Use the laws of exponents to simplify each expression using positive exponents only. Assume all variables represent nonzero real numbers.(x-7)-3
A. 
B. 
C. -x10
D. x21
Answer: D
Mathematics
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Solve the problem.In the formula N = Iekt, N is the number of items in terms of an initial population I at a given time t and k is a growth constant equal to the percent of growth per unit time. How long will it take for the population of a certain country to triple if its annual growth rate is 5.7%? Round to the nearest year.
A. 19 yr B. 8 yr C. 53 yr D. 1 yr
Mathematics
Solve the absolute value equation.|9x - 8| = 0
A. 
B. 
C. 
D. ?
Mathematics
Graph the numbers on a number line.- 
, -2, 0, 
A. 
B. 
C. 
D. 
Mathematics
Find the foci of the ellipse.
+ 
= 1
A. (-4, 4), (12, 4) B. (4, -4), (4, 12) C. (4, -2), (4, 10) D. (4, -6), (4, 14)
Mathematics