Can someone graph this please
I need this fast​

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

The excretory system,need answers for all: )

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2