Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(-3, 0)}
B. {(1, 2)}
C. no solution; ?
D. {(0, 3)}
Answer: D
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Solve the equation.12(9t + 45) = 12(9t + 45)
A. 8 B. 2 C. 1 D. all reals E. no solution
Solve the problem.Suppose y = mx + b is a mathematical model for actual time as a function of estimated time, where y represents actual time and x represents estimated time and m and b are constants. If m = 0.8 and b = -2.1, find y when x is 60 min.
A. 45.9 min B. 50.1 min C. 61.68 min D. 58.32 min
Solve the problem with estimation, but do not use a calculator. Use rounding to make the resulting calculations simple.If a person earns $19,800 per year, estimate that person's hourly salary.
A. $50 B. $10 C. $40 D. $100
Solve the problem.Find the sum of the series 
. [Hint: Write the series as 1 + 
= 1 + 
+ 
.]
A. 3(e - 1) B. e + 3 C. 2e D. 4e - 5