What is the value of the expression 1, dot, 2, plus, 3, to the power 4

The value of the expression 1.2 + 3^4 is 1.2 + 81 = 82.2.

To evaluate the expression 1.2 + 3^4, you need to follow the order of operations, also known as PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction):

Step 1: Calculate the exponent.
3^4 = 3 * 3 * 3 * 3 = 81.

Step 2: Add the number before the decimal point to the result from Step 1.
1.2 + 81 = 82.2.

Therefore, the value of the expression 1.2 + 3^4 is 82.2.