Answer:
Step-by-step explanation:
Let's start by writing what we know in mathematical terms.
A rectangle has a length that is 3 more than twice its width, means:
Now all we have to do is solve for one of these values. I'll choose W.
Rewrite the equation:
Input that information into our second equation and solve:
Find the two W values by factoring the equation (note that the Width can't be negative because you can't have a negative rectangle):
We pick the positive value 8 and plug it into our original equation to find Length:
Finally, after all that, we can use the formula of a perimeter using our newly found Length and Width values (remember not to forget "ft^2" when we get our answer):
5(4n-1)^2 +23(4n-1)-10
5(4n-1)^2 +25(4n-1)- 2(4n-1)-10
5(4n-1)(4n-1+5)- 2(4n-1+5)
(4n-1+5) (5(4n-1)-2)
(4n+4) (20n-5-2)
4(n+1) (20n-7)
I think it is 70 but not sure
Answer:
695.9913
Step-by-step explanation:
13% off of 799.99 is 695.9913
Answer:
{x,y}={
3
13
,
3
1
}
Step-by-step explanation:
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System of Linear Equations entered :
[1] x + 2y = 5
[2] x - y = 4
Graphic Representation of the Equations :
2y + x = 5 y + x = 4
Solve by Substitution :
// Solve equation [2] for the variable x
[2] x = y + 4
// Plug this in for variable x in equation [1]
[1] (y +4) + 2y = 5
[1] 3y = 1
// Solve equation [1] for the variable y
[1] 3y = 1
[1] y = 1/3
// By now we know this much :
x = y+4
y = 1/3
// Use the y value to solve for x
x = (1/3)+4 = 13/3
Solution :
{x,y} = {13/3,1/3}
