Question

\\\frac{1}{2}(21+2^2)\\

Explanation:

Evaluate the exponent inside the parentheses

$$ 2^2 = 4 $$

Simplify the expression inside the parentheses

$$ 21 + 4 = 25 $$

Multiply by the fraction

$$ \frac{1}{2}(25) = \frac{25}{2} = 12.5 $$

Answer:

\(\frac{25}{2}\)