Solve the problem.The half-life of a radioactive element is 130 days, but your sample will not be useful to you after 80% of the radioactive nuclei originally present have disintegrated. About how many days can you use the sample?
A. 297
B. 287
C. 302
D. 312
Answer: C
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Use the shell method to find the volume of the solid generated by revolving the shaded region about the indicated line.About the line y = - 6x = y + 6
A. 
?
B. 192?
C. 
?
D. 
?
Divide numerator and denominator by the highest power of x in the denominator to find the limit.
A. ?
B. 
C. 
D. 0
Describe the level survaces of the function f(x, y, z) = 3x + 8y - 4z + 2.
What will be an ideal response?
Solve.A plot of land in the shape of a right triangle is formed by the intersection of three roads. A developer wants to purchase the land, which is priced at $7200 per acre. Calculate the cost of the land, given the dimensions shown in the figure. (Hint: One acre = 43,560 square feet. Round to the nearest hundred dollars.)
A. $18,200 B. $17,600 C. $17,400 D. $18,900