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Romashka [77]
2 years ago
11

Which expressions are equivalent to 2(2x + 4y + x − 2y)?

Mathematics
1 answer:
Greeley [361]2 years ago
5 0
C should be your answer:))))
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Find S^20 if the series 1 + 1.1 ..... is a (a) arithmetic (b) geometric
quester [9]
I'm guessing S^20 is actually referring to the 20th partial sum S_{20}, with

S_{20}=1+(1+1\times0.1)+(1+2\times0.1)+\cdots+(1+18\times0.1)+(1+19\times0.1)

in the arithmetic case, and

S_{20}=1+1.1+1.1^2+\cdots+1.1^{18}+1.1^{19}

in the geometric case.

(a) Combining like terms, we have

S_{20}=20+0.1(1+2+\cdots+18+19)

and invoking the formula

1+2+\cdots+(n-1)+n=\dfrac{n(n+1)}2

we end up with

S_{20}=20+0.1\dfrac{19\times20}2=39

(b) Multiply S_{20} by 1.1, then subtract this from S_{20}:

1.1S_{20}=1.1+1.1^2+1.1^3+\cdots+1.1^{19}+1.1^{20}

S_{20}-1.1S_{20}=-0.1S_{20}=1-1.1^{20}
\implies S_{20}=\dfrac{1.1^{20}-1}{0.1}\approx57.275
7 0
3 years ago
The answer to all of these questions
11111nata11111 [884]
The first answer to the question is male . I don’t know about the rest right now because my phone is cracked and I’m having issues seeing the words haha sorry I tried my best .
7 0
3 years ago
(IMPORTANT PLEASE ANSWER)You are using a hose to fill up your backyard swimming pool on a hot day. Water flows out of the hose a
just olya [345]

Answer:

The independent variable is the m, which is the number of minutes the hose has been running. The dependent variable is the g, which is the gallons per minute.

Step-by-step explanation:

8 0
3 years ago
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The product of two positive integers us 2005. F neither integer is 1, what is the sum of the two integers?
Brums [2.3K]

Answer:

406

Step-by-step explanation:

Given: product of two positive integers us 2005.

Let the two positive integers be a and b

Now prime factorization of 2005 = 401×5

where both 401 and 5 are prime number and non of them is 1.

So, and b will be 401 and 5 respectively.

Therefore, sum of the two integers a+b = 401+5 = 406

8 0
2 years ago
54 is 90% of what number?
Zarrin [17]

The answer is 60 surprisingly

7 0
2 years ago
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