Mathematics: I will mark brailiest if anyone answers the question right. show your work with working.

I will mark brailiest if anyone answers the question

Ответ:

timothycarter342

07.02.2022

Mathematics

remaining cardboard area = 122.5πr²

Step-by-step explanation:

area of original rectangle = length * width

= 18r * 8r

= 144r²

area of semi circle: $\frac{1}{2}$ πr²

Here we have 3 semi circles with radius 3r:

area of 3 semi circles: 3( $\frac{1}{2}$ * π * (3r)²)

: 3( $\frac{1}{2}$ * π * 9r²)

: 13.5πr²

area of one semi circle with radius 4r:

( $\frac{1}{2}$ * π * (4r)²)

( $\frac{1}{2}$ * π * 16r²)

8πr²

So the area of remaining cardboard:

area of rectangle - area of 4 semi circles

144r² - 13.5πr² - 8πr²

122.5πr²

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Ответ:

marisol56

02.01.2023

Mathematics

$\#1\\7(x-4)=7\times x-7\times4=7x-28\\\\\#2\\x(5-6)+13x-10=x(-1)+13x-10=-x+13x-10=12x-10\\\\\#3\\2.5(8-2x)+5(x+1)=2.5\times8-2.5\times2x+5\times x+5\times1\\=20-5x+5x+5=25\\\\\#4\\3(x+10)-3(2-4x)=3\times x+3\times10-3\times2-3\times(-4x)\\=3x+30-6+12x=15x+24$

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I will mark brailiest if anyone answers the question right. show your work with working.

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