the engine displacement of an automobile is the volume through which the piston moves from high to low position. if an engine has n cylinders, the displacement is d =pi*(bore/2)^2 • stroke • n, where the bore is the diameter of the cylinder and stroke is the length of the piston's travel.
1 if bore = r/2 and stroke = h, simplify the expression, d, in terms of r and h for 8 cylinders.
2 if the bore is 4 inches, the stroke is 3.4 inches, and the engine has four cylinders, what is the displacement? round your answer to the nearest tenth of a cubic inch.

If its non of them tell me..valerie took a day-trip. she drove from her house for a while and took a coffee break. after her coffee break, she continued driving. after  2  hours of driving after her coffee break, her distance from her house was  210  miles. her average speed during the whole trip was  60  miles per hour.valerie created the equation  y−210=60(x−2)  to represent this situation, where  xx  represents the time in hours from her coffee break and  yy  represents the distance in miles from her house.which graph correctly represents valerie's distance from her house after her coffee break?