Write the following sentence using mathematical symbols. Twice the difference of x and 7 is greater than the reciprocal of 10.

2(x-7) > 1/10

Step-by-step explanation:

The statement says, twice the difference of x and 7.  This implies that it wants the difference of x and 7, x - 7, and it wants twice that difference so:

2 ( x - 7 )

The statement continues that this twice the difference of x and 7 is greater than the reciprocal of 10.  The reciprocal of 10 is 0.1 or 1/10.

Hence, the statement should be written as such:

2 ( x - 7 ) > 1/10   OR    2 ( x - 7 ) > 0.1

Cheers.

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