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kobusy [5.1K]
3 years ago
7

the second term in a geometric sequence is 20. the fourth term in the same sequence is 45/4 or 11.25. what is the common ratio

Mathematics
1 answer:
slega [8]3 years ago
5 0
4th term / second term  = a1r^3 / a1r = r^2

so r^2  = 45/4 / 20 = 45/80  = 9/16

so r = sqrt 9/16  = 3/4  answer
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Determine the scale factor of the function f(x)=3/x
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3 years ago
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A man drove x miles per hour for 3e hours and (2x-60) miles per hour for the next 4.75 hours. Express the total distance he trav
avanturin [10]

Answer:

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Total distance covered by the man in terms of 'x' = (12.5x-285)miles

Step-by-step explanation:

Given:

Speed of  a man = 'x' miles/hour

Time taken = 3 hour

So, distance = product of speed and time.

Distance covered in term of 'x' =(d_1=3x)

Now,

Speed = (2x-60) miles/hour

Time taken= 4.75 hours

Distance (d_2)  = (2x-60)\times 4.75

                      = (2x\times 4.75) -(60\times 4.75)

                      = (9.5x - 285) miles

Total distance covered by the man = Summation of  d_1 and d_2

                                                           = (9.5x-285+3x)

                                                           = (12.5x-285) miles

So the total distance covered by the man in terms of 'x' = (12.5x-285) miles.

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4 years ago
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umka21 [38]

Answer:

A) 0.39

Step-by-step explanation:

A=\pir²=0.38925589615

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