If M is the theoretical maximum charge that a battery can hold and k is a positive constant that depends on the battery and the charger, the length of time (in minutes) required to charge the battery to a given level C is given by
?
.
?
If 
, how long will it take a battery to reach a 70% charge? Assume that the battery was fully discharged when it began charging. Round your answer to the nearest tenths.
?
A. 4.0 minutes
B. 2.7 minutes
C. 0.2 minutes
D. 9.3 minutes
E. 0.0 minutes
Answer: D
Mathematics
You might also like to view...
Solve by the elimination method. 7x + 8y = 51 3x + 5y = 25
A. No solution B. {(5, 3)} C. {(5, 2)} D. {(4, 3)}
Mathematics
Simplify.
A. 77
B. 7
C. 11
D. 23
Mathematics
Solve the equation. Check your solution.-8(2 + x) = -24
A. {-26} B. {5} C. {1} D. {-22}
Mathematics
Solve the inequality.(a + 6)(a - 1)(a - 5) > 0
A. (5, ?) B. (-6, 1) or (5, ?) C. (-?, 1) D. (-?, -6) or (1, 5)
Mathematics