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choli [55]
3 years ago
9

What do we use to represent a value that we don't know?

Mathematics
1 answer:
Xelga [282]3 years ago
3 0

Answer:

<em>we </em><em>use </em><em> </em><em><u>variable</u></em><em> </em><em>to </em><em>represent</em><em> </em><em>a </em><em>value</em><em> </em><em>that</em><em> </em><em>we </em><em>don't</em><em> </em><em>know</em>

e.g

a,b,c,x,y,etc.

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Which pair represents equivalent ratios? A Begin fraction . . . 2 over 3 . . . end fraction . . . and . . . begin fraction . . .
Blizzard [7]

Equivalent ratios are those ratios which are same that is on simplifying each of them, we will get the same answer.

A.\frac{2}{3} and \frac{9}{15} = \frac{3}{5}

So they are not equivalent

B.\frac{5}{8} and \frac{15}{21} = \frac{5}{7}

So they are not equivalent

C.\frac{3}{12} and \frac{6}{18} = \frac{1}{4} and \frac{1}{3}

They are not equivalent too.

D.\frac{4}{10} and \frac{12}{30} = \frac{2}{5} and \frac{2}{5}

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5 0
4 years ago
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shutvik [7]

Answer:

You need to use appropriate formula for the surface area. You may find formula in your mathematics book.

8 0
3 years ago
Two chemical companies can supply a raw material. The concentration of a particular element in this material is important. The m
svp [43]

Answer:

As the calculated F lies in the acceptance region therefore we conclude that there is not sufficient evidence to support the claim that the variability in concentration may differ for the two companies. Hence Ha is rejected and H0 is accepted.

Step-by-step explanation:

As we suspect the variability of concentration F - test is applied.

n1=10    s1=4.7

n2=16      s2=5.8

And α = 0.05.

The null and alternate hypothesis are

H0: σ₁²=σ₂²       Ha:  σ₁²≠σ₂²

The null hypothesis is  the variability in concentration does not  differ for the two companies.

against the claim

the variability in concentration may differ for the two companies

The critical region F∝(υ1,υ2) = F(0.025)9,15= 3.12

and 1/F∝(υ1,υ2) = 1/3.77= 0.26533

where υ1= n1-1= 10-1= 9 and υ2= n2-1= 16-1= 15

Test Statistic

F = s₁²/s₂²

F= 4.7²/5.8²=0.6566

Conclusion :

As the calculated F lies in the acceptance region therefore we conclude that there is not sufficient evidence to support the claim that the variability in concentration may differ for the two companies. Hence Ha is rejected and H0 is accepted.

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3 years ago
HELP!! correct answer gets brainliest
Llana [10]

Answer:

1/3 I think I did the math and if that's not right try 1/3:1/4 (<--ratio)

Step-by-step explanation:

3 0
3 years ago
The hypotenuse of a right triangle is 7 inches, and one of the legs is square root 13 inches. Find the length of the other leg.
Rashid [163]
The answer is A) 6 inches.
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3 years ago
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