780
Answer Key
79 . a. ( m =0, b =−6) b.
⎛ ⎝ m = − 2
⎞ ⎠ b.
b =2
81 . a.
3 ,
83 . a. 2 b. 5
2 , −1; c. −5 d. Both ends rise e. Neither
85 . a. 2 b. ± 2 c. −1 d. Both ends rise e. Even
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