The temperature on a certain day as measured at the airport of a city is changing at the rate of
?
?
F/hr, where t is measured in hours, with 
corresponding to 6 a.m. The temperature at 6 a.m. was 23F. What was the temperature at 9 a.m.? Please round your answer to whole degrees.
?
A. 
B. 
C. 
D. 
E. 
Answer: C
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Write the augmented matrix for the system. 7x + 2y + 6z = 71 8x + 3y + 8z = 83-2x + 5y + 2z = -11
A. 
B. 
C. 
D. 
Solve.The function N(t) = 
, t ? 8gives the body concentration N(t), in parts per million, of a certain dosage of medication after time t, in hours.Graph the function on the interval [8, ?) and complete the following:N(t) ? 
as t ? ?.
A. 
N(t) ? 0 as t ? ?.
B. 
N(t) ? 1 as t ? ?.
C. 
N(t) ? 0.071 as t ? ?.
D. 
N(t) ? 0.083 as t ? ?.
The graph of a function is given. Decide whether it is even, odd, or neither.
A. even B. odd C. neither
Add or subtract. Then simplify. If a denominator has two or more factors (other than monomials), leave it in factored form. Express the answer using the denominator of the first fraction when applicable.
- 
A. 
B. 
C. 
D. 