When adding exponents with different bases and exponents, the bases cannot be combined, and the exponents cannot be combined.

When adding exponents with the same base and exponent, you can combine the exponents by adding them together.

When adding fractional exponents with different bases and exponents, the bases and exponents cannot be combined. The final answer is the sum of each term with the base and exponent as it is.

When adding fractional exponents with the same base and exponent, you can combine the exponents by adding them together.

When adding variables with different exponents, the variables must have the same base in order for the exponents to be combined. If the bases are different, the exponents cannot be combined and the final answer is the sum or difference of each individual term with the variable and exponent as it is.

When adding variables with the same exponent, you can combine the variables by adding them together.