book Maths Puzzle Numerical Ability

Juliet runs out of gas in Barnhaven, South Carolina. She walks 9 mi west and then 5 mi south looking for a gas station. How far is she from her starting point? Round to the nearest tenth.

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please help me solve this equation..... 16.5d-(d+3)=(d+2)+7
20.6(x+2)=4-(3-2x)=1 24.2(x+1)+15x=-(3x-17)+5x 28.8y-3(4-2y)=6(y+1)-2 32.-4(2x-5)+3x=x-28 36.-4(2x-5)+3x=x+x-28 40. 7-24-3x+8x=-(x+31) (a-x):(b-x)be the duplicte ratio of (a2:b2).Show that 1/a + 1/b = 1/x