147 cubic feet of cement are required.
87.5 cubic feet
two and a quarter inches is desired for driveway for most domestic vehicles
Concrete driveways are no less than 3.5 inches to 4.5 inches.
Multiply length times width. IF your driveway was 1 foot thick that would be the number of cubic feet of concrete. HOWEVER- it is only 4 inches thick. That is .33 ft (one third of a foot). So take your answer you got from multiplying LxW, and divide by 3. That will be the number of cubic feet of the driveway's volume.
Well, you make a sidewalk from concrete, not just cement. Concrete consists of cement, sand, gravel and water. You will need 5.5 cubic feet of concrete. A standard sidewalk grade of concrete would be 1 part cement, 2 parts sand, 3 parts gravel- so the sidewalk needs 0.91 cu ft of cement- about 87 pounds worth- plus sand and gravel. If you want to buy the premixed bags of concrete (like Sacrete), you will need about 17 of the 40 pounds bags. And you did not ask, but 3 inches is kind of skinny- I would go for at least a 4 inch thick sidewalk.
It depends on the size of the sections, but generally, no less than 4 inches.
If you made a sidewalk about 2.5' wide it would be about 13' long.
53 and 1/3 cubic feet, concrete is normally sold buy the cubic yard, this would be 1.975 cubic yards. Figure on 2.25 CU yards to be safe. You do not want to run short when pouring concrete.
387 cubic feet. This is because 43x18x0.5 (as six inches is 1/2 of a foot) =387.
886 inches
depends what your "ok" is just rip it up and buy some quickrete from home depot and redo it
Essentially, you need three and a third cubic yards of concrete to replace that quantity to those measurements - so if the cost of a cubic yard of concrete is 30, multiply it by 3.333 and you get 100