Simplify.
A. 5
B. 
C. 
D. 
Answer: A
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Solve the equation. If the equation is an identity or a contradiction, state this.10x - 7 = 50 - 9x
A. x = 57 B. x = -3 C. x = 3 D. x = 43
Find the indicated probability. Round your answer to 6 decimal places when necessary.You are dealt two cards successively (without replacement) from a shuffled deck of 52 playing cards. Find the probability that both cards are black.
A. 
B. 
C. 
D. 
Solve the problem. If the base of the log is not specified, assume that it is 10.The loudness of a sound can be approximated by the formula d = 10 log 
, where d is the number of decibels. The higher the value of d, the louder the sound. Find the number of decibels when 
and 
A. 14 decibels B. 10,000 decibels C. 40 decibels D. 4 decibels
Graph the parabola or ellipse. Include the directrix that corresponds to the focus at the origin.r = 
A. 
B. 
C. 
D. 