Astudy looked at the effects various fertilizers had on corn
growth. during the study, one corn plant grew 180 mm in
6 days. how much did the plant grow per day?

30mm

Step-by-step explanation:

The question "How much did the plant grow per day?" is asking for the rate of the corn growth for one day, in the format height/day.

The rate given is over 6 days rather than 1 day:

180 mm in  6 days

The find the rate for one day, divide the height by the days.

180mm/6days = 30mm/1day

Therefore the plant grew 30mm per day.

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