its 60-10+x why, because she bought the dress with $60 and she received $10 dollars back. We don't know the variable.
48/40 = 1 8/40
1 8/40 Simplify to 1 1/5
Hope this helps!
bc the length of the hypotenuse is the sum of the other two legs. thats why the equation is: a^2(hypotenuse) = b^2 + c^2 (the other two legs)