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bearhunter [10]
3 years ago
6

If I think of a number halve it and subtract 2 results is 10.write equations and solve it please

Mathematics
2 answers:
gayaneshka [121]3 years ago
6 0

Answer:

24

Step-by-step explanation:

let 'x' = number

x/2 - 2 = 10

add 2 to each side to get:

x/2 = 12

cross-multiply to get:

x = 24

grin007 [14]3 years ago
5 0

Answer:

  • The equation is (x/2) - 2 = 10
  • The equation solves to x = 24

============================================================

Explanation:

x = the number you think of

x/2 = the result after taking half of that number

(x/2) - 2 = subtract 2 from the previous result

(x/2) - 2 = 10 is the equation to solve

Solving said equation gets us...

(x/2) - 2 = 10

x/2 = 10+2 ... adding 2 to both sides

x/2 = 12

x = 12*2 ..... multiplying both sides by 2

x = 24

Notice how we basically undo everything applied to x. First we divided by 2, then we subtracted 2. So we follow that order in reverse to undo the "minus 2" (ie add 2 to both sides). Then we undo the division to multiply both sides by 2 to end up with the answer x = 24

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

Let's check that answer:

x = 24

x/2 = 24/2 = 12 ... result after taking half of x

(x/2) - 2 = (12)-2 = 10 ... result after subtracting two

We end up with 10 as your teacher mentioned, so it confirms that x = 24 is the answer.

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

Here's another way to check:

(x/2) - 2 = 10

(24/2) - 2 = 10

(12) - 2 = 10

10 = 10

We end up with the same thing on both sides, so x = 24 is confirmed.

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The mean percentange of a population of people eating out at least once a week is 57℅
Sidana [21]

Answer:

<u>The correct answer is B. between 56.45% and 57.55% </u>

Complete statement and question:

The mean percentage of a population of people eating out at least once a week is 57% with a standard deviation of 3.50%. Assume that a sample size of 40 people was surveyed from the population a significant number of times. In which interval will 68% of the sample means occur?

between 55.89% and 58.11%

between 56.45% and 57.55%

between 56.54% and 57.46%

between 56.07% and 57.93%

Source: brainly.com/question/1068489

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Mean percentage of a population of people eating out at least once a week  = 57%

Standard deviation = 3.5%

Sample size = 40

Confidence level = 68%

2. In which interval will 68% of the sample means occur?

For answering this question, we should find out the standard deviation of the sample, using this formula:

Standard deviation of the sample = Standard deviation of the population/√Sample size

Standard deviation of the sample = 3.5/√40

Standard deviation of the sample = 3.5/6.32

Standard deviation of the sample = 0.55

Let's recall that a confidence level of 68% means that 68% of the sample data would have a value between the mean - 1 time the standard deviation of the sample and the mean  + 1 time the standard deviation of the sample. Thus:

57 - 1 * 0.55 = 57 - 0.55 = 56.45

57 + 1  * 0.55 = 57 + 0.55 = 57.55

<u>The correct answer is B. between 56.45% and 57.55% </u>

7 0
3 years ago
Whats the best answer for this ???
Romashka-Z-Leto [24]
Just simplify the given equation
y = 7.2 + 4(x-2)
y = 7.2 + 4x - 8
y = 4x - 0.8

Now they want to know the answer if X = 2
y = 4(2) - 0.8
y = 8 - 0.8
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Stella works for a company that makes aluminum cans. A large soup can have a radius of 8 centimeters and a height of 20 centimet
4vir4ik [10]
Could possibly be 36
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3 years ago
What is 965,000,000,000,000 in scientific notation?
bogdanovich [222]
<h3><u>QUES</u><u>TION</u><u>:</u></h3>

What is 965,000,000,000,000 in scientific notation?

9.65×10−14

9.65×10−12

9.65×1012

9.65×1014

<h3><u>ANSWER</u><u>:</u></h3>

\large \sf \orange{9.65 \times 10 {}^{14} } \sf \: is \: the \: scientific \: notation \: of \: 965000000000000

<u>Addit</u><u>ional</u><u> </u><u>info</u><u>:</u><u> </u>Remember that SCIENTIFIC NOTATION is in the form a × 10^b where 1 ≤ a < 10 and b is an integer.

HOPE THIS HELP YOU! HAVE A NICE DAY

~kimtaetae92~

5 0
2 years ago
3^2x5^2x2x5^35^5 please help​
const2013 [10]

Answer:

  2×3^2×5^10

Step-by-step explanation:

We presume you want the simplified product ...

  3^2×5^2×2×5^3×5^5

The applicable rule of exponents is ...

  (a^b)(a^c) = a^(b+c)

The bases are 2, 3, 5. The exponent of 2 is 1; the exponent of 3 is 2; the exponents of 5 are 2, 3, 5, so those get added.

 = 2×3^2×5^(2+3+5)

  = 2×3^2×5^10

_____

  = 175,781,250

3 0
2 years ago
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