You have to do what it says if you have to divide you divide if you have to multiply you multiply if you have to add you add and that is the same for subtraction as well.
I hope this helps you out.
Step-by-step explanation:
Answer:
C
Step-by-step explanation:

Actually Welcome to the Concept of the Differential Calculus.
Since, we know this is a definite calculus,
thus we get here as, by using the Chain Rule.
Answer:
r = t - u - s
Step-by-step explanation:
To solve for r in terms of s, t, and u, means to have r on one side and have t, u, and s.
t = u - s + r
t - u = s + r
t - u - s = r