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Fed [463]
3 years ago
6

Hope someone can.help.me with this

Mathematics
1 answer:
Serga [27]3 years ago
6 0

68+33+34+10= 145 m

then your cm's

700+400= 11 m

145+11= 156 m

then we need to add half of the total circumference of that circle which we can find with the provided 17 m radius

Now C =2(3.14)^r

in this case C = 106.81 m

106.81/2= 53.405 m

this can then be added to our previous sum of 156 m

156 + 53.405 = 209.405 m as the total perimeter !



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3 years ago
Which of the following is a geometric series? 40 + 50 + 60 + 70 40 + 42 + 44 + 46 40 + 80 + 40 + 120 40 + 20 + 10 + 5
Aloiza [94]

Answer:

40 + 20 + 10 + 5 is a geometric series

Step-by-step explanation:

* Lets revise the geometric series

- There is a constant ratio between each two consecutive numbers

- Ex:

# 5  ,  10  ,  20  ,  40  ,  80  ,  ………………………. (×2)

# 5000  ,  1000  ,  200  ,  40  ,  …………………………(÷5)

* General term (nth term) of a Geometric Series:

∵ U1 = a  ,  U2  = ar  ,  U3  = ar2  ,  U4 = ar3  ,  U5 = ar4

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* Now lets check the answers to find the correct one

# 40 + 50 + 60 + 70

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∵ 60/50 = 6/5

∵ 5/4 ≠ 6/5

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# 40 + 42 + 44 + 46

∵ 42/40 = 21/20

∵ 44/42 = 22/21

∵ 21/20 ≠ 22/21

- No common ratio between each two consecutive terms

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∵ 80/40 = 2

∵ 40/80 = 1/2

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- No common ratio between each two consecutive terms

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# 40 + 20 + 10 + 5

∵ 20/40 = 1/2

∵ 10/20 = 1/2

∵ 5/10 = 1/2

- There is a common ratio between each two consecutive terms

∴ 40 + 20 + 10 + 5 is a geometric series

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