11 hours and 15 minutes because doing 2.25, which is equal to 2 hours and 15 minutes, times 5 you end up getting 11.25, and converting that to time you get 11 hours and 15 minutes.
Answer:
Step-by-step explanation:
Known fact: all roots of quadratic equation are real if and only if
discriminant
We know that all roots of are real. We can derive from this condition that
. (<----------- HERE)
Let's do some simplification of second equation:
So we want according to Known fact prove that discriminant of equation
is greater or equal zero.
.
To prove that , we can view D as polynomial of a:
.
Known fact #2: if quadratic polynomial have positive greatest coefficient and it's discriminant then polynomial always positive.
So remains to prove that
lets divide both side by :
divide by 3
transfer terms to the other side:
But we know that from "(<----------- HERE)"!!!
So Q.E.D.
Answer:
5m-n-4p
4a^2+6x-3
Step-by-step explanation:
3m-4n +7p
-5m +9n -6p
+7m -6n -5p
----------------------
Combine like terms
3m-4n +7p
-5m +9n -6p
+7m -6n -5p
----------------------
(3-5+7)m +(-4+9-6)n +(7-6-5)p
5m-n-4p
a^2 -3x +1
a^2 +9x -6
2a^2 +0x +2
----------------------
Combine like terms
a^2 -3x +1
a^2 +9x -6
2a^2 +0x +2
----------------------
(1+1+2)a^2 +(-3+9+0)x +(1-6+2)
4a^2+6x-3
9. 1 mile equals 5,280ft. So you would multiply 5,280 by 10 and come up with 52,800ft.
12. Add 5,280 plus 900 and you would come up with 6,180 so the sign is greater than.
15. Multiply 40 by 12 and you get 480ft so therefore the sign is also greater than.