Do the side lengths 5 inches, 7inches, and 9 inches in form of a right triangle

use pythagorean theorem

a^2 +b^2 = c^2 to check

5^2 +7^2 =9^2

25 +49 = 81

74 does not = 81  so it is not a right triangle

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

the function makes a strait line horizontally with no x intercept but a y intercept at 9.