A) No it is not reasonable because if you’re estimating the cost as
$100 (per keyboard) x 4 (that he needs to buy) = $400
4 x $105 = $420
Or
(3 + 1)$105 = $420
The answer is 0
The formula is
n!/ r!(n-r)!
4!/ 9!(4-9)!
N^2-3n-4=0
(n-4)(n+1)
-4+1=-3
-4*1=-4
n-4=0
n=4
n+1=0
n=-1
Final answers: x=-1, x=4
Answer:
i really dont know
Step-by-step explanation:
but let me ask my bro
ty <3