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 4 years. If necessary, round to three decimal places.
A. 0.324
B. 304.693
C. 3046.927
D. 0.032
Answer: A
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Express the area of the region bounded by the given line(s) and/or curve(s) as an iterated double integral.The curves 
and 
A. 
B. 
C. 
D. 
Solve the trigonometric equation symbolically, graphically, or numerically for 
2 sin2 ? - 1 = 0
A. ? = 45°, 135°, 225°, 315° B. ? = 60°, 120°, 240°, 300° C. ? = 45°, 135° D. ? = 60°, 120°
Use negative exponents where necessary to write the expression with all variables in the numerator of a term. That is, write each term in the form cxn if the term contains a variable.y = 6x - 4 + 
- 
+ 
A. y = 6x - 4 + (8x)-4 - x-1/2 + (1x)-2/3 B. y = 6x - 4 + 8x-4 - x-2 + 1x-3/2 C. y = 6x - 12 + x-4 - x-1/2 + x-2/3 D. y = 6x - 4 + 8x-4 - x-1/2 + 1x-2/3
Find the real solutions, if any, of the equation. Use the quadratic formula.4x2 + 6x = - 1
A. {
, 
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B. {
, 
}
C. { 
, 
}
D. {
, 
}