Why did the grizzly go on a diet worksheet answer key?

Why did the grizzly go on a diet worksheet answer keyquestion 1using the property of combining and adding the like terms;     7n + 4+ 8n - 1⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻15n + 3 answer⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻question 2using the property of combining and adding the like terms;     10n² - 9+  3n² - 8⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻13n² - 17  answer⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻question 3using the property of combining and adding the like terms;     15n² - 4n+  (-2n² + n)⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻13n² - 3n  answer⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻question 4using the property of combining and adding the like terms;     5n² + 2n +3+    n² + 4n - 6⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻      6n² + 6n -3  answer⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻question 5: using the property of combining and adding the like terms;     3n² - 8n -1  + 9n² -    n + 7⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻12n² -9n +6  answer⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻question 6: using the property of combining and adding the like terms;       - 4n²+ 9n + 5+  (- 4n² - 9n + 5)⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻- 8n² +  10  answer⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻question 7: (5a² -2) + (12a² + 5) = 5a² + 12a² - 2 + 5property of combining and adding the like terms; (5a² -2) + (12a² + 5) =    17 a² + 3question 8: (-3a² -a +8) + (7a² +7a -1) = -3a² + 7a² - a + 7a + 8 - 1property of combining and adding the like terms; (-3a² -a +8) + (7a² +7a -1) =  4a² + 6a + 7question 9: (2a² -11a -4) + (-9a² - 2a -15) = 2a² - 9a² -11a - 2a - 4 - 15  property of combining and adding the like terms; (2a² -11a -4) + (-9a² - 2a -15) =  - 7a² -13a - 19  question 10: (8a + a² + 6) + (4 + a - 3a² ) =    a² - 3a² + 8a + a + 6 + 4property of combining and adding the like terms; (8a + a² + 6) + (4 + a - 3a² ) =  - 2a² + 9a + 10question 11: (3a³ +2a -3) + (8a³ - 5a -10 ) =  3a³ + 8a³ + 2a - 5a -3 - 10property of combining and adding the like terms; (3a³ +2a -3) + (8a³ - 5a -10 ) =    11a³ - 3a -13question 12: (a³ - 6a² - 7) + (-4a³ - a + 7) = a³ - 4a³ - 6a² - a -7 + 7property of combining and adding the like terms; (a³ - 6a² - 7) + (-4a³ - a + 7) =  a³ - 4a³ - 6a² - a + 0eliminating the zero; (a³ - 6a² - 7) + (-4a³ - a + 7) =  a³ - 4a³ - 6a² - aquestion 13: (2x⁴ + 5x² -13) + (-7x⁴ - 8x² + 1) = 2x⁴ -7x⁴ + 5x² - 8x² -13 + 1property of combining and adding the like terms; (2x⁴ + 5x² -13) + (-7x⁴ - 8x² + 1) = -5x⁴ - 3x² -12question 14: (- 5x⁴ + 2x³ - 8x² - x) + (x³ + 8x² - 3x - 1) = - 5x⁴ + 2x³ + x³ - 8x² + 8x² - x - 3x - 1property of combining and adding the like terms; (- 5x⁴ + 2x³ - 8x² - x) + (x³ + 8x² - 3x - 1)  = - 5x⁴ + 3x³ - 0 - 4x - 1eliminating the zero; (- 5x⁴ + 2x³ - 8x² - x) + (x³ + 8x² - 3x - 1)  = - 5x⁴ + 3x³ - 4x - 1question 15: (7x⁴ - 4x² + 12) + (- 8x⁴ + 3x³ + 4x² + x) = 7x⁴ - 8x⁴ - 4x² + 4x² + x + 12property of combining and adding the like terms; (7x⁴ - 4x² + 12) + (- 8x⁴ + 3x³ + 4x² + x) = - x⁴ + 0 + x + 12(7x⁴ - 4x² + 12) + (- 8x⁴ + 3x³ + 4x² + x) = - x⁴ + x + 12question 16: (3x² - 2xy + 9y²) + (x² - 5xy - 6y²) = 3x² + x² - 2xy - 5xy + 9y² - 6y²property of combining and adding the like terms; (3x² - 2xy + 9y²) + (x² - 5xy - 6y²) = 4x² - 7xy + 3y²rewriting the equation in descending order; (3x² - 2xy + 9y²) + (x² - 5xy - 6y²) = 4x²  + 3y²  - 7xyquestion 17: (- 12x² + xy + 2y² ) + ( - 4x² + 9xy - 2y²) = - 12x²- 4x² + xy + 9xy + 2y² - 2y²property of combining and adding the like terms; (- 12x² + xy + 2y² ) + ( - 4x² + 9xy - 2y²) = - 16x² + 10xy + 0eliminating the zero; (- 12x² + xy + 2y² ) + ( - 4x² + 9xy - 2y²) = - 16x² + 10xyquestion 18: (8x²y + 3xy² ) + (6x²y -11xy²) = 8x²y + 6x²y + 3xy² - 11xy²property of combining and adding the like terms; (8x²y + 3xy² ) + (6x²y -11xy²) = 14x²y - 8xy²