Page 86 3: h = s * 2/a =176 * 2/22 = 352/22 =16 (m) Page 86 4: s = ah/2 = 9.5 *16/2 = 76.

Page 86 5:: s = ah/2 =12.5 * 7.8/2 = 97.5/2 = 48.75 (dm2) = 0.4875 (m2) 0.4875 * 68 = 33.15 (yuan).

I turned over the book myself, so be sure to give it to me. I am original. Look at the time.