Mathematics: I NEED CORRECT ANSWERS ONLY!!! PLZ DONT JUST ANSWER FOR POINTS! TY! Ellis is painting wooden fenceposts before putting them in his yard. They are each 5 feet tall and have a diameter of 1 foot. There are 10 fenceposts in all. How much paint will Ellis need to paint all the surfaces of the 10 fenceposts? Use 3.14 for π, and round your answer to the nearest hundredth. Provide an explanation and proof for your answer to receive full credit.

I NEED CORRECT ANSWERS ONLY!!! PLZ DONT JUST ANSWER

Ответ:

kingofguns2826

18.09.2021

Mathematics

• The posts are cylindrical like.

$\dashrightarrow \: { \tt{area = \pi rh}}$

• r is radius, r → ½ feet

• h is height, h → 5 feet

$\dashrightarrow \: { \tt{area = 3.14 \times \frac{1}{2} \times 5 }} \\ \\ { \tt{area = 7.85 \: {ft}^{2} }}$

but 1 ft = 30.5 cm

• 1 ft² = 930.25 cm

${ \tt{ {2.8 {}^{3} \: ft}^{3} = (7.84 \times 30.5) {}^{3} \: {cm}^{3} }} \\ \\ { \tt{7.84 \: {ft}^{3} = {4.88 \times {10 }^{6} } \: {cm}^{3} }} \\ \\$

since there are 10 posts:

${ \boxed{ \tt{amount = 4.88 \times {10}^{7} \: litres}}}$

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Ответ:

kaylynchalman

18.09.2021

Mathematics

Diameter=1ftRadius=Diameter/2=1/2ftHeight=5ft

$\\ \sf\longmapsto Volume=\pi r^2h$

$\\ \sf\longmapsto Volume=3.14\left(\dfrac{1}{2}\right)^25$

$\\ \sf\longmapsto Volume=3.14\times \dfrac{1}{4}\times 5$

$\\ \sf\longmapsto Volume=3.14(0.25)(5)$

$\\ \sf\longmapsto Volume=3.14(1.25)$

$\\ \sf\longmapsto Volume=3.925ft^3$

Volume of 10fences

$\\ \sf\longmapsto 10(3.925)=39.25ft^3$

Now

1ft^3=28.1L

$\\ \sf\longmapsto 39.25ft^3$

$\\ \sf\longmapsto 39.25(28.1)$

$\\ \sf\longmapsto 1102.1\ell$

Elis need 1102.1L paint to complete painting the wall

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Ответ:

KieraKimball

15.02.2021

Mathematics

Whenever multiplying by 10 you just add a zero
so 10+10=20 and is equal to 10x2=20 see it just added a zero
so 10x25=250

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