5 - 6i11
5 -6 i
11
-1
5 + 6 i

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?

Ef is a median of trapezoid abcd. the length of ab is 12, and the length of cd is 18. the length of bf is 4. what is the length of fc?

You are given the first four terms of an arithmetic sequence. which one is best to use, recursive formula or explicit formula? why? pleasseee ! : (