Which equation is an example of the use of the associative property of addition ?

1) x+7=7+x
2)3(x+y)=3x+3y
3)(x+y) +3 =x+(y+3)
4)3+(x+y)=(x+y)+3

Asoccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet

Which of the following circles have their centers in the third quadrant?