Tony wants to model the associative property of addition using a number sentence. which number sentence could be used for tonys model?
a. 6+(4+5)=6+(5+4)
b. 8+7=8+7+0
c. 7+(3+6)=(7+3)+6
d. 8+7=9+6

How do you use the elimination method for this question? explain, because i really want to understand!

17 in long 1.3 ft wide and 8in high what is the volume

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%