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Mrac [35]
3 years ago
6

Plz help!! 20 points!! on the line plz give me a real answer

Mathematics
1 answer:
erastova [34]3 years ago
3 0

Answer:

62.5 feet

Step-by-step explanation:

first you find the area of the triangles by using the formula b*h /2 to get 9 3/8.  then since they are all the same size you can multiply it by 4 to get 37.5.  then you find the area of the square which is 25.  finally add the totals together to get 62.5

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Kathy is fencing in her yard that has an area of 800 square feet. Her yard is in the shape of a rectangle where the length is 60
anygoal [31]

Answer:

The dimensions of the yard are W=20ft and L=40ft.

Step-by-step explanation:

Let be:

W: width of the yard.

L:length.

Now, we can write the equation of that relates length and width:

L=5W-60 (Equation #1)

The area of the yard can be expressed as (using equation #1 into #2):

Area=W*L=W*(5W-60) (Equation #2)

Since the Area of the yard is 800 ft^2, then equation #2 turns into:

800=W*(5W-60)

Now, we rearrange this equation:  

800=W*(5W-60)//800=5W^2-60W//5W^2-60W-800=0

We can divide the equation by 5 :

W^2-12W-160=0

We need to find the solution for this quadratic. Let's find the factors of 160 that multiplied yields -160 and added yields -12. Let's choose -20 and 8, since (-20)*8=160 and -20+8=-12. The equation factorised looks like this:

(W-20)(W+8)=0

Therefore the possible solutions are W=20 and W=-8. We discard W=-8 since width must be a positive number. To find the length, we substitute the value of W in equation #1:

5*20-60=40

Therefore, the dimensions of the yard are W=20ft and L=40ft.

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What related number sentence shows the commutative property of addition 3plus8equl12
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<span>the value of the number one in 61 is 1
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