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3 years ago

Which of these expressions is equal to 6+(2+3)x5

Mathematics

2 answers:

Genrish500 [490]3 years ago

7 0

55 is correct 2+3=5, so 6+5 is 11*5=55

Bumek [7]3 years ago

3 0

<span>6+(2+3)x5 is equal to 31.
I'm not sure if x5 is *5 or x5</span>

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Can someone help me with this?

Anna35 [415]

Answer:

Let 'a' be the first term, 'r' be the common ratio and 'n' be the number of terms

Series = 2+6+18.......= 2+2•3¹+ 2•3².......= 728

Now,

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

So,

$\frac{a( {r}^{n} - 1)}{(r - 1)} = 728 \\ \frac{2( {3}^{n} - 1) }{(3 - 1)} = 728 \\ \frac{2( {3}^{n} - 1) }{2} = 728 \\ {3}^{n} - 1 = 728 \\ {3}^{n}=728+1\\ {3}^{n} = 729 \\ {3}^{n} = {3}^{6} \\ \boxed{ n = 6}$

Therefore, number of terms is 6

6 is the right answer.

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2 years ago

PLEASE HELP!!

Korvikt [17]

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2 years ago

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Find the inverse function of f(x)=4x-8

kipiarov [429]

Answer:

f^-1(x)=1/4x+2

Step-by-step explanation:

y=4x-8

change x and y

x=4y=8

switch sides

4y-8=x

add 8

4y=x+8

divide both sides by 4

y=1/4x+2

substitute f^-1(x) for y

f^-1(x)=1/4x+2

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2 years ago

Factorise this fully x^2+2x-15

natka813 [3]

The answer to the question

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3 years ago

A beverage company surveyed 450 adults to determine the demand for summer drinks.

nikklg [1K]

Answer:

Step-by-step explanation:

total number of people minus people who prefer soda, iced tea, or lemonade= people who prefer water

450-101-67-108=174

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2 years ago

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