Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 92% of the isotope left?
A. 251 yr
B. 417 yr
C. 400 yr
D. 800 yr
Answer: B
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For the graph below, use the nearest neighbor algorithm to find an approximate minimum Hamilton circuit and its weight, starting at the indicated vertex.
Starting at D
A. D ? C ? A ? B ? E ? D; weight = 31 B. D ? E ? A ? B ? C ? D; weight = 30 C. D ? B ? E ? C ? A ? D; weight = 30 D. D ? A ? E ? B ? C ? D; weight = 28
Find all real solutions to the equation.
- 
= 3
A. {2, 38} B. {-2} C. {2} D. {3, 8}
Write the system in the form 
Then solve the linear system by computing 
with a calculator. Round numbers to the nearest tenth, as necessary.2.5x + 1.1y - 3.5z = 4.05.2x - 5.4y + 0.6z = -2.33.5x + 4.3y + 3.5z = 11.4
A. (2.3, 3.1, 0.4) B. (1.2, 1.6, 0.2) C. (4.6, 6.3, 0.7) D. (0.6, 0.8, 0.1)
Solve the problem.The distance d in miles that can be seen on the surface of the ocean is given by 
where h is the height in feet above the surface. How high (to the nearest foot) would a platform have to be to see a distance of 
A. 92 B. 132 C. 158 D. 96