How do you solve this scientific notation question?

factorise 1/10^2 out of both.

add 1/4.5 to 1/9.4 common denominator  4.5x9.4

multiply result by 1/10^2

find reciprocal of result

phew !

a displacement distance is size of displ

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.