Please answer both questions and provide full solutions for logs. This is pre-calculus and advanced functions.

Welders use a logarithmic scale to identify protective eyewear. The shade number n, is given by the equation n = 1 Wig , where T is the fraction of visible light that glass transmits. [5T] a. What shade number should a welder use that only transmits '/s of the light entering the glass? b. Viewing a solar eclipse through #14 welding glasses is considered safe. What fraction of light do these glasses transmit. A. The intensity, I of light in lumens, passing through the glass of a pair of sunglasses is given by the equation 1(x) = 10(0.8)x , where x is the thickness of the glass in millimetres and 10 is the intensity of light entering the glasses. How thick should the glass be so that it will block 25% of the light entering the sunglasses? [5A]