Write the expression as one logarithm.logb x + logb y
A. log2b xy
B. logb(x + y)
C. logb xy
D. log2b(x + y)
Answer: C
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Determine if the graph of the function is concave up or concave down.y = -(x + 3)2
A. Concave up B. Concave down
A bacterial culture grows according to the formula 
. If it takes 9 days for the culture to triple in size, how long will it take to double in size? Round your answer to the nearest tenth of a day.
?
A. 6.4 days B. 6.1 days C. 6.9 days D. 5.7 days E. 5.4 days
Without graphing, answer the following questions for the linear system.(i) Is the system inconsistent, are the equations dependent, or neither?(ii) Is the graph a pair of intersecting lines, a pair of parallel lines, or one line?(iii) Does the system have one solution, no solution, or an infinite number of solutions? x - 3y = 63y + 1 = x
A. (i) neither (ii) intersecting lines (iii) one solution B. (i) inconsistent (ii) parallel lines (iii) no solution C. (i) dependent (ii) one line (iii) infinite number of solutions
A rod 
in. long has been cut as shown in the illustration. Assume the waste in each cut is 
in. What is the length of the remaining piece?
A. 
in.
B. 
in.
C. 
in.
D. 
in.
E. 
in.