Define a 3×3 matrix whose entries
are the first 9 positive integers.
Let s_k be the sum of the elements
across the kth row. Is there such a
matrix where s_1 : s_2 : s_3 = 1 : 2 : 3 ?
−−−−−−−−−−−−−−−−−−−−
What about n×n matrices whose
elements are the first n^2 positive
integers? Is there a matrix such
that s_1 : s_2 : s_3 : s_4 :.....: s_n = 1 : 2 : 3 :...: n?
Question : figure x for
(√(x−4)) > 6−x
my answer :
(1) x−4 > (6−x)^2
(x−5)(x−8) < 0
5<x<8
(2) x−4 ≥ 0
x ≥ 4
so I have for x ⇒ 5<x<8
what′s wrong with this answer, please help me
because if x=9 ⇒ (√(9−4)) > 6−9 , it′s true
Every day, for n days, you put either
$1, $2, or $3 into a saving account.
It is random as to how much you save
each day. What is the average amount
you will have saved in n days?
If f(x)=x^n , then the value of
f(1) + ((f^1 (1))/1) + ((f^2 (1))/(2!)) + ... + ((f^( n) (1))/(n!)) , where
f^( r) (x) denotes the rth order derivative of
f(x) with respect to x , is