If you have enough clientele, there's potential for it. It's a bit doubtful you'll find yourself a multi-millionaire from doing lawnmower engine repair, though.
Start with simple jobs like paper route, or grass cutting. If the child has skills like fixing computers, you can start him/her out fixing friends/neighbours computers for a small fee. Hope this helps.
You can either sell them for a relatively small amount of money or you can scrap them. Or, if you really like your rusty car, you can spend a bit of money on 'doing it up'. By this I mean giving it a paint job and taking real good care of it and fixing everything that needs fixing. It also depends on what car it is. If it is vinatge, 'do it up'. If it isn't, sell or scrap.
Price fixing is what happens with supply and demand. An advantage is a business makes money. If someone employed by that business has a family, that can be good. A disadvantage is prices are usually very high just because people want the product.
Only if he's very good at finding bikes with very simple faults to them.
A good rule of thumb is to use 5W-30 for newer engines and 10W-30 for older engines or engines that are driven in hot climates or for primarily highway driving. If the manual to your car is available, use the oil that is suggested.
no there are multiply differences
The United States Department of Interior has a lot of good information on fixing concrete walls. Home Adviser is also a very good place to get information from consultants on fixing concrete walls.
If I were you I would start out small and get someone good with money!!!!!!:)
If you don't know how to do it in the first place - then don't bother trying. Fixing a head gasket is far too complex for an amateur - go round some of your local garages and get a quote for fixing it. It could end up costing thousands of pounds/dollars! My advice is - if it turns out to be pricey, then just buy yourself a new car if possible - and not a French one! Something like a Toyota Avensis (which I have had 3 of - all of which got near 200,000 miles) or a Honda Accord are good value for money, and VERY reliable (the V-Tec petrol engines in the Accord are probably the most reliable engines known to man).
No, and it may be a good idea to donate, too. The money will go towards fixing the bridge.
Yes , there are many , as nitrogen fixing bacteria .
No, non detergent oils have not been used in any small engines for years. Use a good name brand SAE 30 or SAE 10w30 detergent synthetic oil in any air cooled engine depending on what the manufacture recommends.