a. \(\dfrac{x}{x+4} =\dfrac{3}{6}\), \(x = 4\).
b. \(\dfrac{6}{12}=\dfrac{7}{14}=\dfrac{10}{x}\), \(x=20\).
c. \(\dfrac{10}{15} = \dfrac{12}{x}\), \(x=18\)
d. Remember that the mid-segment is \(\dfrac{1}{2}\) the length of the 3rd side.
1) 9 2) 7 3) 14 4) 23.5 5) 11 6) 2
e. \(\dfrac{7}{15}=\dfrac{3.5}{x}\) or 7.5