Answer:
14.54
Step-by-step explanation:
In a <em>weighted average</em> a “weight” is associated to each value.
The weighted mean is computed the following way:
Suppose you want to calculate the weighted mean of the values
a1, a1, …, an
with weights
w1, w2,..., wn
Then
<em>Weighted mean</em> =(w1*a1+w2*a2+... +wn*an)/(w1+w2+...+wn)
In this case we have
a1= 12, w1 = 8
a2 = 13, w2 = 6
a3 = 17, w3 = 12
<u>Weighted mean </u>
(12*8+13*6+17*12)/(8+6+12) = 14.54 rounded to 2 decimal places.
Answer:
SA = 3.04m²
Step-by-step explanation:
SA = 2 x ( Length x Width + Width x Height + Length x Height )
SA = 2 x ( 0.4 x 1 + 0.4 x 0.8 + 1 x 0.8 )
SA = 2 x ( 0.4 + 0.32 +0.8)
SA = 2 x 1.52
SA = 3.04 m²
I wish this could help you !
The answer is 523.6 and all you have to do is round it to the nearest hundredth
Answer: 
Step-by-step explanation:
1) Multiply the first equation by 3,and multiply the second equation by -5: 
, 
2) Simplify: 
, 
3) Add the equations to eliminate 
: 
4) Divide both sides by 
: 
5) Simplify: 
6) Substitute 4 for x in 
: 
7) Simplify: 
8) Subtract 
on both sides of the equation: 
9) Divide both sides by 
: 
10) Simplify: 
11) Write point:
