Write an equation to describe the variation. Use k for the constant of variation.P varies jointly with R and S.
A. PRS = k
B. P = kRS
C. P + R + S = k
D. P = k + R + S
Answer: B
Mathematics
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y?? ? 5y? ? 24y = 0, y (0) = 0, y?(0) = 2
Solve the initial-value problem.
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Find an equation for the ellipse described.Focus at (-3, 0); vertices at (±5, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Write as a proportion.If 2 pounds of coffee costs $12, then 7 pounds will cost $42.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics
A survey showed that students had these preferences for instructional materials. Use the graph to answer the question.
About how many students would you expect to prefer films in a school of 850 students?
A. About 170 students B. About 20 students C. About 102 students D. About 153 students
Mathematics