Write the series using summation notation.18 + 28 + 38 + 48 + ...
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.The displacement y (in cm) of an object hung vertically from a spring and allowed to oscillate is given by the equation 
where t is the time (in s). By multiplication of series, find the first three terms of the expansion for the displacement of the oscillating object.
A. 6t + 2.4t2 - 1.76t3 + . . . B. 6t + 1.2t2 + 0.12t3 + . . . C. 6t + 1.2t2 - 0.88t3 + . . . D. 6t + 0.6t2 - 0.92t3 + . . .
Solve. Write the answer as a mixed number in simplest form.Mark is filling decorative oil lamps for a reception. Each lamp can hold 
cup of oil. Mark has 4
cups of oil available. How many oil lamps can Mark fill completely?
A. 9 oil lamps
B. 10 oil lamps
C. 11 oil lamps
D. 8
oil lamps
Find the principal square root of the number. Approximate the answer to the nearest hundredth whenever appropriate.(ab)2, ab < 0
A. -ab, ab B. 2ab C. -ab D. ab
Solve the problem.The temperature at 5:00 was -7° C. Four hours later, it was -8° C. What was the change in temperature?
A. 15° C B. 1° C C. -15° C D. -1° C