For the expression 28-28z to have a negative value, what must be true about the value of z?

z is greater or equal than 1

Step-by-step explanation:

28-28z<=0

28<=28z

z>=1

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

don't know what that says sorry i can't you

step-by-step explanation:

idk what it says