In the diagram below, BC is an altitude of AABD. To the nearest whole unit, what is the length of CD?
B
30
A
O
16ο
Α. 52
Β. 58
C, 44
D. 56

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

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

Will mark brainliest! ( explain the answer too, it can be one sentence)