Answer:
[tex]34449[/tex]
Step-by-step explanation:
[tex]a_{1} =7\\r=-3[/tex]
[tex]a_{1} = 7\\a_{2} = -21\\a_{3} = 63\\a_{4} = -189\\a_{5} = 567\\a_{6} = -1701\\a_{7} = 5103\\a_{8} = -15310\\a_{9} = 45930[/tex]
[tex]7+(-21)+63+(-189)+567+(-1701)+5103+(-15310)+45930[/tex]
[tex]=34449[/tex]
