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Alla [95]
3 years ago
13

___(x – 2)2 − 4 = -3x2 + 12x − 16

Mathematics
1 answer:
fiasKO [112]3 years ago
8 0
The answer is x= 1/5 or 0.2
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A walkway is being installed around a rectangular playground. The playground is 30 feet by 12 feet, and the total area of the pl
worty [1.4K]

Answer:

10.3

Step-by-step explanation:

From these question, we can illustrate the playground has a small rectangle with 30x12ft

the walkway is around it with an area of 1288ft²

the playground area = 30 x 12 = 360ft²

the length dimension of the walkway is 30+y+y( these is because the walkway is round the playground in two sides) = 30 +2y

the breadth dimension of the walkway is 12+y+y ( these is because the walkway is round the playground in two sides) = 12+2y

Area of walkway = (30+2y)(12+2y)= 30(12+2y)+2y(12+2y) = 360+60y+24y+4y²= 360+84y+4y²

The total area = 1288ft²

The total area = area of walkway - area of playground

1288ft² = 360+84y+4y² - 360

choose like terms

1288 = 360-360+84y+4y²

1288 = 84y+4y²

divide by 4

322= 21y+y²

y²+21y-322 =0

using quadratic formula

x= (-b±√b²-4ac)/2a = {-21±√21²-4(1)(-322)}/2x1 =  {-21±√441+1288}/2x1  = -21±√1729/2

-21+√1729/2   -21-√1729/2

√1729 = 41.5812457726

-21+√1729/2   -21-√1729/2

{-21+41.5812457726}/2   {-21-41.5812457726}/2

20.5812457726/2          -62.5812457726/2

10.2906228863              -31.2906228863

we disregard the negative sign

our width is 10.2906228863 ≅10.3

4 0
3 years ago
Read 2 more answers
HELP Every female bear has 3 baby cubs. What is the constant of proportionality for the ratio of cubs to female bears? LOL DO NO
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Answer:

The constant of proportionality is 3 because for every 1 female bear there are 3 cubs and vice versa.

8 0
3 years ago
HELPPPPPPPPPPPPPPPPPPPPPPPPPPP
leonid [27]

Answer:

C

Step-by-step explanation:

the answer is c if thats what hour asking!

3 0
3 years ago
Can someone plz help me
Aleonysh [2.5K]

Answer:

C

Step-by-step explanation:

It makes sense

4 0
3 years ago
30. What is the degree of the polynomial?
zheka24 [161]

Answer:

Step-by-step explanation:

30). 5^{th} degree ( 4 + 1 = <em>5</em> ; 1 + 1 = 2 and 2 + 2 = 4 )

31) D) Choice D

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3 years ago
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