Solve the problem.Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after x years can be described by 
. How much is remaining after 143 years? Round the answer to the nearest hundredth of a milligram.
A. 0.05 mg
B. 2182.55 mg
C. 308.31 mg
D. 4.58 mg
Answer: D
Mathematics
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Solve the equation.
= 13
A. 16 B. 17 C. 52 D. 3
Mathematics
Write the expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression.cos2 60° - sin2 60°
A. - 
B. 
C. 
D. - 
Mathematics
Multiply. Simplify your answer if possible.-7y(8y2 - 2y + 12)
A. -56y3+ 14y2 - 84y B. -56y2 + 14y - 84 C. -56y3+ 14y2 + 12 D. -56y3- 2y + 12
Mathematics
Simplify the expression by using the order of operations.5 ? 9 + 6(4 + 2) + 5
A. 111 B. 455 C. 86 D. 76
Mathematics