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3 years ago

What is the 13th term in the arithmetic sequence described by this explicit formula? a(n) = 84 + (n – 1)(–6)

Mathematics

1 answer:

Vinvika [58]3 years ago

5 0

Answer:

Step-by-step explanation:

Just place 13 instead of n.

a(13) = 84 + (13 - 1)(-6)

= 84 + (12)(-6)

= 84 + (-72)

= 84 - 72

= 12(Answer)

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4 years ago

The lateral area of a cone is 9.81 in. The radius is 1.4 in. Find the slant height.

earnstyle [38]

Answer:

As Per Provided Information

Lateral area of cone is 9.81 in
Radius of cone is 1.4 in

We have been asked to determine the slant height of the cone .

Formula used to calculate the lateral area of a cone is

$\boxed{\bf \: \purple{ Lateral \: Area _{(Cone)} \: = \pi\:rl}}$

here

l denote slant height

r denote radius

Substituting the value we obtain

$\longrightarrow\tt \: 9.81 = 3.14 \times 1.4 \times l \\ \\ \\ \longrightarrow\tt \:9.81 = 4.396 \times l \\ \\ \\ \longrightarrow\tt \: \cfrac{9.81}{4.396} = l \\ \\ \\ \longrightarrow\tt \: \: l \: = \cfrac{9.81}{4.396} \\ \\ \\ \longrightarrow\tt \: \: l \: = \cancel\cfrac{9.81}{4.396} \\ \\ \\ \longrightarrow\tt \: \: l \: = 2.23 \:inch \: \: (approx)$

Therefore,

Slant height of the cone is 2.23 in .

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2 years ago