Simplfy the following expression by dividing

We just started the introduction into circles and i have no idea how to do this.

Aline passes through 3,7 and 6,9 what equation represents the line

Amanufacturer knows that their items have a normally distributed lifespan, with a mean if 9.1 years, and standard deviation of 2.9 years. if you randomly purchase one item, what is the probability it will last longer than 10 years?