Find an equation of variation for the given situation.y varies jointly as x and z, and y = 240 when x = 8 and z = 6
A. y = 7xz
B. y = 30x
C. y = 
D. y = 5xz
Answer: D
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Use the at least once rule to find the indicated probability.In a blood testing procedure, blood samples from 6 people are combined into one mixture. The mixture will only test negative if all the individual samples are negative. If the probability that an individual sample tests positive is 0.08, what is the probability that the mixture will test positive?
A. 1.00 B. 0.606 C. 0.394 D. 0.000000262
Graph the parametric equation for the given interval. Add arrows to show how the curve is traced out. x = 
t2, y = 2t; -3 ? t ? 3
A. 
B. 
C. 
D. 
Solve the problem.The original price on a shirt is $10.26. If you receive a $2.72 discount, how much does the shirt cost?
A. $8.26 B. $12.98 C. $7.54 D. $12.26
A formula is given along with the values of all but one of the variables in the formula. Find the value of the variable not given.P = 2L + 2W; L = 7, W = 6
A. 26 B. 20 C. 13 D. 84