Find the exact or approximate circumference of the circle, as indicated.Find the exact circumference.
A. 7225? mi
B. 85? mi
C. 170? mi
D. 42.5? mi
Answer: C
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Identify which of these types of sampling is used: simple random, stratified, systematic, or convenience.A market researcher selects 500 people from each of 10 cities.
A. Convenience B. Simple random C. Stratified D. Systematic
Solve the problem.How many seconds after the switch in an RL circuit is closed will it take the current i to reach 
of its steady state value? Express answer in terms of R and L and round coefficient to the nearest hundredth.
A. 1.05 L/R seconds B. 1.25 L/R seconds C. 0.43 L/R seconds D. 0.63 L/R seconds
Identify the coefficient and degree of the monomial. -5
A. Coefficient: 0; Degree: -5 B. Coefficient: 1; Degree: 0 C. Coefficient: -5; Degree: 0 D. Coefficient: 1; Degree: -5
Write the expression in lowest terms. Assume that all variables represent positive real numbers.
A. 3 + 3
B. 3 + 3
C. 
D. 