Solve. Use ? ? 3.14 when necessary.A flagpole 24 feet tall casts a shadow that is 32 feet long. Find the length of the shadow cast by an antenna which is 15 feet tall. Round to the nearest tenth if necessary.
A. 23 feet
B. 51.2 feet
C. 11.3 feet
D. 20 feet
Answer: D
Mathematics
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Provide an appropriate response.What is the name of the point which ?1, ?2, and ?3 have in common?
A. center B. vertex C. tricenter D. ray
Mathematics
Evaluate the integral.
A. 
tan-1 
+ C
B. 
ln 
+ C
C. 
ln 
+ C
D. 2
+ 2
tan-1 
+ C
Mathematics
Find the square root.
A. 4
B. 16
C. 256
D. 
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. 100 yr B. 167 yr C. 2 yr D. 231 yr
Mathematics