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Yes, you can pour new concrete over old concrete, but you need to apply a concrete bonding agent to the existing concrete to ensure the new concrete sticks. Keep in mind that even with a bonding agent, large cracks and other flaws will still come through. If the concrete has heaved, settled, or cracked, pouring new concrete on top won’t address any root structural problems. Removing the existing concrete and rebuilding will be your best solution in that case.

The method used to repair cracks in your concrete driveway will depend on the extent of the damage, but the most common method for small cracks is to use a driveway resurfacing compound. This solution is either cementitious or made of polyurethane, and it will seal the crack and make your driveway appear undamaged. 

For more severe cracks, you will likely need to hire a professional driveway repair service. They can use mudjacking, epoxy injections, partial driveway replacements, or a combination of these to fix more serious cracks in your concrete driveway and to prevent recurring issues.

The number of concrete bags you'll need depends on the width and length of your fence post hole. A 50-pound bag makes about 0.375 cubic feet of concrete. So, if your hole is 30 inches deep and 12 inches wide, you'll probably need around five 50-pound bags for each post.

If it's well maintained, a polished concrete floor can add value to your home. Concrete is a low-maintenance and durable material that can appeal to homebuyers, especially if they prefer industrial and modern designs. Naturally, higher quality floors will add more value.