Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 3 years. If necessary, round to three decimal places.
A. 297.633
B. 0.006
C. 0.056
D. 2976.328
Answer: C
Mathematics
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Find the average value of the function f over the given region.f(x, y) = 
over the square 1 ? x ? 9, 1 ? y ? 9.
A. 
B. 
C. 
D. 
Mathematics
Evaluate the integral.
A. 26 B. 23.2 C. 22 D. 28
Mathematics
Find all real numbers in the interval [0, 2?) that satisfy the equation.cos2x + 2 cos x + 1 = 0
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Students in Mr. Mason's classes collected items from different countries. The data show how many of each item one class collected. Make a bar graph of these data showing frequency on the vertical axis.
What will be an ideal response?
Mathematics