B, 7.8 & 7.9; Since the square root of 61 is 7.81024, then that means it would lie just above 7.8 in the number line.
This problem is resolved with the Pythagorean Theoreme.
It states that the length of the side that is the hypotenuse (the side opposite the right angle) is equal to the square root of the sum of the length of the other two sides squared.
So we know that the ground and the building form the right angle, so the hypotenuse is the length of the ladder (L) and the building (B) and the ground (G) are the other sides of the triangle (legs). So by the pythagorean theoreme:
L = √ (G^2+B^2)
As we already know the length of the hypotenuse, we have to isolate the variable that we don’t know (B).
B = √(H^2-G^2)
Replacing:
B = √(7^2-2^2)
B= √(49-4)
B = √45
B = 6,7 feet
I hope you find my answer helpful.
There are seven (7) friends.
The first friend to board can be any one of the 7. For each of them ...
The 2nd one to board can be any one of the remaining 6. For each of them ...
The 3rd one to board can be any one of the remaining 5. For each of them ...
The 4th one to board can be any one of the remaining 4. For each of them ...
The 5th one to board can be any one of the remaining 3. For each of them ...
The 6th one to board can be either of the remaining 2. For each of them ...
The 7th one to board is the last 1 standing.
(7 x 6 x 5 x 4 x 3 x 2 x 1) = <span>5,040</span>
4;81
You subtract 5 from 9 to get 4; 5(9)= 45 9(4)=36 45+39=81