Question

to find 19 + (11 + 37), lennie added 19 and 11. then he added 37 to the sum. What property did he use?

Answer 1

i don't understand what are you talking about because in math the numbers into the brackets must be resolved first of all and later the numbers out of the brackets

19 + (11 + 37)
19 + (48)
19 + 48
67