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Submit Answer 7. [-/1 Points] DETAILS TANAPMATH7 11.5.051. MY NOTES PRACTICE ANOTHER Cell Phone Ad Spending A certain industry's ad spending between 2005 (t = 1) and 2011 (t = 7) is projected to be S(t) = 0.89t0.98 ( 15t s 7 ) where S(t) is measured in billions of dollars and t is measured in years. What is the projected average spending per year on these ads between 2005 and 2011? (Round your answer to two decimal places.) billion/yr Need Help? Read It Submit