Answer:
x∈{-7√2, 7√2}
Step-by-step explanation:

Yes cause he can decrease the perimeter in any way and it would change the area and idk the other 2 in the front
The commutative property of addition means we can add two integers in any order. So yes, It would still apply to two negative integers (for example, -2 + -3 and -3 + -2 both equal five)
D , the answer is "six less than a number b"
Answer:
12.53 miles
Step-by-step explanation:
6² + 11² = x²
36 + 121 = x²
157 = x²
x = 12.53 miles