1.)An operation * is defined on the set R, of real numbers by m*n= -n÷m²+1
where m, n are real numbers. If -3, -10 are real numbers, show
whether or not * is commutative.

b) Given that x*y=2x-y, where x
and y are real numbers, find the value of
i) 5* (4*5)
ii) y if y*(3*)=6.​

are these the benchmarks questions?

d. a week

hope this

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.

i would have to say i believe that it is a.