Answer:
Following are the responses to the given question:
Step-by-step explanation:

In any linear equation the coefficient of the x-term represents ALWAYS the slope.
So it is B. The slope of the line
If EG=67 we have (3x+7)+(5x-4)=67
let's simplify

now we know x is 8 we can use this to find EF
since EF=3x+7

so we have EF is 31!
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Answer:
The surface area is 339.5 
Step-by-step explanation:
The surface area of a 3-dimensional shape is calculated by adding the areas of each side together, which would be 24.5 + 52.5 + 52.5 + 105 + 105 = 339.5 inches squared.