The problem asks to find the size of angle $p$. The angles $75^\circ$, $70^\circ$, and $p$ are angles on a straight line.

1. Problem Description

The problem asks to find the size of angle $p$. The angles $75^\circ$, $70^\circ$, and $p$ are angles on a straight line.

2. Solution Steps

Angles on a straight line add up to $180^\circ$. Therefore, we have the equation:

$75^\circ + 70^\circ + p = 180^\circ$.

$145^\circ + p = 180^\circ$.

$p = 180^\circ - 145^\circ$.

$p = 35^\circ$.

3. Final Answer

The size of angle $p$ is $35^\circ$.