Choose three number from 1 to 6. write the numbers in an addition sentence. show two ways to find the sum

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

A(1,1) b(-3,0) c(-4,-1) d(3,-2) drag it to correct position