Pyramid height 9 cube sides 15

Which number can each term of the equation be multiplied by to eliminate the decimals before solving? 5.6j- 0.12=4+1.1j

Which has the greater energy, light of wavelength 519 nm or light with a frequency of 5.42 x 10^8 sec^-1?

Aa at 9 a.m. it at 4 p.m. he a of $28.84.?