Find the distance between the pair of points. Express your answer in simplest radical form.(4, -5) and (1, -6)
A. 10 units
B. 2
units
C. 8 units
D. 
units
Answer: D
Mathematics
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Solve the problem.In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that 
, when t is measured in hours. If there are 
of reactant present when t = 0, how many grams will be left after 
? Give your answer to the nearest tenth of a gram.
A. 5.9 g B. 4 g C. 2 g D. 0.1 g
Mathematics
Find the unknown length in the right triangle. Give an exact answer.
A. b = 
B. b = 2
C. b = 
D. b = 2
Mathematics
Decide whether the equation is or is not an identity.tan (? + ?) = tan ?
A. Not an identity B. Identity
Mathematics
Solve the equation and check your solution.
+ 
= 
A. x = 8, x = 1 B. x = 1 C. x = -8, x = -1 D. x = -8, x = 1
Mathematics