The population of the planet magrathea doubles every 40 years. in the year zero the population was 20 million. the total land area of magrathea is 200 million square kilometers. one square kilometer of land can house 200 magratheans. land that is not used for housing is used for agriculture. write down an equation whose solution is the year in which there are 30 m2 of agricultural land available for each inhabitant. solve this equation.

(energy)

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

Bones,muscles, cartilage, tendons,  ligaments, joints, and other connective tissue.