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. {(2, 8)}
B. {(-2, 8)}
C. {(2, -8)}
D. {(-2, -8)}
Answer: D
Mathematics
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Express the following using negative exponents.
A. 3-b-1 B. b-3 C. 3-b D. b3
Mathematics
Express the interval in set-builder notation and graph the interval on a number line.(-?, 4.5]
A. {
x > 4.5}
B. {
x ? 4.5}
C. {
x < 4.5}
D. {
x ? 4.5}
Mathematics
Solve by graphing.The cost y (in hundreds of dollars) of tuition at one community college is given by the linear equation 
where x is the number of credits for which a student registers. Graph the equation and use the graph to estimate the cost of tuition if a student registers for 14 credits. 
A. $2900 B. $2500 C. $1700 D. $1950
Mathematics
Divide.
A. -3x2 - 4x - 1
B. -3x2 - 4x - 1 + 
C. -3x2 - 4x - 1 + 
D. x2 - 1 + 
Mathematics