Solve the problem.Under certain conditions, the electric current i in a circuit containing a resistance R and an inductance L is given by 
, where t is the time (in seconds), and I is the current at t = 0. Calculate how long (in seconds) it takes the current to reach 0.400 of the initial value, if 
and 
A. 0.22 seconds
B. 0.14 seconds
C. 0.06 seconds
D. 2.68 seconds
Answer: B
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Use a proportion to solve the application.Five out of 10 adults in a certain city reported they receive more email than they can read. If this city has 53,000 adults, how many reported that they receive more email than they can read?
A. 10,600 adults B. 26,500 adults C. 2650 adults D. 1060 adults
Write the equation in exponential form.log1/464 = -3
A. 641/4 = 3
B. (
)3 = 64
C. (
)-3 = 64
D. (-3)1/4 = 64
Find the slope of the line containing the pair of points.(-9, 10) and (-9, -3)
A. 0
B. - 
C. undefined
D. - 
Suppose that 30% of all small businesses are undercapitalized, 40% of all undercapitalized small business fail, and 20% of all small businesses that are not undercapitalized fail. A small business is chosen at random and is found to have failed. Find the probability that the business was undercapitalized.
A. 
B. 
C. 
D. 
E. none of these