Which of the following is x⁴ + y⁴ identically equal to?
(a) (x² + y²)(x + y)(x - y)
(b) (x² + xy + y²)(x² - xy + y²)
(c) (x² + √2xy + y²)(x² - √2xy + y²)
(d) (x² + √3xy + y²)(x² - √3xy + y²)
(e) (x + y)²(x-y)²
can someone explain me how to make it step by step?

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

8

step-by-step explanation: