Answer:
156 587 340
Step-by-step explanation:
[tex]\mathrm{s_n = a_1\:\cdot\:\frac{1-r^n}{1-r} }\\\\\mathrm{s_{12} = 28\:\cdot\:\frac{1-(4)^{12}}{1-4} }\\\\\mathrm{s_{12} = 28\:\cdot\:\frac{1-16777216}{-3}}\\\\\mathrm{s_{12} = 28\:\cdot\:\frac{-16777215}{-3}}\\\\\mathrm{s_{12} = 28\:\cdot\:5592405}\\\\\mathrm{s_{12} = 156587340}[/tex]
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Verified answer
Answer:
156 587 340
Step-by-step explanation:
[tex]\mathrm{s_n = a_1\:\cdot\:\frac{1-r^n}{1-r} }\\\\\mathrm{s_{12} = 28\:\cdot\:\frac{1-(4)^{12}}{1-4} }\\\\\mathrm{s_{12} = 28\:\cdot\:\frac{1-16777216}{-3}}\\\\\mathrm{s_{12} = 28\:\cdot\:\frac{-16777215}{-3}}\\\\\mathrm{s_{12} = 28\:\cdot\:5592405}\\\\\mathrm{s_{12} = 156587340}[/tex]