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quester [9]
3 years ago
5

-7=21+x help please thankyou

Mathematics
2 answers:
serg [7]3 years ago
4 0
Move the 21 to the other side and change the sign

-7-21=x
x=-28

hope this helps
Readme [11.4K]3 years ago
4 0
Subtract 21 on both sides.

-7-21=21-21+x
-7-21=x
x=-28

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The area of a rectangular wall of a barn is 252 square feet. Its length is 10 feet longer than twice its width. Find the length
valentinak56 [21]

Answer: Length = 28 feet and width = 9 feet

Step-by-step explanation:

Let x = width of the wall.

Then, Length of the wall =  10+2x

Since , Area of rectangle = length x width

Then, as per given,

252= (10+2x)x\\\\\Rightarrow\ 252=10x+2x^2\\\\\Rightarrow\ 2x^2+10x-252=0\\\\\Rightarrow\ x^2+5x-126=0\\\\\Rightarrow\ x^2+14x-9x-126=0\\\\\Rightarrow\ (x+14)-9(x+14)=0\\\\\Rightarrow\ (x+14)(x-9)=0\\\\\Rightarrow\ x=-14 \ or \ x= 9

Since width cannot be negative , so x = 9

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7 0
3 years ago
6x – 7y = 25<br> 15x+3y = 42
Dmitrij [34]
The answer would =-1
8 0
3 years ago
Please help me on this problem
tester [92]

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79.5 in ^3

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5 times 8 times 2.

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3 0
3 years ago
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A manufacturer of bolts has a​ quality-control policy that requires it to destroy any bolts that are more than 4 standard deviat
Doss [256]

Answer:

more than 15.40 cm and less than  14.60 cm

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3 years ago
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it literally doubles in size

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3 years ago
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