What is a compound formed when 2 or more elements are combined in a set

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

He viscosities of several liquids are being compared. all the liquids are poured down a slope with equal path lengths. the liquid with the highest viscosity will

(1 point) match the differential equations and their vector valued function solutions. you may wish to multiply at least one solution out fully, to make sure that you know how to do it. you can get the other answers quickly by process of elimination and just multiply out one row element.