Solve the problem.A promotional deal for long distance phone service charges a $15 basic fee plus $0.05 per minute for all calls. If Joe's phone bill was $66 under this promotional deal, how many minutes of phone calls did he make? Round to the nearest integer, if necessary.
A. 3 minutes
B. 1020 minutes
C. 1620 minutes
D. 10 minutes
Answer: B
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Solve the given differential equation. (The form of yp is given.)D2y + 7Dy + 12y = 2x (Let yp = A + Bx.)
A. y = c1e-3x + c2e-4x + 
- 
x
B. y = c1e-3x + c2e-4x - 
+ 
x
C. y = c1e3x + c2e4x - 
+ 
x
D. y = c1e-3x + c2e-4x + 
x
Find the derivative of y with respect to x.y = sin-1 (e5t)
A. 
B. 
C. 
D. 
Solve the problem.Find the correct sum for the base four addition fact.2four + 3four = 3four + 2four = ?
A. 5four B. 10four C. 12four D. 11four
Express the given logarithm as a sum and/or difference of logarithms. Simplify, if possible. Assume that all variables represent positive real numbers.log4
A. 
log4p + 
log4q - 
log4t
B. 
log4p + 
log4q - 2 log4t
C. 
log4p ? 
log4q ÷ 2 log4t
D. 3 log4p + 5 log4q - 2 log4t