Solve the problem.If the switch is thrown open after the current in an RL circuit has built up to its steady-state value, the decaying current obeys the equation 
How long after the switch is thrown open will it take the current to fall to 
of its original value?
A. 1.12 L/R seconds
B. -4.60 L/R seconds
C. -4.40 L/R seconds
D. 0.92 L/R seconds
Answer: D
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Write an equivalent sentence for the statement.An number n is divisible by 3 if and only if the sum of the digits of n is divisible by 3. (Hint: Use the fact that 
is equivalent to 
A. If a number n is divisible by 3 then the sum of the digits of n is divisible by 3, or if the sum of the digits of n is divisible by 3 then the number n is divisible by 3. B. The sum of the digits of n is divisible by 3 or the number n is divisible by 3. C. A number n is divisible by 3 and the sum of the digits of n is divisible by 3. D. If a number n is divisible by 3 then the sum of the digits of n is divisible by 3, and if the sum of the digits of n is divisible by 3 then the number n is divisible by 3.
Write a numerical expression for the phrase and simplify it.The product of 
and 
, divided by - 
.
A. 
; - 
B. 
; - 
C. 
; - 
D. 
; - 
Perform the indicated operations.-8.6 + (-2.8)
A. 5.8 B. -5.8 C. 11.4 D. -11.4
Solve.The Neighborhood Lemonade Stand, Inc. reported net incomes of -$269, -$490, and -$446 for the past three years. What was its total net income for these three years?
A. $1,205 B. -$1,205 C. -$936 D. -$759