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igor_vitrenko [27]
3 years ago
9

Use mental math to find 80% of 20.

Mathematics
1 answer:
AlladinOne [14]3 years ago
4 0

Answer:

the anwer is 18 hope that is right

Step-by-step explanation:

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f a rectangle has a perimeter of 70, a length of x and a width of x - 9, find the value of the length of the rectangle.
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( x + (x  -  9))  \times 2 = 70 \\( 2x - 9) \times2= 70 \\ 4x - 18 = 70 \\ 4x = 70 + 18 = 88
x =  \frac{88}{4}  = 22
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and the width is
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The figure below shows two half-circles at the ends of a rectangle with the dimension shown.
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