Final answer:
The statement about for loop update expressions is false, as more than just addition or subtraction operators can be used. It is also false that the resultant vector's angle can be found solely with the angles of two vectors; the magnitudes are required. The Pythagorean theorem can be used for vectors at right angles to calculate the resultant's length.
Step-by-step explanation:
In response to the first part of the question, the update expression of a for loop may make use of a variety of arithmetic and assignment operators, not just addition or subtraction. Therefore, statement a) is False. You can use operators such as multiplication (*), division (/), modulo (%), and even bitwise operators to change the loop variable in different ways.
Regarding the GRASP CHECK question, if only the angles of two vectors are known, it is False that the angle of their resultant addition vector can be found. The magnitudes of the vectors are also necessary to determine the resultant vector's angle.
Lastly, statement 36 is True. The Pythagorean theorem can indeed be used to calculate the length of the resultant vector when two vectors are at right angles to each other. This theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.