PLZ HELP I WILL GIVE YOU 30 POINTS You are designing an experiment to test the efficiency of different bikes. What simple machines helped to make this complex machine?

wedge, pulley, and wheel and axle

wedge, screw and wheel and axle, inclined plane

screw, inclined plane and wheel and axle, pulley

screw, lever, and wheel and axle

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

During which time interval does the object travel approximately 10 meters

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.