Answer:
a)

b) Dy=1.2
c) See attachment
Step-by-step explanation:
a)Let

be a small change in x, then the corresponding change in y is

We have

This implies that:

We substitute

This gives

b) Let


This implies that:

with dx=0.6 , and x=1,


Answer:


Step-by-step explanation:
Answer:
$270
Step-by-step explanation:
Price after markup was 1.20($250) = $300
Price after discounting: (1.00 - 0.10)($300) = $270
Simple proportions.
You want a 1:5 ratio.
You have a 5:1 ratio.
So you add another 24 drops of white.
5:25 = 1:5
or
5/x = 1/5 and cross multiply.