jennifer is traveling with her family to her grandfather's house. They have driven 435.6 miles during the last 7 hours and only have 21.56 miles left. How many miles is the trip to her grandmothers house?
To find the total distance of the trip to Jennifer's grandfather's house, we need to add the distance driven so far during the last 7 hours (435.6 miles) to the remaining distance (21.56 miles).
Thus, the total distance of the trip to Jennifer's grandfather's house is 435.6 + 21.56 = <<435.6+21.56=457.16>>457.16 miles. Answer: \boxed{457.16}.