Simplify the expression that you wrote in part D, and explain what the number means with regard to the problem.

When two negatives are put together, it makes a positive. Something subtracted by a negative number, will then have that negative number added to it.

Step-by-step explanation:  hope it helps! i know its late but other people can use the answer. <3

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

congruent segments

step-by-step explanation: