A ) 17 because 4*2+9=8+9=17
Answer:
2+11+16=11+16+2
Step-by-step explanation:
According to the commutative law of addition,
(A+B)+C=(C+B)+A
i.e.A+B+C=C+B+A
Answer:
The Potential Energy of the twins and the carriage is 9878.4 J.
Step-by-step explanation:
Given;
height of the knoll above the ground level, h = 21 m
mass of the carriage with the babies, m = 48 kg
The potential Energy of the twins and the carriage is given by;
P.E = mgh
where;
g is the acceleration due to gravity = 9.8 m/s²
Substitute the givens;
P.E = (48)(9.8)(21)
P.E = 9878.4 J
Therefore, the Potential Energy of the twins and the carriage is 9878.4 J.
Elimination
multiply first equation by -1 and add to 2nd
-18x+16y=312
<u>78x-16y=408 +</u>
60x+0y=720
60x=720
divide both sides by 60
x=12
sub back
18x-16y=-312
18(12)-16y=-312
216-16y=-312
-16y=-528
divide both sides by -16
y=33
x=12
y=33
(x,y)
(12,33)
The easiest way to solve this problem would be to use the pythagorean theorem. Plug in the information you know. 25 will have to be c because it is the hypotenuse. You can plug 7 in for a or b. It does not matter which one you plug 7 in for because you will still get the same answer.
This is what it should look like:
7^2 + b^2 = 25^2
Now solve the equation.
7^2 = 49
25^2 = 625
The new equation will be 49 + b^2 = 625
Now subtract 49 from 625.
625 - 49 = 576
b^2 = 576
Now take the square root of both sides to get b by itself.
b = 24
Your answer should be: The ladder reaches 24 ft. high on the building.
