WORTH EXTRA POINTS! Pythagrem theroem 7th grade math EASY. Will mark brainliest

A. x=√60

Step-by-step explanation:

Divide 4 in half because you are solving half of an isosceles triangle

You formula is x²+2²=8²

Square root what you can: x²+4=64

Isolate the variable: x²=60

Square root both sides, x=√60

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