3 years ago

Simplify 9r-2s-4r-3s

Mathematics

2 answers:

antiseptic1488 [7]3 years ago

7 0

Answer:

5r - 5s

Step-by-step explanation:

9r-2s-4r-3s

Combine like terms

9r -4r -2s -3s

5r -5s

bezimeni [28]3 years ago

5 0

Answer:

5r -5s

Step-by-step explanation:

9r-2s-4r-3s

Combine like terms

9r -4r -2s -3s

5r -5s

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3 years ago

What is the surface area of a cone that has a radius of 8 feet and a slant height of 12 feet? (Use 3.14 for π.)

kodGreya [7K]

Answer:

Surface area of cone is $502.4\ ft^2$

Step-by-step explanation:

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radius of a cone (r) = 8 feet

slant height of cone (l) = 12 feet

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Now we know that,

Area of circle = $\pi r^2$

Area of curved surface = $\pi rl$

Hence Total surface area of cone = $\pi r^2+\pi rl=\pi r(r+l) = 3.14 \times 8 (8+12)=3.14\times8\times20= 502.4 \ ft^2$

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