Answer:
or
.
Step-by-step explanation:
We have been given that Nigel is planning his training schedule for a marathon over a 4-day period. He is uncertain how many miles he will run on two days. One expression for the total miles he will run is
.
The Commutative Property of Addition states that we can add numbers in any order. For example a and b be two numbers.
According to Commutative Property of Addition
.
Similarly, we can write an equivalent expression to our given expression as:

We can simplify our expression as:
.
Therefore, our required expression would be
or
.
The width would be 10ft and the length would be 16ft
when you multiply 10 by 2 and 16 by 2 you get 20 and 32 and when those are added it gets 52
Hope that helps
If you have any questions leave a comment
As determined by the graph, f(-9) = 9
20 less than (-20) a number (n) is more than (>) twice the same number (2n)
-20+n>2n
minus n both sides
-20>n
n<-20