Solve the problem.A chemist needs 100 milliliters of a 60% solution but has only 28% and 68% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 70 mL of 28%; 30 mL of 68%
B. 30 mL of 28%; 70 mL of 68%
C. 20 mL of 28%; 80 mL of 68%
D. 80 mL of 28%; 20 mL of 68%
Answer: C
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A. 0
B. 
C. 1
D. -1
Solve the problem. Round to the nearest hundredth, if necessary.The average middle-distance runner at a local high school runs the mile in 5.8 minutes, with a standard deviation of 0.2 minute. Find the percentage of a runners that will run the mile in less than 5.5 minutes?
A. 93.32% B. 6.68% C. 30.85% D. 69.15%
Use a spherical coordinate integral to find the volume of the given solid.The solid between the spheres 
and 
A. 
?
B. 
?
C. 
?
D. 
?
Find the perimeter and area of the figure.
A. perimeter: 1
in; area: 
sq ft;
B. perimeter: 1
ft; area: 
sq ft
C. perimeter: 
ft; area: 
sq ft
D. perimeter: 1
ft; area: 
sq ft