Solve the system of equations by the elimination method. Check your solutions. For any dependent equations, write your answer in ordered pair form.
A. ?
B. {(3, 5)}
C. {(-3, 4)}
D. {(-4, 5)}
Answer: C
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Find the mean of the random variable x associated with the probability density function over the indicated interval.
?
; 
?
A. ?
B. ?
C. 
D. ?
E. ?
Find the period of the function.y = 2.5 cos 6x
A. 2?
B. 2.5
C. 
D. 
Compute the discriminant. Then determine the number and type of solutions for the given equation.2x2 = -2x - 5
A. 44; two unequal real solutions B. 0; one real solution C. -44; no real solution D. -36; no real solution
Set up the payoff matrix and decide on the best strategy.A state is considering conducting an anti-smoking campaign for adults, youth, or both. Its costs, if there is a cause-effect relationship between smoking and cancer, are $751,000 for adults, $815,000 for youth and 
for both. If there is no cause-effect relationship, then the cost is $758,000 for youth, $827,000 for adults, and $1,142,000 for both. Whom should the state target in the campaign?
A. 
B. 
C. 
D. 