Which value of x makes the equation true?
(look at picture for question)

x=-9=(b)

Step-by-step explanation:

3x-6/3=7x-3/6

=>3x-6=7x-3/2

=>2(3x-6)=7x-3

=>6x-12=7x-3

==>-12+3=7x-6x

===>-9=x

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

answer is x<