$\"\"$ $\"\"$

The expression is k².

Base is k and the exponent is 2. $\"\"$

k² means "k to the second power" or "k to the power 2" or "k squared"

$\"\"$

Substitute k = 2.5 in the expression.

$\"\"$

$\"\"$ . (Multiply: $\"\"$ ) $\"\"$

Base is k and the exponent is 2.

Value of the expression is $\"\"$ .