Subtract and simplify.
- 
A. 
B. 
C. 
D. 
Answer: A
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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 1200 years. How many years would be required for a given amount of this isotope to decay to 70% of that amount?
A. 360 yr B. 2084 yr C. 547 yr D. 617 yr
Solve the problem.Find the length of the two missing sides of a right triangle given that one angle is 38.9° and the length of the side adjacent to the angle is 4.0 centimeters. Round the length of the sides to one decimal place.
A. 3.1 cm; 2.3 cm B. 2.3 cm; 2.5 cm C. 3.1 cm; 2.5 cm D. 2.3 cm; 3.3 cm
Simplify the complex fraction.
A. 
B. 
C. 
D. 
E. 
Find the LCD for the set of fractions.
, 
A. 336 B. 84 C. 40 D. 4