3 years ago

In a certain class , 7/10 of the students got problem 15 wrong on Friday's math test.

Mathematics

1 answer:

Marat540 [252]3 years ago

7 0

Answer:

whats the question

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Given the sequence in the table below, determine the sigma notation of the sum for term 4 through term 15.

Naya [18.7K]

It's a geometric sequence.

$4,-12,36,... \\ \\
a_1=4 \\
r=\frac{a_2}{a_1}=\frac{-12}{4}=-3 \\ \\
a_n=a_1 \times r^{n-1} \\
a_n=4 \times (-3)^{n-1} \\
a_n=4 \times (-3)^{-1} \times (-3)^n \\
a_n=4 \times (-\frac{1}{3}) \times (-3)^n \\
a_n=-\frac{4}{3}(-3)^n$

It's the sum for term 4 through term 15.

$\boxed{ \sum\limits_{n=4}^{15} (\frac{4}{3}(-3)^n)}$

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2 years ago

Round 51.78 to the greatest number.

soldier1979 [14.2K]

Answer:

Step-by-step explanation:

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2 years ago

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pe ling needs 2 yards of fabric for a craft project. she has 3 feet already.how many niches of fabric does she still need?

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2yards= 72 inches
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so now that you know that, you know that she needs 6 feet and already has 3 feet. so she just needs 3 feet more. but they are asking for the answer to be in inches.

3 feet= 36 inches
your answer in 36 inches

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2 years ago

The sum of the numbers as the product of their GCF and other sum so what is 32 plus 20???

densk [106]

I dont quite undeerstand but the gcf for both are..., if that helps is 4 because
30:2*2*2*2*2
22:2*2 5

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2 years ago

A rectangle is 3 feet longer than it is wide . if the perimeter is 30 feet , find the area in square feet .

noname [10]

Answer:

Hey

Step-by-step explanation:

I beleve you answer is 10 because 3 time 10 equals 30 and the question sais "3 times longer"

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3 years ago