Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope has a half-life of approximately 1,850 years. How many years would be required for a given amount of this isotope to decay to 55% of that amount?
A. 1,541 yr
B. 1,596 yr
C. 2,131 yr
D. 832.5 yr
Answer: B
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Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.e5x - 10 - 4 = 1456
A. 1.46 B. 3.46 C. 0.63 D. 2.63
Solve the problem.Find the missing length in the following right triangle. If necessary, round to the nearest tenth. 
A. 40 mi B. 20 mi C. 6.3 mi D. 10 mi
Which software environment comes packaged with pre-made constructions for squares, parallelograms, trapezoids, and rectangles?
a. Fathom b. Shape Makers c. Mathematica d. TinkerPlots
Factor completely. If the polynomial is prime, say so.256p4 - 81q4
A. (4p + 3q)3(4p - 3q) B. (4p + 3q)(4p - 3q)(16p2 + 9q2) C. (4p + 3q)(4p - 3q)(16p2 - 9q2) D. (4p + 3q)(4p + 3q)(16p2 - 9q2)