Solve the equation and check the solution.-6b + 2 + 4b = -3b + 7
A. b = -5
B. b = 2
C. b = -2
D. b = 5
Answer: D
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Find the expected value of the random variable.The random variable X is the number of complaints per day received by a business bureau.. Find the expected number of complaints per day. 
A. 2.85 B. 2.98 C. 3.01 D. 2.73
The function f is one-to-one. Find its inverse.f(x) = 
A. f-1(x) = 
B. f-1(x) = -2x
C. f-1(x) = 
D. f-1(x) = 2x
Solve the equation. Use words or set notation to identify equations that have no solution, or equations that are true for all real numbers. 4(x + 5) = 4x + 20
A. {40} B. {x|x is a real number} C. ? D. {0}
Solve the problem.The recycling process for aluminum cans is not perfectly efficient, and only a portion of the material of a particular can ends up in the next generation of cans. The "effective mass" of a can is its initial mass plus the cumulative mass of aluminum that it passes on to subsequent recycling generations. If the recycling process is 90% efficient, find the effective mass of a 13.5 gram can. Round to the nearest gram.
A. 137 g B. 10 g C. 135 g D. 136 g