He worked on the car for 4 hours. 35+7+7+7+7=63.
Answer:

Step-by-step explanation:
Squares 
Volume 
Generally the equation for Volume of box is mathematically given by




Since
Length of cardboard is


Therefore
Dimensions of the piece of cardboard is

the answer would be 7/8
Step-by-step explanation:
Answer:
22
Step-by-step explanation:
Sum of two integers is 15. One integer is -7 and suppose other integer is x. Then
x+(-7)=15
x=22