Question

1. c + 12 = 15

Explanation:

Step1: Isolate the variable

To solve for \( c \) in the equation \( c + 12 = 15 \), we need to isolate \( c \). We can do this by subtracting 12 from both sides of the equation. This is based on the subtraction property of equality, which states that if we subtract the same number from both sides of an equation, the equation remains true.

$$ c + 12 - 12 = 15 - 12 $$

Step2: Simplify both sides

Simplifying the left side, \( c + 12 - 12 \) simplifies to \( c \). Simplifying the right side, \( 15 - 12 = 3 \). So we have:

$$ c = 3 $$

Answer:

\( c = 3 \)