. For example, to become a mechanical engineer you need a bachelor's or master's degree. All STEM students must learn calculus, and depending on the primary students, they may need to learn more mathematics. For example, all engineers must learn differential equations and linear algebra. According to bls.com, there are 258,100 mechanical engineers today, but the industry is only expected to grow 10%. There will be 11,600 new jobs for mechanical engineers from 2012 to 2022. Mechanical engineers design and produce transportation equipment, machinery manufacturing, vehicle systems (such as hybrid-electric cars), clean diesel vehicles, energy projects alternative, regeneration and nanotechnologies. Mechanical engineers are expected to experience faster than average growth in oil and gas extraction if they gain thermal energy knowledge and skills. Mechanical engineers typically earn $80,580 per year. Salaries range between $52,030 and $121,530. In conclusion, there are many people who love to build, design things but are insecure about their mathematical abilities, and still became successful mechanics.