Find the indicated term for the sequence.an = n2 - n; a10
A. -90
B. 90
C. 110
D. 10
Answer: B
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Complex numbers are used in electronics to describe the current in an electric circuit. Ohm's law relates the current in a circuit, I, in amperes, the voltage of the circuit, E, in volts, and the resistance of the circuit, R, in ohms, by the formula 
Solve the problem using this formula.Find E, the voltage of a circuit, if I = (18 + i) amperes and R = (3 + 2i) ohms.
A. (52 - 39i) volts B. (18 - 39i) volts C. (18 + 39i) volts D. (52 + 39i) volts
Find the LCD for the given fractions.
and 
A. 4 B. 56 C. 180 D. 720
Find all values of the variable for which the rational expression is undefined. State "no values" if none exist.
A. 6, -6 B. 0 C. -7, -3 D. 7, -3
Solve the problem.Coffee is best enjoyed at a temperature of 124°F. A restaurant owner wants to discover the temperature T at which he should serve his coffee so that it will have cooled to this ideal temperature in 5 minutes. He discovers that a cup of coffee served at 200°F cools to 185°F in one minute when his restaurant is at 75°F. If he maintains the restaurant temperature at 75°F, at what temperature should he serve the coffee to meet his goal? Use Newton's law of cooling, f(t) = T0 + Ce-kt, where f(t) is the temperature at time t after being introduced into an environment with a constant temperature T0 and C and k are constants.
A. 163°F B. 188°F C. 200°F D. 168°F