2. Which continent is estimated to have more than 5.31 billion people by 2050? To solve, find what percent 5.31 billion is of 9 billion. Write a ratio of part to whole. ? 100= 5.31 9Solve for ?. Change your answer for ? 100to a decimal and then to a percent. %

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.