Difference between commutative and symmetrical property; as they both share the feature 'a+b = b+a'

Arectangular courtyard is 12 feet long and 8 feet wide. a tile is 2 feet long and 2 feet wide. how many tiles are needed to cover the courtyard?

Iknow the square root of 2 is irrational

Which law states that if a conditional is true and its hypothesis is true, then the conclusion is true? a. the law of syllogism c. the law of detachment b. the law of conditional d. the law of deductive reasoning