(Functions and Relations) Answer getting brainliest! Please explain if possible!

Which multiplicative property is being illustrated below? (type commutative, associative, or identity) 5 × 2 × 4 = 2 × 5 × 4

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

Negative 5 1/12 + negative 4 1/4 + 6 3/4