What is the probability of obtaining at least one head when a coin is flipped four times?
?
A. 
B. 
C. 
D. 
E. 
Answer: D
Mathematics
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Solve the system by elimination.x + 7y = 75x - 4y = -4
A. {(0, 0)} B. {(1, 0)} C. {(1, 1)} D. {(0, 1)}
Mathematics
Find the standard equation of the parabola that satisfies the given conditions. Vertex: (3, -4); directrix: x = 11
A. (y + 4)2 = -32(x - 3) B. x2 = -32(y - 3) C. (x + 4)2 = -32(y - 3) D. (y - 3)2 = -32(x + 4)
Mathematics
Solve.
= 
A. - 
, 
B. 2, 4
C. -2, -4
D. -2, 4
Mathematics
Add or subtract as indicated. Write the answer in simplest form.
+ 
A. 
B. 
C. 
D. 
Mathematics