Ivan used 3 1/6 gallons of gas on Saturday and 1 4/5 gallons of gas on Sunday. How many gallons of gas did he use on the two days combined

Areflection of shape i across the y-axis, followed by a , and then a translation left 6 units and down 4 units confirms congruence between shape i and shape ii. alternatively, a of shape ii about the origin, followed by a reflection across the y-axis, and then a translation right 4 units and up 6 units confirms congruence between shape ii and shape i.