1) Negative five
-5 x 4 = -20
2) Negative eighty
-80 / -4 = 20
3) Negative 1/5
(-1/5) x (-20) = 4
4) Negative eighty
(-80) / 4 = -20
Ok, let's use N and N'.
N is (-1,-1). N' is (4,6).
From point N, the quadrilateral moves to the right 5 and up 7.
So, N+(5,7)=N'.

Katrina has read 85% of her book.
Answer: $14.31
Step-by-step explanation:
Assuming it is the final price Natalie paid that you want:
Selling price = 0.9 * 15
= $13.50
To cater for tax it was then multiplied by 1.06:
= 13.5 * 1.06
= $14.31
You can use liters, cups, etc i would suggest kiters