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guajiro [1.7K]
3 years ago
13

A geometric sequence has an initial value of 1/2 and a common ratio of 8. Write an exponential function to represent this sequen

ce.
A: f(X) = 8· (1/2)^x
B: f(X) = 8· (1/2)^-1
C: f(x) = 1/2 ·8^x
D: f(x) = 1/2 ·8^x-1

please help me
Mathematics
2 answers:
Airida [17]3 years ago
8 0

Answer:

The correct option is  D.

Step-by-step explanation:

It is given that the initial value of a GP is 1/2 and common ratio is 8. It means

a_1=\frac{1}{2}

r=8

The nth term of a GP is

a_n=a_1r^{n-1}

where, a_1 is inital value and r is common ratio.

Substitute a_1=\frac{1}{2} and r=8 in the above formula.

a_n=\frac{1}{2}(8)^{n-1}

The exponential function to represent this sequence is

f(x)=\frac{1}{2}(8)^{x-1}

Therefore the correct option is D.

marusya05 [52]3 years ago
6 0

Answer:

D

Step-by-step explanation:

the n th term of a geometric sequence is

a_{n} = ar^{n-1}

Where a is the first term and r the common ratio

here a = \frac{1}{2} and r = 8, hence

f(x) = \frac{1}{2}(8)^{x-1} → D


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In the first three options , one single element in domain has more than one image.

(-2,3), (-2, 2), (-2, 1), (-2, 0)

here -2 as an element in the domain has 3,2,1,0 has image-----> so not a function

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Here 10 , an element in the domain has 15,6 as image-----> so not a function

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Here 3, as an element in the domain has 8 and 2 as image-----> so not a function

So, OPTION D

(1,6), (2, 5), (10, 5), (-17, 8)

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Answer:

Step-by-step explanation:

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Phoenix [80]

Answer:

The weight of the object is 3 kg.

Step-by-step explanation:

<u>Step 1: </u>

Let object weight be x kg.

Now, as per the available data,

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<u>Step 2: </u>

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x = 1 / (1/3)

x = 3

Weight of Object is 3 kg.

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Let's check if this value satisfies the first equation.

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Answer:

970,200

Step-by-step explanation:

In a 100 man race, how many runners have the chance to finish first?

Answer 100.

Now that 1 person is first, how many runners could be second? Well, there are still 99 runners left, and any one of them could be second.

Answer 99.

How many can be third? Using the same idea as above, once one person is first and another is second, that leaves 98 people still running and trying for third. So how many can be in third?

Answer 98.

Now you need to do the math.

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So there are 970,200 different ways.

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