The lifespans of lizards in a particular zoo are normally distributed . The average lizards lives 3.1 years ; the tandard deviation is 0.6 years Use the empirical rule years . (68-95-99.7\%) to estimate the probability of a tiger living between 2.5 and 4.3 years

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.