Acontractor uses the expression 7(x+3) to find the length, in feet, of chain that he needs for a certain project. part a the contractor needs four chains that are the length. what is the total length of all the chairs? show work because i really don't understand.

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.

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class