A man drove a total round trip distance of 646.25 miles. His car used 12 gallons of gas in one direction and 11.5 on the return trip. What was his average mileage for the entire trip? I don't get what to do :( someone help please!​

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Someone me what is the area of this figure? 18m 18m 8m 16m