Determine whether the study is an experiment or an observational study.A pollster obtains a sample of students and asks them how they will vote on an upcoming referendum.
A. experiment
B. observational study
Answer: B
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Find the indicted product and simplify if possible.The area of annulus (washer) is given by 
.
A. 
B. 
C. 
+ 
D. 
Simplify the expression.12x + 12 - 28x - 4
A. 40x + 16 B. -16x + 12 - 4 C. 16x + 8 D. -16x + 8
Find the indicated part of the arithmetic sequence.Find the common difference of the sequence in which the first term is 5 and the 85th term is 12.
A. -7
B. - 
C. 7
D. 
Solve the problem.Jamil always throws loose change into a pencil holder on his desk and takes it out every two weeks. This time it is all nickels and dimes. There are 3 times as many dimes as nickels, and the value of the dimes is $2.50 more than the value of the nickels. How many nickels and dimes does Jamil have?
A. 11 nickels and 33 dimes B. 9 nickels and 27 dimes C. 30 nickels and 10 dimes D. 10 nickels and 30 dimes