Solve the system of equations using substitution.
A. x = 2 , y = -2; x = 7, y = -7
or (2, -2), (7, -7)
B. x = -2 , y = - 
; x = -7, y = - 
or 
, 
C. x = - 
, y = -7 or 
D. x = - 
, y = -2; x = - 
, y = -7
or 
, 
Answer: D
Mathematics
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Evaluate the expression without using a calculator, or state that the value does not exist. Simplify the answer to the extent possible.sech-1(ln 6)
A. 
B. 
C. 
D. does not exist
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Subtract.
- 
A. 
B. - 
C. - 
D. 
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Find the first four terms of the binomial series for the given function.(1 + 5x)1/2
A. 1 - 
x + 
x2 - 
x3
B. 1 + 
x - 
x2 + 
x3
C. 1 + 
x - 
x2 + 
x3
D. 1 - 
x + 
x2 - 
x3
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Determine whether or not the function is one-to-one.f(x) = -2.97
A. No B. Yes
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