Use the substitution method to solve the system. x + 8y = -162x + 9y = -18
A. (2, 0)
B. (1, -3)
C. (0, -2)
D. No solution
Answer: C
Mathematics
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Provide an appropriate response.True or False? Pure water is neutral and has a pH of 0.
A. False B. True
Mathematics
Use identities to write each expression as a function of ?.cos (? + 90°)
A. cos ? B. -sin ? C. -cos ? D. sin ?
Mathematics
Factor the expression completely.
?
?
A. 
B. 
C. 
D. 
Mathematics
Perform the indicated operation(s). Simplify if possible.
+ 
- 
A. 
B. 
C. 
D. 
Mathematics