Mathematics, 24.06.2019 19:30 zania30

The length of a rectangle is 3 feet more than twice the width. the perimeter is 128 feet. find the length and width in feet.

Answers: 2

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Answer from: Mw3spartan17

w = 20 1/3 ft.

l = 43 2/3 ft.

Step-by-step explanation:

w=width l = length

l = 3 + 2w

128 = 2l + 2w

128 = 2(3 + 2w) + 2w

128 = 6 + 4w +2w

122 = 6w

20 1/3 = w

Answer from: Aliciaonfleek

Step-by-step explanation:

The first part of finding the length and width of this rectangle is defining each of the lengths as variables. We usually do this by writing, "let" for each statement. Let's try!Let x = the width 2x + 3 = the length

Now, let's define the perimeter in terms of x. So, we understand that the perimeter consists of the width times 2 and the length times 2. It's simply how rectangles work, right? Let's do this, then! Let's find the perimeter in terms of x!

2(x) + 2(2x + 3)==2x + 4x + 6=6x + 6

Considering the width of the rectangle is x and the length is 2x + 3, the perimeter of the rectangle is 6x + 6. But hey, we already know what the actual perimeter of the rectangle is! Let's make a system of equations! (We're getting a little advanced here but it's alright, ask me questions if you need to!)

Let P = total perimeter of the rectangleP = 6x + 6P = 128 feetWe can solve this system of equations by using the equal values method. If you need more help, you can search the equal values method on the internet. If you need more explanation, please ask!Now we know that both 6x + 6 and 128 are both equal to P. This means that 6x + 6 and 128 are equal, too! We can now make an equation to find x, the width!6x + 6 = 128 - 6 - 66x = 122x = 122/6 = 20 ¹/₃ feetSince we have already defined x as 20 1/3 feet. Now we can find the length, 2x + 3. We can plug x into the equation.2 ( 20 ¹/₃ ) + 3 = length40 ²/₃ + 3 = lengthlength = 43 ²/₃.Now we can check our work!6x + 6 = 1286(20 ¹/₃) + 6 = 1286(20 ¹/₃) = 122If we multiply 6 and 20 ¹/₃, we find the product as 122. This means that x is true in the situation and that it is correct.If you need help, please tell me in the comments! I'm happy to help! <3

Answer from: Quest

$4\left(625^4\right)\left(y^6\right)$

step-by-step explanation:

given expression is $4\sqrt{625^8y^{12}}$ .

now we need to simplify the given expression $\sqrt{20y^8}$ .

we know that square root is equivalent to the power 1/2. so that means we can take half of the exponents to get the square root of given expression.

$4\sqrt{625^8y^{12}}$

$=4\left(625^8y^{12}\right)^{\frac{1}{2}}$

$=4\left(625^8\right)^{\frac{1}{2}}\left(y^{12}\right)^{\frac{1}{2}}$

$=4\left(625^4\right)\left(y^6\right)$

expanding that will give a very very large number so let's keep answer in exponent form.

Answer from: Quest

hi there

the slope is 1/3.

this is because from the y-intercept, you go up one, and you go to the right three, to get to the next exact point on the graph. this is known at the “rise over run.”

p.s. (if you need it).your y-intercept is -2, because that is the point on the graph where the line crosses the y-axis.

hope that : )

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