What property of addition is illustrated in the equation below? (3x + 2) + 16 = 3x + (2 + 16)

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?