Final answer:
The question appears to ask about the longevity of glass use, likely an exponential decay problem, but the provided information doesn't include a specific decay rate for glass. We would need the decay rate to calculate the time it would take for only 9% of the original amount of glass to remain in use, using the exponential decay formula.
Step-by-step explanation:
The question seems to be inquiring about the decay or usage rate of a certain material, possibly glass, over time. However, the information provided does not directly answer the question about when only 9% of the original amount of glass will be in use. The references to market shares for windshields, environment-related statistics, and Co (Cobalt) decay could all be part of a larger problem or discussion but they don't give us a direct decay rate or formula that we can use to calculate when only 9% will remain.
Nonetheless, if we had a decay rate or a certain percentage of glass no longer being used each year, we could apply the concept of exponential decay. In such a case, we would use the formula N(t) = N0 * e^(-λt), where N(t) is the quantity that still remains after time t, N0 is the original quantity, λ is the decay constant, and e is the base of the natural logarithm. Solving this equation for the time t when N(t) is 9% of N0 would provide the answer.