Answer:
49x^4-42x^2 y+9y^2
Step-by-step explanation:

square root it and divide by pi. square root of 529 is 23. then divided by pi (3.14) is 7.32.
Answer:
Avery's mistake was adding the fractions together, she should've multiplied them together to get 3/8 square yards.
To grandparents house :
140/56 = 2.5 hours
Return trip :
140/50 = 2.8 hours
Total time : 2.8+2.5 = 5.3 hours