Determine whether a relation r on the set of all people is reflexive, symmetric, antisymmetric, and/or transitive, for the following 4 different r's : a) a, b∈r iff a is taller than b b) a, b∈r iff a and b were born on the same day c) a, b∈r iff a has the same first name as b d) a, b∈r iff a and b have a common grandparent

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Math it's appreciated. (picture provided)

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities