Final answer:
The solution involves combining like terms and isolating the variable p to find that p equals 3.
Step-by-step explanation:
The student's question involves solving a simple algebraic equation for the variable p.
The equation given is p − 4 + (−9) = −10.
To solve for p, we need to combine like terms and isolate p on one side of the equation.
Combining the numbers on the left gives us p − 13 (since −4 + (−9) equals −13).
Adding 13 to both sides of the equation to solve for p gives us p = −10 + 13, which simplifies to p = 3.
Therefore, p equals 3.