+65 The elevation of city A is 60 feet above sea level; the elevation of city C is 12 feet above sea level. The elevation of city D is of the elevation of city C.
Part A: Write an expression to represent the elevation, in feet, of city D.
Part B: Solve the expression and explain why the answer is negative or positive.
+2666 Part A: \({1\over2}\times{12}=\color{brown}\boxed{6}\)
Part B: \(\color{brown}\boxed{\text{positive}}\)
+2666 Parity Rules:
pos x pos = pos
pos x neg = neg
neg x pos = neg
neg x neg = pos
Both \(1\over2\) and \(12\) are positive, so the product must be \(\color{brown}\boxed{\text {positive}}\)
