You buy an item for $74.95, and the sales tax is 4.5%. You give the clerk four $20 bills. Figure the following amounts: -The amount of sales tax
-The total cost including tax
-The amount of change you should receive.

The green family is a family of six people. they have used 4,885.78 gallons of water so far this month. they cannot exceed 9,750.05 gallons per month during drought season. write an inequality to show how much water just one member of the family can use for the remainder of the month, assuming each family member uses the same amount of water every month.

What is the number 321,000,000 in scientific notation? also what is the number? ?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?