Answer:
5/6 or 50 minutes
Step-by-step explanation:
Ok so first thing you want to do is find the rates of both the girls and add them up:
Amanda can finish 1 room in 2 hours
hence,
1/2 ( rooms/hours)
And we know Monica can paint the same room in 3 hours:
1/3
Now add them together such that the equation is \:
1/2+1/3=1/x . x being the total hours they can finish the room together.
Once you add those you should get 5/6!!!
Answer:
26*26*25 = 16,900
Step-by-step explanation:
First, we focus on the first initial, we have 26 letters that could fit in (the whole alphabet).
In the last initial we <em>can't</em> have the same we have in the first one, so we have 25 letters (the whole alphabet minus the letter that we already choose in the first initial
).
We have <em>no restrictions</em> for the middle one, so again we have 26 letters that could fit in.
So, we have 26*26*25 combinations (we multiply them because they happen all at the same time)
There is no need to use factorials, but we can use them if you want to.
Let's notice that 26! = 26*25*24*23*22*...
In our calculation, we only need the two first factors, so we can divide by 24! =24*23*22*21*...
Therefore,
26*26*25 = 26 * 26! /24!
Answer:
27
Step-by-step explanation:
4 times 4 is 16
2 boxes in the middle
4 tiny boxes in each one in the middle
1 entire one on the outside
1+4+4+2+16= 27
Answer:
10
Step-by-step explanation:
12-6+4
Answer:
(3, - 3 )
Step-by-step explanation:
Given the 2 equations
3x - 5y = 24 → (1)
- 3x - 6y = 9 → (2)
Adding the 2 equations term by term will eliminate the x- term, that is
- 11y = 33 ( divide both sides by - 11 )
y = - 3
Substitute y = - 3 into either of the 2 equations and solve for x
Substituting into (1)
3x - 5(- 3) = 24
3x + 15 = 24 ( subtract 15 from both sides )
3x = 9 ( divide both sides by 3 )
x = 3
solution is (3, - 3 )