What number is represented by 2.55 x 10-4?

255

2,550

0.255

0.000255

Answer of the given question is 
2.55*10-4
=25.5-4
=21.5

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.