exam Maths Puzzle Numerical Ability

I would like to know if i did this problem correct. this problem is from a work sheet.
y=2x and y=2-1
_2=2(-1) and -2=-1-1

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2/3+1/4t=1/3 a civia civiq group is building a sandbox that is enclosed by 1-foot wide railroad ties. The group needs to find the area inside the sandbox to find the amount of sand needed. Writ