Answer:
ddx(x−m)=−mx−m−1
That is, ddx(x−m)=−mx−m−1. where m is a positive integer.
Step-by-step explanation:

The parabola's line of symmetry is the x-axis.
Answer:
Read below
Step-by-step explanation:
a) 
b)
(The reason both numerator and denominator can both be negative is because the negative cancel each other out and still simplify to
)
Answer:
80
Step-by-step explanation: