1. simplify: 4.6x^2+3.2x-4x+2.7x^2-x 2. 1/4(24a+28) 3. what is the sum: 5/3+[-2/8 ] 4. order from least to greatest: √5 ,-0.1 ,[-5/3 ],0.7 ,√2 5. name the property: a) 5+(2+3)=5+(2+3) b) 4(2/5)=(2/5)4

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