B be sets with cardinal numbers, n(A) = a and n(B) = b, respectively. Decide whether the statement is true or false.(B ? A) ? B
A. True B. False
Solve the problem.V = 
?r3, where r is the radius, in centimeters. By approximately how much does the volume of a sphere increase when the radius is increased from 2 cm to 2.1 cm? (Use 3.14 for ?.)
A. 5.2 cm3 B. 5.0 cm3 C. 0.3 cm3 D. 4.8 cm3
Solve the problem.A power boat in still water maintains a speed of 30 miles per hour. The boat heads directly across a river perpendicular to the current which has a speed of 8 miles per hour. Find the actual speed and direction of the boat.
A. 16 miles per hour; 30° off course B. 15 miles per hour; 32° off course C. 31 miles per hour; 15° off course D. 30 miles per hour; 15° off course
Find the standard-form equation for an ellipse which satisfies the given conditions.An ellipse centered at the origin having vertex at (0, -3) and eccentricity equal to 
A. 
+ 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
+ 
= 1