Use the rules of exponents to simplify the expression. Write the answer with positive exponents. Assume that all variables represent positive real numbers.z-2/5 ? z3/5
A. z1/5
B. z5/6
C. z6/5
D. z-1/5
Answer: A
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Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.y = 6x2, y = 6
A. 54?
B. 
?
C. 
?
D. 
?
Write the polynomial in descending order and identify its degree.-4z7 + 2z8
A. -2z2 ; degree: 7 B. -4z7 + 2z8 ; degree: 8 C. -2z15 ; degree: -4 D. 2z8 - 4z7 ; degree: 8
Solve the problem.The population of a particular city is increasing at a rate proportional to its size. It follows the function 
where k is a constant and t is the time in years. If the current population is 12,000, in how many years is the population expected to be 30,000? (Round to the nearest year.)
A. 88 yr B. 7 yr C. 8 yr D. 15 yr
Evaluate the expression for the given replacement values. Write the answer in simplest form.
for x = 
, y = 
A. 
B. 
C. 
D. 