What part of the object or set of objects is shaded?
A. 
B. 
C. 
D. 
Answer: C
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City water, which is slightly chlorinated, is being used to flush a tank of heavily chlorinated water. The concentration C, in milligrams per gallon, of chlorine in the tank 
hours after flushing begins is given by
?
.
The water in the tank is safe for use when chlorine levels are less than 2.50 milligrams per gallon. For what values of t is the water in the tank safe for use? Round your answer to two decimal places.
?
A. 
hours
B. 
hours
C. 
hours
D. 
hours
Graph the inequality.2x + 5y ? -10
A. 
B. 
C. 
D. 
Solve the initial value problem.Differential Equation: 
= i + (6t3 - 3t)j + 
kInitial Condition: r(0) = 2j + (ln 8)k
A. r(t) = ti + 
j + ln(t + 8)k
B. r(t) = i + 
j + (ln 8)k
C. r(t) = ti + 
j + (ln 8)k
D. r(t) = ti + 
j + (ln t)k
Solve the system of equations by elimination.
A. x = 3, y = 5.5; (3, 5.5) B. x = 5.5, y = 8.5; (5.5, 8.5) C. x = 5.5, y = -8.5; (5.5, -8.5) D. x = 3, y = -8.5; (3, -8.5)