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Pepsi [2]
3 years ago
8

Explain how you should use the formula to calculate the number of pennies on Rows 1-4. Why use the formula?

Mathematics
1 answer:
Hunter-Best [27]3 years ago
4 0

Answer:

S_{n}=15

Step-by-step explanation:

from the question given i can infer that it is a geometric sequence. this question is asking for the sum of the first four pennies in on the row

therefore using the formula for the sum of a geometric sequence which is

S_{n} =\frac{a(r^{n}-1) }{r-1}

so substituting the values of a, r and n into the the equation above

S_{4}=\frac{1(2^{4}-1) }{2-1}  \\S_{4} =\frac{1(16-1)}{1} \\\\\S_{4} =1(15)\\S_{4} =15  

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Sergeeva-Olga [200]

Answer:

I got 2 as an answer

Step-by-step explanation:

( {3x}^{4} ) - 5 = 43 \\ ( {3x}^{4} ) = 43 + 5 \\ ( {3x}^{4} ) = 48 \\  \frac{ {3x}^{4} }{3}  =  \frac{48}{3}

{x}^{4}  = 16 \\  \sqrt[4]{ {x}^{4} }  =  \sqrt[4]{16}  \\ x = 2

6 0
4 years ago
The radius of a circle is 2.6 in. Find the circumference <br> to the nearest tenth.
Georgia [21]

Answer:

16.

Step-by-step explanation:

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5 0
3 years ago
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galina1969 [7]
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7 0
4 years ago
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mrs_skeptik [129]
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3 years ago
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sineoko [7]

Answer:

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Step-by-step explanation:

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