2(-6+-3)to the power of 2 - (-6+-4)

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

With alll of except for the 2 that i did already

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625