It cant be converted into a mixed number because it has no whole.
Answer:
The area of the baseboard is 
Step-by-step explanation:
We have,
Length of the bed, l = 15 m
Width of the bed, b = 9/10 m
It is required to find the area of the baseboard. It is a shape of rectangle. The area of a rectangular shape is given by :

So, the area of the baseboard is 
positive numbers are to the right or up, negative numbers are to the left or down.
So this means 1 unit left and 7 units up.
The answer to the shortcut is 20m