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sergij07 [2.7K]
3 years ago
6

Need help with 8th grade algebra

Mathematics
1 answer:
TEA [102]3 years ago
5 0

Answer:

D

Step-by-step explanation:

z-m=z+bx

z-m-z=bx

bx=-m

x= - m/b

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Jensen wants to hang a mirror in his boat and put a frame around it. The mirror and frame must have an area of 19.75 square feet
Ber [7]
The third choice, 4x²+18x+0.25=0, is correct.

The frame will have the same thickness on both sides of the mirror.  Therefore we add 5+x+x to get the total length, and we have 4+x+x to get the total width. 

The area is found by multiplying the total width and total length:

A=(5+x+x)(4+x+x)
A=(5+2x)(4+2x)

Multiplying the binomials, we have:
A=5*4+5*2x+2x*4+2x*2x
A=20+10x+8x+4x²
A=20+18x+4x²

We know that the area is 19.75:
19.75=20+18x+4x²

We need quadratics set equal to 0, so subtract 19.75 from each side:
19.75-19.75 = 20+18x+4x²-19.75
0=0.25+18x+4x²


In standard form, it will be:
4x²+18x+0.25=0
6 0
3 years ago
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Kitty [74]

Answer:

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Step-by-step explanation:

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rjkz [21]

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Option D is the correct answer.
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