Explain how does knowing 1 + 7 you find the sum for 7 +1

Explanation: For this, we take two different numbers.

Let the first number be and the second number be

We use the commutative property, which says that the sum will remain same in whatever way the numbers are written.

Mathematically,

From the question,

x = 1

y = 7

Putting this in the commutative property equation, we get:

Hence, the sum of both the umber will be same.

the answer is 62.8 cubic units