Solve the equation.
= 3
A. 
B. {7, 13}
C. {-13, 7}
D. 
Answer: D
Mathematics
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The amount A, in grams, of a radioactive substance remaining after t years is given by the following table. Use an exponential model for these data to determine the half-life of the radioactive substance. That is, determine how long it takes for half of the substance to decay. Round your answer to two decimal places. t 3 4 5 6 A 157.36 154.21 151.13 148.11?
A. 25.46 years B. 34.50 years C. 34.31 years D. 25.00 years
Mathematics
Solve the system by the addition method.9x - 7y = -61-3x - 2y = 16
A. {(-6, 2)} B. {(-7, 2)} C. {(-6, 1)} D. ?
Mathematics
Simplify the expression.
A. 
B. 8
C. 4096
D. not a real number
Mathematics
Find all solutions of the equation: 
a. 
b. 
c. 
d. 
Mathematics