X+ (x+2)+ (x+4)= -21
3x+6=-21
3x=-27
x=-9
Final answer: -9, -7, -5
Answer:
radioactive dating of rocks
Answer:
28
Step-by-step explanation:
This is a trapezoid of width 4 and legs 8 and 6.
First we find the average length; it is (8 + 6)/2, or 7.
Next we multiply this length (7) by the width (4), obtaining the area: 28
Answer:
The length that would produce the least expenses is 
The width that would produce the least expenses is 
Step-by-step explanation:
From the question we are told that the
Required area to enclose is 
Fencing material cost is
$4 per foot for north and south
Fencing material cost for east and west
$8
The diagram for this question is shown on the first uploaded image
From the diagram is mathematically evaluated as
AB = 45000
=> 
The overall cost of building this fence is

Substituting for B in the equation above

differentiating both sides with respect to x

At minimum possible cost 
=> 




Then B is mathematically evaluate as


Then the maximum is mathematically evaluated as

=$4800