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. 
B. 
C. no solution; ?
D. infinitely many solutions; {
y = 4x + 4} or {
y = 9x + 5}
Answer: A
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Which of the following is the graph of 
on a horizontal span of 0 to 4.5?
?
A. 
B. 
C. ?
D. 
Use algebraic and/or graphical methods to solve the inequality.
? 
A. -6 ? x ? 1 or x ? 
B. -6 < x < 1 or x ? 
C. -1 < x < 6 or x > 
D. -1 ? x ? 6 or x ? 
Perform the indicated operations and simplify the result so there are no quotients to complete the identity.csc ?(sin ? + cos ?) = ?
A. sec ? csc ? B. 1 + cot ? C. sin ? tan ? D. -2 tan2?
Solve.The maximum number of volts, E, that can be placed across a resistor is given by the formula 
where P is the number of watts of power that the resistor can absorb and R is the resistance of the resistor in ohms. If a 
-watt resistor has a resistance of 400 ohms, find the largest number of volts of electricity that could be placed across the resistor.
A. 10 volts B. 5 volts C. 20 volts D. 100 volts