Question

pls answer fast!!!!!!!!
Q-4,6,7 and 13

Answer 1

It is in the formx^3+1/x^3+3x+3/x
=(x+1/x)^3=(x+1/x) *(x+1/x) *(x+1/x)

Answer 2

4. distance=14km = 14000m
    time=8minutes=480 sec
    
     speed=d/t
                =14000/480
               =29.16m/s (approx)

6. speed 12km/h=12000/3600=3.33m/s (approx)
     time=36minutes=36*60=720sec


     distance=speed/time=3.3*720=2376m

13. total distance= 2500+1200+500=4200000m

     total speed=500+400+250=718.7m/s
     average speed=5843m/s (aprrox)