Randy buys gas at a store that charges $3 per gallon. sarah buys gas at a different store. the table shown here gives the cost when she buys 3, 4, and 5 gallons of gas.  is gas more expensive at randy’s store or sarah’s store?

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.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.