( please help ) Before your trip to the mountains, your gas tank was 7/9 full. When you returned home, the gas gauge registered 1/3 of a tank. if your gas tank holds 18 gallons, how many gallons did you use to drive to the mountains and back home?

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

X+y=-4 x-y=2 use elimination with adding and subtraction