Find the length pf PQ if P is between Q and R, PQ = 2y, QR = 3y + 1, and PR = 21

Can someone list any possible solutions to air pollution ?

Reading graphs: unemployment us unemployment rate (1961-2011) identify the trends in the graph and then use the drop- down menu to complete each statement from 1961 to 1965 unemployment was in the mid-2000s through 2011. unemployment was percentage unemployed 1961 1971 1981 1991 2001 2011 year

The middle east links which two continents? ●asia and europe●europ and africa●africa and asia●africa and australia