Solve the problem.A certain radioactive isotope decays at a rate of 1% per 400 years. If t represents time in years and y represents the amount of the isotope left, use the condition that 
to find the value of k in the equation 
A. -0.01005
B. 0.00003
C. 0.00673
D. -0.00003
Answer: D
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Decide whether events A and B are overlapping or non-overlapping.A student is selected at random. Event A is that the student speaks Spanish and event B is that the student speaks Chinese.
A. Non-overlapping B. Overlapping
Solve.One end guy wire is attached to the top of a 16-foot pole and the other end is anchored into the ground 9 feet from the base of the pole. Find the length of the guy wire. Round to the nearest tenth foot.
9 feet
A. 25 feet B. 18 feet C. 25.4 feet D. 18.4 feet
Use DeMoivre's Theorem to write the expression in rectangular form.(1 - i)10
A. 32 B. 32 - 32i C. -32i D. -32 + 32i
Answer the question.The table shows the number of pupils per teacher in selected states.
Which states have a figure greater than 12.5?
A. Maine B. Wyoming, Maine C. Alaska, Texas, California, Idaho, Missouri D. Alaska, Texas, California, Wyoming, Idaho, Missouri