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 . ? 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