3 or the whole backyard
Step-by-step explanation: In a hour she can rack 3 backyard. The question asked that how much of a backyard can she rake in 1 hour. She can rake the whole backyard in a hour.
c. side angle side. u shares the same sides
1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2
i am only able to answer the first part. i am not sure about the second part. sorry