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3 years ago

Which series has a sum of 20?

Mathematics

1 answer:

alexandr402 [8]3 years ago

5 0

Answer:

see below

Step-by-step explanation:

The sum of an infinite series with first term "a" and common ratio "r" is ...

S = a/(1 -r) . . . . . for |r| < 1

Then the sums for the given answer choices are ...

A: 5/(1 -3/4) = 20 . . . . . the answer of choice

B: 4/(1 -5/6) = 24

C: 4/(1 -1/5) = 5

D: 10/(1 -1/5) = 12.5

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Express the recurring decimal 0.042 as a fraction in its simplest form.

rodikova [14]

Answer:

7/165

Step-by-step explanation:

This is a mixed recurring decimal (the zero is not repeating)

We take number after the decimal point 042

then we subtract the non repeating.In this case is 0 so we not subtract anything

This will be the numerator 42

Now ,the denominator:

For each repeating decimal we write a 9 (in this case 2 nines)

For each non repeating decimal we write a zero

Denominator is 990

42/990 = 7/165

7:165 = 0.0424242......

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3 years ago

Giải phương trình y'=0 biết:y=x^4

Mila [183]

Answer:

Step-by-step explanation:

1) y'=(x⁴)'=4x³;

2) ∡ y'=0, ⇒ 4x³=0; ⇒ x=0.

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2 years ago

Please answer!!!!!!!!!!!!!!

bija089 [108]

Answer:

It is either 2 or 4, I think it might 2, kind of hard to tell. Sorry if neither of my educative guesses are correct.

Step-by-step explanation:

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2 years ago

HELP PLEASE!!! Find an equation of a line through (√3,12) parallel to the line:

amm1812

Answer:

just put like what oh yea put 72

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2 years ago

Let C = total cost, and t = number of t-shirts. Using the following equation C = 4t + 160, how much will it cost for 30 t-shirts

Semenov [28]

Answer:

$280

Step-by-step explanation:

4(30)+160

120+160

280

7 0

3 years ago

Read 2 more answers