Determine whether the variation model below is of the form 
or 
.
x
13
26
39
52
65
y
3
6
9
12
15
A.
?
B.
Answer: A
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A. 
B. 
C. 
D. 
Solve the problem.If the radius of a sphere is r feet, then the volume of the sphere is 
?r3 cubic feet. Find the volume of a sphere with radius of 9 feet. Round your answer to two decimal places.
A. 309.39 cubic feet B. 9160.91 cubic feet C. 3053.64 cubic feet D. 1526.82 cubic feet
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A. 20 mph B. 100 mph C. 50 mph D. 10 mph
Find the exact value of the expression.sin 25° cos 35° + cos 25° sin 35°
A. 
B. 
C. 
D. 