Perform the indicated operations and express your answer in the form a + bi. 
A. -3i
B. ±3
C. -i
D. 3i
Answer: D
Mathematics
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Find the value of a? so that the slope of the line joining points P(a, 6) and Q(4, 4) is equal to 4. ?
A. ?
B. ?
C. ?
D. ?12
E. ?
Mathematics
List the intercepts for the graph of the equation.y = -2x
A. (0, -2) B. (0, 0) C. (-2, 0) D. (-2, -2)
Mathematics
Determine whether the system is a nonlinear system or a linear system.
A. nonlinear system B. linear system
Mathematics
Solve the problem.How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t) = 300e-0.101t, where t is the time in years? Round to the nearest hundredth year.
A. 56.47 years B. 63.34 years C. 30.30 years D. 6.86 years
Mathematics