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Leya [2.2K]
2 years ago
7

If n represents a number in the following sequence, the next term in the sequence can be determined by using which of the follow

ing expressions? 1 , 3 , 9 , 27 ...
Mathematics
2 answers:
OlgaM077 [116]2 years ago
5 0
An=a1(r)^(n-1)
a1=first term
an=nth term
r=common ratio
n=which term

each term is 3 times the previous
seems to be a geoemetric sequence
common ratio is 3
first term is 1

so
an=1(3)^(n-1)
the next term can be found by doing
f(n+1)=3f(n)
Kamila [148]2 years ago
4 0
27/3=9/3=3/3=1
r=3
a1*(3)^(n-1)
a1=1
3^(n-1) 
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Here is a triangular pyramid and its net.
bazaltina [42]

Answer:

a) Area of the base of the pyramid = 15.6\ mm^{2}

b) Area of one lateral face = 24\ mm^{2}

c) Lateral Surface Area = 72\ mm^{2}

d) Total Surface Area = 87.6\ mm^{2}

Step-by-step explanation:

We are given the following dimensions of the triangular pyramid:

Side of triangular base = 6mm

Height of triangular base = 5.2mm

Base of lateral face (triangular) = 6mm

Height of lateral face (triangular) = 8mm

a) To find Area of base of pyramid:

We know that it is a triangular pyramid and the base is a equilateral triangle. \text{Area of triangle = } \dfrac{1}{2} \times \text{Base} \times \text{Height} ..... (1)\\

{\Rightarrow \text{Area of pyramid's base = }\dfrac{1}{2} \times 6 \times 5.2\\\Rightarrow 15.6\ mm^{2}

b) To find area of one lateral surface:

Base = 6mm

Height = 8mm

Using equation (1) to find the area:

\Rightarrow \dfrac{1}{2} \times 8 \times 6\\\Rightarrow 24\ mm^{2}

c) To find the lateral surface area:

We know that there are 3 lateral surfaces with equal height and equal base.

Hence, their areas will also be same. So,

\text{Lateral Surface Area = }3 \times \text{ Area of one lateral surface}\\\Rightarrow 3 \times 24 = 72 mm^{2}

d) To find total surface area:

Total Surface area of the given triangular pyramid will be equal to <em>Lateral Surface Area + Area of base</em>

\Rightarrow 72 + 15.6 \\\Rightarrow 87.6\  mm^{2}

Hence,

a) Area of the base of the pyramid = 15.6\ mm^{2}

b) Area of one lateral face = 24\ mm^{2}

c) Lateral Surface Area = 72\ mm^{2}

d) Total Surface Area = 87.6\ mm^{2}

3 0
3 years ago
Pls answer i'll mark u brainlist
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Since It's 2.5 times the original speed,

2.5x = 5/3

so x = 5/3/2.5 = 2/3

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