Yes it is. In order for something to be a function, no X values can be the same, which is the case here.
Answer:
npr= n! /(n-r) !
nCr= =(n r) = n! /r!(n-r)1
Step-by-step explanation:
Is that all the information ? I think they’re missing something
#7 is the easiest one.
a + bi = -9 + 4i
see the expression on either side matches up so..
a = -9 and b = 4
