Solve this riddle

i have three different digits none are 0 if you reverse the order of my digits my value stays the same i have a decimal point

which number is the greatest number you can write with these rules?

An assembly consists of two mechanical components. suppose that the probabilities that the first and second components meet specifications are 0.87 and 0.84. assume that the components are independent. determine the probability mass function of the number of components in the assembly that meet specifications. x

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective