Question

evaluate $15 + x$ when $x = 1$.
$15 + x = 15 + \square$

Explanation:

Step1: Substitute x with 1

We know that \( x = 1 \), so we substitute \( x \) in the expression \( 15 + x \) with 1. So \( 15 + x = 15 + 1 \).

Step2: Calculate the result (though the first blank is just the substitution)

But for the blank in \( 15 + x = 15 + \square \), since \( x = 1 \), the value in the square is 1. Then if we calculate \( 15+1 = 16 \), but the first blank is for the substitution of \( x \).

Answer:

1 (for the blank in \( 15 + x = 15 + \square \)), and if we evaluate the whole expression, the result is 16. But based on the blank given, the answer for the blank is 1.