4 square miles of land is separated into sections that each an area of 1/2 square mile. How many sections are there?

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

Simplify the expression. -2/5(10+15m-20n)

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.