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padilas [110]
3 years ago
9

What is -2/9 as a decimal?

Mathematics
2 answers:
Vanyuwa [196]3 years ago
8 0
-2.9 it would be -2.9
lawyer [7]3 years ago
6 0
-0.2222222 (repeating)<span />
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Please help with question #3!
Dmitry [639]

Answer:

  e.  1/(49n² +7n)

Step-by-step explanation:

\dfrac{(7n-1)!}{(7n+1)!}=\dfrac{(7n-1)!}{(7n+1)(7n)(7n-1)!}=\dfrac{1}{(7n+1)(7n)}\\\\=\dfrac{1}{49n^2+7n}

5 0
3 years ago
Solve for x. Please help
Feliz [49]

Answer:

<u><em>x = 37/45</em></u>

Step-by-step explanation:

Here's how similar triangles work. We set up an equation as SIDE 1A/ SIDE 1B = SIDE 2A/ SIDE 2B

Ok, so these 2 triangles are similar, so we can set up a butterfly equation:

Side 1a would be 8x

Side 1b would be 5x +3

Side 2a would be 10x - 2

Side 2b would be 7x

----------------------------------------------------

Our equation would be

8x/(5x+3) = (10x-2)/7x

We cross multiply to get 8x(10x-2) = 7x(5x+3)

Instead of solving and getting squares, we can x on both sides and we get:

8(10x - 2) = 7(5x+3) ----> we simplify to get

80x - 16 = 35x + 21 ----> it's easy sailing from here.

45x = 37

<u><em>x = 37/45</em></u>

<u><em>gosh i hope it's right...</em></u>

4 0
3 years ago
The sum of three times a number
Zepler [3.9K]

Answer:

Step-by-step explanation:

1x3=3

2x3=6

3x3=9

8 0
3 years ago
Please give me a long answer! Thank you!
xxTIMURxx [149]

Answer:

10/12 can be approximated by 1

3/8 can be approximated by 1/2

so the answer to the subtraction must be really close to 1-1/2 = 1/2 = 0.5

Step-by-step explanation:

The real solution can be found by converting to numerator 24, which is the LCM, or Lowest Common Multiple of numerators 12 and 8.

10/12 = 20/24

3/8 = 9/24

Now the subtraction is (20-9)/24 = 11/24 ≈ 0.4583

So the actual result 0.4583 is actually pretty close to 0.5.

A benchmark value is nothing more than a really simple fraction or integer (1/2,  1/3, 1, 2, ...) that you know where to plot on the number line.

Making approximations can serve as a double check to see if you didn't make any mistakes on the actual calculation.

6 0
3 years ago
Which expression represents the area of a circle with a radius of 7 units ?
Neporo4naja [7]

Answer:

B)7∙7∙π

Step-by-step explanation:

the area of a circle A=πr^2

the r^2 turns into 7*7 and you keep the pi

so it would be 7*7*pi

7 0
3 years ago
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