Which equation shows an example of the associative property of addition?

(4+1) + 41 = 4+ (i + 41)
(4+1) + 4i = 41+ (-41 +1)
41-(-4i + ) = (41 - 41) + (411)
(-41 + 1) + 0 = (-41 +1)

That is so true, i can’t believe how true this is

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.