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Step-by-step explanation:

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Step-by-step explanation:

you have to find the area of each side

for the two triangles(front and back sides) A=BH/2 so 45 but since there are two triangles you multiple by 2 so 90

For two rectangular sides(the ones on the sides) A=LW so 144.2 but there are two so 288.4

For the bottom rectangle A=LW so 140

Then add them together

90+288.4+140= 518.4