10 feet. You can prove this by dividing 8 by 2, with this you find that 1 inch on the blueprint is equal to 4 feet. then take half of 4(2), and add it to 8 to get your answer.
It is the first equation. The 35 dollars she has left, plus the 6 dollars she spent on socks, plus the shoes (X) equal 75. The equation is x+6+32=75 Hope this helps