Answer:
I think its the assosiative property, i'm not positive tho.
Step-by-step explanation:
The formula for the area of a triangle is area=

. So when you plug in the given values: Area=

. When you convert all the numbers to fractions: Area=

. You multiply across the numerators and divide by the product of the denominators and get 137.25

.
I did it wrong I was thinking to complex.
What you need to do is add 5/8+3/10 ( I turned them into Decimals)
So .625 + .3 which equals .925 miles walked or if you need to put it into a fraction 9.25/10
Sorry for the wrong answer the first time.
No you can’t add them, but you can do this: 7x+7 =0
-7 -7
7=7x
/7 /7
1=x