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4 years ago

100 points!! Brainliest if correct!!

Mathematics

2 answers:

kogti [31]4 years ago

8 0

Answer:

Step-by-step explanation:

surface area=top circle+bottom circle+straight face

top circle=bottom circle=pi(w-1)^2

straight face=length*height=circle circumference*height

=2pi(w-1)(w+3)

surface area=2pi(w-1)^2+2pi(w-1)(w+3)

=2pi(w-1)(w-1+w+3)

=2pi(w-1)(2w+2)

=4pi(w-1)(w+1)

ladessa [460]4 years ago

3 0

Answer:

4π(w+1)(w-1)

Step-by-step explanation:

The total surface area of the cylinder

= 2 x area of base circle + area of vertical surface

= 2x pi x radius^2 + 2x pi x radius x height

= 2π(w-1)^2 + 2π(w-1)(w+3)

= 2π[w^2-2w+1 + w^2+2w-3]

= 2π(2w^2-2)

= 4π(w^2 - 1)

= 4π(w+1)(w-1)

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Twice the sum of x and y decreased by 23

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Answer:

2(x+y) - 23 or

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Step-by-step explanation:

twice the sum of x and y means

2(x+y)

decreased means minus or -

decreased by 23 means

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twice the sum of x and y decreased by 23

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$\displaystyle \boxed{(a+b)=a^2+2ab+b^2} \\ \\ (x+3)^2+2(x+3)= \\ x^2+2 \cdot x \cdot 3 +3^2+2x+6 = \\ x^2+6x+9+2x+6= \\ x^2+8x+15= \\ \\ \Delta= b^2-4ac \\ \Delta=8^2-4 \cdot1 \cdot15 \\ \Delta=64-60=4 \\ \\ \\ X_{1,2}= \frac{-b\pm \sqrt{\Delta} }{2a} = \frac{-8\pm2}{2} = \\ \\X1=5 \\ X2=3$