Answer with Step-by-step explanation:
Let A is non-singular
We have to prove that 
is unique.
Suppose B and C are inverse of A such that
and AC=I
By using property 
Hence, the inverse of A is unique.
3x² + xy2 – 3xy-y? >> 3x² - xy - y
line 1: = (3x² + xy2)+(-3xy – y?)
ANS 3x² - xy - y 《Correct》
line 2: = x(3x + y2) - y(3x – y2)
ANS 3x² - xy +2y²
line 3: = (x-y) (3x +y?)
ANS 3x² - 2xy - y²
If it incorrect, I'm sorry.
<span>The charity needs at least 1001 entries to raise more than $25000.
Let n be the number of race entries, i be the income of the race, and c the cost of the race.
The money that the 5K brings in is given by
i = 25 * n + 5000
The cost is given by
c = n * 5
Now if the charity needs to raise more than 25000 then the income minus the cost must be greater than 25000.
25000 < i - c
subsituting for i and c
25000 < i - c = (25 * n + 5000 ) - (5 * n)
simplifying results in
25000 < 25*n - 5*n + 5000
25000 < 20*n + 5000
20000 < 20*n
1000 < n
The number of entries must be greater than 1000. Since entries must be an integer the charity needs at least 1001 entries.</span>
Answer:
(300,000 + 20,000 + 0 + 700 + 40 + 9)
Step-by-step explanation:
The expanded form of 320, 749
Segmenting each digit in the figure based on its place value :
3 = 100 thousand place = 3 * 100,000 = 300000
2 = ten thousand place = 2 * 10,000 = 20000
0 = thousand place = 0 * 1,000 = 0
7 = hundred place = 7 * 100 = 700
4 = tens place = 4 * 10 = 40
9 = unit place = 9 = 9
(300,000 + 20,000 + 0 + 700 + 40 + 9)
