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PSYCHO15rus [73]
3 years ago
10

Solve x^2- 8x = 20 by completing the square. Which is the solution set of the equation?

Mathematics
1 answer:
yanalaym [24]3 years ago
5 0
The solution is -2 and 10
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Line segment AB is shown on a coordinate grid:
jenyasd209 [6]

A'B' and AB are equal in length because a rotation does change the length of a line segment it only changes it's position on the graph.

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The monthly cost of driving a car depends on the number of miles driven. Lynn found that in May her driving cost was $380 for 48
andrezito [222]

Answer:

y=0.2x+284

Step-by-step explanation:

Let  x be the distance driven, d-distance and C our constant.

Our information can be presented as:

y=mx+c\\\\450=830x+C\ \ \ \ \ \ \ \ \ eqtn 1\\\\380=480x+C\ \ \ \ \ \ \ \ \ eqtn 2

#Subtracting equation 2 from 1:

70=350x\\x=0.2

Hence the fixed cost per mile driven,x is $0.20

To find the constant,C we substitute x in any of the equations:

450=830x+C\ \ \ \ \ \ \ X=0.2\\\therefore C=450-830\times0.2\\=284

Now, substituting our values in the linear equation:

y=0.2x+284       #y=cost of driving, x=distance driven

Hence the linear equation for the cost of driving is y+0.2x+284

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2 years ago
HEYYYYYYYYYYY I NEED HELPPPPPP WILL GIVE BRAINLIST
tino4ka555 [31]

Answer:

1/3

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The obriens are buying new windows for their house. The company installs the new windows for 2100 the total cost for buying the
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Cost per window = 230.25

Cost of installation = 2100

Hence,

Total purchase cost of windows alone :

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Therefore, the number of windows purchased is :

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Consider ΔABC, where ∠C = 90° and ∠A + ∠B = 90°. Click on the statements that are true about the relationships of the angles Ang
Novay_Z [31]

Answer: Angles A and B are complementary angles

If Sin A ≈ 0.766 then Cos B ≈ 0.766.

If Cos B ≈ 0.766 then Sin A ≈ 0.766

Step-by-step explanation: In any given right angled triangle, one angle measures 90 degrees while the addition of the other two angles equals to 90 degrees. Hence if angle C is given as 90 degrees, then angles A and B added together equals 90 degrees (complementary angles equal 90 degrees).

Also, Sin A cannot be the same value as Sin B, since angle A and angle B are not equal in measurement. However, being complementary, the Sin of angle A equals the Cos of angle B.

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Therefore if Sin A ≈ 0.766, then Cos B ≈ 0.766

If Cos B ≈ 0.766 then Sin A ≈ 0.766 are both correct

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