Hello, please I bed urgent help with this math problem please

option C

Step-by-step explanation:

Option C

Step-by-step explanation:

Quadratic formula:

c = - b ± √ /

c = - ( 7 ) ± √( 7 )^2 - 4( 4 ) ( -5 ) / 2 ( 4 )

c= -7/ 8 + 1/8 √129 "or" c = -7/8 + -1/8√129

hope this helps....

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