Find an ordered pair to represent t in the equation t=1/2u-v if u=(-1,4) and v=(3,-2)

Find the sum of the following series. round to the nearest hundredth if necessary.

Agrain trader buys the following amounts from three suppliers: 3,200 pounds, 5,100 pounds and 700 pounds. what is the total weight of his purchase?

Which is the graph of the piecewise function f(x)? f(x)=[tex]f(x) = \left \{ {{-x+1, x\leq 0 } \atop {x+1, x\ \textgreater \ 0}} \right.[/tex]