Answer:
3
Step-by-step explanation:
Fill in the numbers and do the arithmetic:
3+11t -9u = 3 + 11(9) -9(11) = 3
_____
Your understanding of the commutative property of multiplication lets you observe that 11·9 = 9·11. You also know that adding opposites results in zero, so 11·9 - 9·11 = 0
Of course, 3 + 0 = 3.
In other words, you don't actually have to work it out as ...
3 + 11(9) -9(11)
= 3 + 99 - 99
= 102 -99
= 3
