Use an Euler diagram to determine whether the argument is valid or invalid.All rock stars are performers.
Therefore, Meg is a rock star.
A. valid
B. invalid
Answer: B
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How would you find the area of a circle, given the area of the sector with radius 30 feet, and central angle 120?? ??
A.
120? is 1/4 of a circle's revolution; Therefore, the area of the circle is 4 times the area of the sector.
B.
?120? is 1/3 of a circle's revolution; Therefore, the area of the circle is 3 times the area of the sector.
C.
?120? is 1/4 of 180?; Therefore, the area of the circle is 4 times the area of the sector.
D.
?The area of the circle is: 
.
E.
?b and d are correct.
What does the circuit symbol in the figure mean?
?
?
A. AND-gate B. NOT-gate C. Switch D. Battery E. OR-gate
Solve the problem.The position of a particle at time t is given by s, where 
. Find the velocity 
A. ds/dt = 
B. ds/dt = 
C. ds/dt = 
D. ds/dt = 
Write the expression in the form a + bi.
A. 
- 
i
B. 
- 
i
C. 
- 
i
D. 
- 
i