How much will be left after 231 years? Compute the answer to three significant digits.

The radioactive element americium-241 has a half-life of 432 years. Suppose we start with a 20-g mass of americium-241.

A) 13.8 g B) 14.9 g C) 16.1 g D) 16.7 g


A) 13.8 g

Mathematics

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Use =, <, or > to write a true statement.  

A. = B. < C. >

Mathematics

Find the measures of two angles, one positive and one negative, that are coterminal with the given angle.192°

A. 552°, -168° B. 462°, -78° C. 552°, -258° D. 372°, -168°

Mathematics

Solve the equation.x2 + 5x = 84

A. -12, 1 B. 12, 7 C. -12, 7 D. 12, -7

Mathematics

Find the square root and simplify. Round to the nearest thousandth if necessary.

A. 10.630 B. 10.724 C. 10.645 D. 10.617

Mathematics