Write the expression in the standard form a + bi.(-5 + 4i)(3 + i)
A. -11 + 7i
B. -11 - 17i
C. -19 + 7i
D. -19 - 17i
Answer: C
Mathematics
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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) = 750e-0.033t, where t is the time in years? Round to the nearest hundredth.
A. 24.75 yr B. 221.61 yr C. 21.00 yr D. 200.61 yr
Mathematics
Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.
Mathematics
Solve the equation.5-x = 
A. {-3}
B. 
C. 
D. {3}
Mathematics
Approximate the area under the graph of f(x) and above the x-axis using n rectangles.f(x) = 3x2 - 2 from x = 1 to x = 5; n = 4; use right endpoints
A. 144 B. 140 C. 150 D. 154
Mathematics