Which of these expressions cannot be simplified by combining like terms?
5ab3+7−3a2b2+a3b−10, 5ab3+3a2b2+a3b−10, 5ab3+2b(3ab2)+a3b−10, or 5a3b3+3a2b2+a3b3−10ab

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.

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

Which of the following circles have their centers in the third quadrant?