Could somebody help me with these please

1- A pilot glided over a tower, located in a direct line with the runway, with 30 m to spare and touched down on the runway at a point 6500 m from the base from the tower, how high is the tower?

2- Using these formulas :

V= IR

R= (pL)/A

A= 3.14

find the difference in current (I) that a copper wire (p=1.27* * m) can carry over an aluminum wire (p= 2.7* * m) with equal diameters (d) of .5 cm and a length (L) of 10 000 m carrying 110 V .

is 10 to the power -8, couldn't type it right.

Thanks in advanced