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Nataliya [291]
3 years ago
12

Please help solve correctly. NO links or files. Correct answers only if not report. I will even give an additional 10 if correct

.

Mathematics
1 answer:
mezya [45]3 years ago
5 0

Answer:

144.51326 cm^{2}

Step-by-step explanation:

A = 2πrh + 2πr^{2}

d = 4

r = 4/2 = 2 cm

h = 9.5cm

A = 2π(2)(9.5) + 2π(2)^{2}  = 144.51326 cm^{2}

Don't know if you need to round it or not

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The length of a rectangle is the sum of the width and 4. The area of the rectangle is 32
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Answer:

The width of rectangle w = 4 units

Step-by-step explanation:

We are given:

Width of rectangle = w

Length of rectangle = w+ 4

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The formula used is: Area\:of\:rectangle=Length\times Width

Putting values and finding width of rectangle

Area\:of\:rectangle=Length\times Width\\32=(w+4)\times w\\32=w^2+4w\\w^2+4w-32=0

We need to solve this quadratic equation to find width (w)

We will use factorisation and break the middle term.

w^2+4w-32=0\\w^2+8w-4w-32=0\\w(w+8)-4(w+8)=0\\(w-4)(w+8)=0\\w-4=0\:or\:w+8=0\\w=4\:or\:w=-8

Since width of rectangle can't be negative, so rejecting w=-8

Therefore, the width of rectangle w = 4 units

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Step-by-step explanation:

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