Write the expression in standard form.(7 - 8i) + (3 + 3i)
A. 10 + 5i
B. 10 - 5i
C. -10 + 5i
D. 4 + 11i
Answer: B
Mathematics
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List the indicated feature of the figure.The faces of
A. 
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, 
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, 
, 
B. Cannot be identified
C. A, B, C, D, E, F, G, H
D. ?ABCD, ?ABGF, ?AFED, ?BCGH, ?CHED, ?EFGH
Mathematics
Solve the problem.In the formula A(t) = A0ekt, A is the amount of radioactive material remaining from an initial amount A0 at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope decays at a rate of 0.3% annually. Determine the half-life of this isotope, to the nearest year.
A. 231 yr B. 167 yr C. 2 yr D. 100 yr
Mathematics
Solve.2c + 5 - c = 14
A. 19 B. 9 C. -9 D. -19
Mathematics
Find the area of the surface obtained by rotating the circle 
about the line y = 7.
Mathematics