Help me please and thanks

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.

Acircle has a circumference of 28.36 units what is the diameter of the circle

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?