How is doing operations, adding, subtracting, multiplying and dividing with rational expressions similar to or different from doing operations with fractions? When would this be used in real life?

Doing operations with rational expressions is essentially the same as doing operations with fractions, as rational expressions are simply fractions with variables in the numerator and/or denominator. When adding or subtracting rational expressions, the first step is to find a common denominator, just as with fractions. When multiplying or dividing rational expressions, you simply multiply or divide the numerators and denominators separately, just as with fractions. This concept is used frequently in real life, particularly in fields such as engineering, physics, and finance, where calculations involving variables are common. For example, when designing a bridge or building, engineers must use rational expressions to calculate loads and stresses on various components. In finance, rational expressions are used in calculations involving interest rates on loans and investments.