Ralph is sixteen years older than his cousin ivan. in four years ralph will be twice as old as ivan. how old is ralph now?

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

Acontainer holds 0.7 liters of oil and vinegar. 3/4 of the mixture is vinegar. how many liters of oil are in the container? express your answer as both a fraction and a decimal.

Me : julio wears a blue shirt every 3 days. larry wears a blue shirt every 4 days. on april 11, both julio and larry wore a blue shirt. what is the next date that they will both wear a blue shirt?