I'm thinking, few people use math beyond introductry algebra in their life work, and often there are other ways?

Well...

Of course there are great minds who "can't grasp" advanced math. There are great minds who "can't grasp" poetry. There are highly educated people who can barely hold a conversation with the person behind the counter at Dunkin Donuts.

As far as how many people use math beyond algebra in their work life... If you work behind the counter at Dunkin Donuts, yeah. However, if you work in almost any manufacturing environment, you are very likely to use statistics or, at least, be able to understand and react appropriately to statistical measurements. If you deal with drawings, trig and geometry are important. Graphical representation of data is certainly a very important skill with enormous variety of applications but, if you are dealing with things more complicated than donuts, advanced math is involved in generating those graphs. You need to recognize that computers are really really stupid, garbage in, garbage out. So... if you don't understand what the computer program is doing, you won't have a clue whether the "answer" is right or wrong. Mathematic models are very important in all sorts of applications and there can be a whole lot of advanced math. And... "trial and error" is very expensive. Do your really want to buy a car or a TV or a cell phone or a computer or fly in an airplane or be x-rayed by your dentist with equipment that was designed by "trial and error"?

Those who are most dangerous are those who don't know that they don't know. If you think our modern world can continue to operate and progress using only handbooks and tables and trial and error, then you seriously lack an understanding of what surrounds you every day.

How do you do! What level do you have acheaved yet? Thede a few men once will grasp almost all your buisness due to it include hiigh tech devices that are own by them. Accelerometre can't be build without first rate equation just as modern rockets for any dynamics aims that demands second rate diff equations. And so to save himself from them as well being invisible. That is only second derivative to do. By your PC you can just now give information in ANY point on Earth about aims as well. Anu document is relation one to another as psihology too. Trust me it is very powerfull method for defence since deal with information. Single strenth of flock is its big size vasting like internet.

I'm assuming you are having trouble in math. Well, you can always be an animator or a musician or a therapist, or a writer, or a firefighter.

With math: you can be a chemist, physicist, engineer, or a business person.

Then, there's subgroups, like organic chemists, inorganic chemists, pharmaceutical chemists, analytical chemists.

Even when people predict the weather like it will be cloudy with a lot of rain and a windchill of -28 degrees Fahrenheit, and thunderstorms......somebody predicted that.....probably using calculus.