Complete.
5. m26 + m2 7 + m2 8 = ?
6. if m 26 = 52 and m2 11 = 82, then m27 - -
7. if m 26 = 55 and m 2 10 = 150, then m 28 - -
8. if m 26 = x, m2 7 = x - 20, and
m211 = 80, then x = _?
9. if m 2 8 = 4x, m 2 7 = 30, and
m 29 = 6x - 20, then x = ?
10. m 2 9 + m2 10 + m2 11 = 2.
exs. 5-10