Set up multiplication/division of proportions to cancel out units that you don't want and to introduce units that you do want in your final solution...
2678cm(in/2.54cm)(ft/12in)=2678/30.48 ft≈87.86 ft (to nearest hundredth)
One cubic centimeter is 1 mL. 1000 cubic centimeters is 1 liter. 525 cm3 is .525 liters.
Please give more information
-2/3x is the slope. the full problem is y=-2/3x + 3
