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Rainbow [258]
3 years ago
5

21. Which fractions are NOT equivalent? À3/6=2/4 -B1/8=1/4 C1/3=2/6 D1/4=3/12

Mathematics
1 answer:
ryzh [129]3 years ago
5 0
<h3>Answer: Choice B) 1/8 and 1/4 are not equivalent</h3>

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

Explanation:

There are two ways to check to see if two fractions are equal.

---------

Method 1) Cross multiplication

3/6 = 2/4

3*4 = 6*2

12 = 12

The last equation is true, so the first equation is true. This shows 3/6 and 2/4 are the same fraction

1/8 = 1/4

1*4 = 8*1

4 = 8

The last equation is false, so 1/8 = 1/4 is false. We found our answer.

1/3 = 2/6

1*6 = 3*2

6 = 6

This equation is true. So we can move on

1/4 = 3/12

1*12 = 4*3

12 = 12

A similar story happens with A and C.

---------

Method 2) Comparing decimal forms

Using a calculator, we can find the decimal form of any fraction

3/6 = 0.5 and 2/4 = 0.5; since we get the same decimal value both times, this means 3/6 = 2/4 is a true statement. Choice A is ruled out.

1/8 = 0.125 and 1/4 = 0.25; we get different decimal values, so we can see that choice B is the answer

1/3 = 0.333.... (the 3s go on forever) and 2/6 = 0.333... we have the same story as choice A, so we can rule out choice C.

1/4 = 0.25 and 3/12 = 0.25, same story as A and C. We can rule out choice D.

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HELP PLEASE FAST!! ILL GIVE 5 STARS :))))
VMariaS [17]
Use substitution when either and x or y is given, for instance: x = 2y + 3 or y = 8x - 9.

Use elimination when a number from both equations can cancel each other out, for example:
2x + 3y = 19
-2x + 7y = 12

Hope this helps!
4 0
3 years ago
Read 2 more answers
(Will give brainliest) Is my answer correct?? If not please correct me
Yuki888 [10]

Hey!

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

Answer:

(-6, 2) and (-7, -1) and (0, 0)

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

Explanation:

You reflected the triangle. You needed to translate the triangle.

y + 6 is to move up 6 units along the y-axis.

x - 5 is to move left 5 units along the x-axis.

Another thing, the question doesn't state was transformation to use so we are going to assume we are translating.

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

Hope This Helped! Good Luck!

5 0
3 years ago
When Noah goes bowling, his scores are normally distributed with a mean of 150 and a standard deviation of 12. What is the proba
Zarrin [17]

Answer:

The probability of his score being between 135 and 167 is 0.8151 or (0.8151*100=81.51%)

Step-by-step explanation:

Given that:

Mean = μ = 150

SD = σ = 12

Let x1 be the first data point and x2 the second data point

We have to find the z-scores for both data points

x1 = 135

x2 = 167

So,

z_1 = \frac{x_1-mean}{SD}\\= \frac{135-150}{12}\\=\frac{-15}{12}\\=-1.25

And

z_2 = \frac{x_2-mean}{SD}\\z_2 =\frac{167-150}{12}\\=\frac{17}{12}\\= {1.416}

We have to find area to the left of both points then their difference to find the probability.

So,

Area to the left of z1 = 0.1056

Area to the left of z2 = 0.9207

Probability to score between 135 and 167 = z2-z1 = 0.9027-0.1056 = 0.8151

Hence,

The probability of his score being between 135 and 167 is 0.8151 or (0.8151*100=81.51%)

3 0
3 years ago
Work out the formula for the nth term of the<br>quadratic sequence:<br>5, 11, 19, 29​
Sladkaya [172]

Answer:

n squared + 3n + 1

Step-by-step explanation:

5,11,19,29

Firstly look at the difference between each number. The first difference is 6 then 8 then 10 etc. After that you look at your created sequence - 6,8,10 etc. The difference is 2 each time. Then applying rules, you have to do the constant difference divided by 2 to get a coefficient of n squared. So in this case it's n squared because 2/2 = 1 so you don't have to place a 1 in front of the n squared. After you create a sequence from the n squared. That would be 1,4,9 etc. Then you need to see how to get from the sequence: 1,4,9 etc to your original sequence: 5,11,19 etc. So if you calculate it you will get 4,7,10 because firstly 5-1 = 4 then 11-4 = 7 etc. The sequence 4,7,10 is a linear sequence so the constant difference is 3 each time. So to get a nth term of a linear sequence you will start off as 3n then you will substitute 1 then 2 then 3 into the 3n. Therefore that would be 3,6 etc. So if you take the first substituted term, that would be 3 as said before then you will have to see how to get from the 3 to 4 so that is just adding 1. So the nth term of this linear sequence is 3n + 1. Check if it works at the end. So the overall nth term of the quadratic sequence is n squared as said before + 3n + 1.

8 0
3 years ago
Lena is asked to write an explicit formula for the graphed geometric sequence (3,6.25) (2,2.5) (1,1)
harkovskaia [24]
The correct answer for this question is this one: "2.5"
Lena is asked to write an explicit formula for the graphed geometric sequence. The value, written as a decimal, should Lena use as the common ratio that is 2.5There exists the same question from other source with the image is shown.
Hope this helps answer your question and have a nice day ahead.
3 0
3 years ago
Read 2 more answers
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