Studied: 87, 100, 94, 79, 92, 100, 95, 83, 89, 99, 100, 91, 89, 95, 100, 93, 96, 83 Did Not Study: 82, 72, 45, 91, 58, 83, 65, 8
qwelly [4]
Answer:
Mean Of Students Who Studied: 92.5
Absolute Deviation: 5.2
I don't understand what the last part is asking.
Answer:
$33 savings
Step-by-step explanation:
The answer is 3. Point and line symmetry
Answer:
24x²y²
Step-by-step explanation:
For k=0 to n, the k-th term of (a+b)^n is ...
(nCk)·a^(n-k)·b^k
You want the k=2 term for the n=4 expansion with a=2x and b=-y.
Then the third term of the expansion is ...
(4C2)·(2x)^2·(-y)^2 = 6·4x^2·y^2 = 24x^2y^2
_____
nCk = n!/(k!(n-k)!)
4C2 = 4!/(2!·2!) = (4·3)/(2·1) = 6
Add 4 to the second equation to get
.. 3b = 6
Substitute this into the first equation to get
.. 2a +6 = 12
.. 2a = 6 . . . . . . . subtract 6
.. a = 3 . . . . . . . . divide by 2
The value of a is 3.