Subtract.- 
A. 19.55
B. 19.15
C. 18.55
D. 19.65
Answer: C
Mathematics
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Solve the problem.A bacteria colony doubles in 4 hr. How long does it take the colony to triple? Use N = N0 2t/T, where N0 is the initial number of bacteria and T is the time in hours it takes the colony to double. (Round to the nearest hundredth, as necessary.)
A. 12 hr B. 1.62 hr C. 6 hr D. 6.34 hr
Mathematics
Match the given equation with one of the graphs.9x2 - 36y2 = 324
A. 
B. 
C. 
D. 
Mathematics
Rationalize the denominator. Simplify, if possible. Assume that any variables represent positive real numbers. 
A. 
B. 
C. 
D. 
Mathematics
Simplify.0.473 + 8.66 ÷ 0.04
A. 228.325 B. 221.23 C. 216.973 D. 22.123
Mathematics