D= 65 degrees.
Because straight line adds up to 180
So 180-115= 65
Answer: Perpendicular because the second line has a 2/3 slope and starts at 4.
Answer:

Step-by-step explanation:
The given functions are:

and

We want to to find

Note that:

We substitute the functions to obtain:

We now substitute x=7, to get:

This implies that


Answer:
18 ducks
Step-by-step explanation:
add the parts of the ratio 7 + 6 = 13
divide the total by 13 to find one part of the ratio
= 3 ← 1 part of the ratio
7 parts = 7 × 3 = 21 ← number of swans
6 parts = 6 × 3 = 18 ← number of ducks
By proportion that would be 15/25 * 4 = 2.4 days