book Maths Puzzle Numerical Ability

Three students are standing at different places on the playground. Sally is at the swings and Jimmy is 5 feet belowo her at the see-saw. kathy is 12 feet left of Jimmy at the jungle gym. How far is Kathy form Sally? (hint: draw a picture first.)

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book Other Question
x^3+x^2+ sqrt(x^2+3x)=6

I've tried to square both sides, I've tried setting the equation equal to 0, I've tried to factor out x^2+x, I'm just at a loss.

Thanks for your help! A cube has a surface area of 194.94 square inches. How many inches long is one of its edges?