Ohk sove this first
Multiple correct​

k=3(n+1)(n+2)

Step-by-step explanation:

Given P(Ei)=in and let P(Ei)=ki(i+1)

so

∑i=1nP(Ei)=k∑i=1ni(i+1)=k[n(n+1)(2n+1)6+n(n+1)2]

so

1=kn(n+1)2[2n+13+1]=k3⋅(n+1)(n+2)

so k=3(n+1)(n+2)

0.5 meters per second

step-by-step explanation:

the average speed between 2 seconds and 8 seconds is 0.5 meters per second.

hope this ! mark brainliest!