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 k = 0.2, how long will it take a battery to reach a 30% charge? Assume that the battery was fully discharged when it began charging. Round to one decimal place.
?
A. 0.2 minutes
B. 6.0 minutes
C. 2.6 minutes
D. 1.8 minutes
E. 0.8 minutes
Answer: D
Mathematics
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Use a graphing calculator to find the indicated limit by plotting the function near the limit point.
A. 0 B. 16 C. 2 D. 1
Mathematics
Sales S, in thousands of dollars, t months after the beginning of the year are given by 
.
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The formula is valid over a 12-month period. Over what period were sales increasing? A graph of S versus t can help you answer this question.
A. From month 3 to the end of the year B. From month 6 to the end of the year C. Over the first 3 months D. Over the first 6 months
Mathematics
Write the system of linear equations that the augmented matrix represents.
A.
| 2x | + 4y | + 5z | = -2 |
| 5x | + 3z | = 4 |
| 5x | + 3y | = 2 |
B.
| 2x | + 4y | + 5z | = -2 |
| 3x | + 5z | = -4 |
| 5x | + 3y | = 2 |
C.
| 2x | + 4y | + 5z | = -2 |
| 3x | + 5z | = 4 |
| 5x | + 3y | = 2 |
Mathematics
Perform the matrix operation.Given A = 
and I = 
, find IA.
A. 
B. 
C. 
D. 
Mathematics