Find the value of `.^80C_2` = ....

If 70**10 = -7, 50**5 = -10 and 10**5 = -2, " then find the value of " 80**1 = ?

Find the value of x, if 80:60 = x:12.

find the value of   7_(C_2)

A polystyrne having formula Br_(3)C_(6)H_(3)(C_(3)H_(8))_(n) found to contain 10.46% of bromine by weight. Find the value of n. (At. wt. Br = 80)

Find the value of : -5+(-6)+(-80) .