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Vsevolod [243]
3 years ago
15

Solve 4(2a-1) = -10(a-5)

Mathematics
2 answers:
densk [106]3 years ago
4 0
Firstly, you've got to expand the brackets, this becomes;
8a-4= -10a+ 50
You've then got to eliminate the -10a and you do this by adding 10a to both sides,
This then becomes 18a-4=50
You've then got to add 4, to eliminate this, which then becomes 18a=54
You've then got to divide both sides by 18, and this becomes 3.
Therefor, a=3
Hope this helps :)
never [62]3 years ago
4 0
8a-4=-10a+50
+10a   +10a \\ 18a-4=50 \\ +4 +4 \\ 18a=54 \\ /18 /18 \\ a=3

Hope this helps :)

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An electrical engineer wishes to compare the mean lifetimes of two types of transistors in an application involving high-tempera
Olin [163]

Answer:

(115.2642, 222.7358).

Step-by-step explanation:

Given data:

type A: n_1=60, xbar_1=1827, s_1=168

type B: n_2=180, xbar_2=1658, s_2=225

n_1 = sample size 1, n_2= sample size 2

xbar_1, xbar_2 are mean life of sample 1 and 2 respectively. Similarly, s_1 and s_2 are standard deviation of 1,2.

a=0.05, |Z(0.025)|=1.96 (from the  standard normal table)

So 95% CI is

(xbar_1 -xbar_2) ± Z×√[s1^2/n1 + s2^2/n2]

=(1827-1658) ± 1.96×sqrt(168^2/60 + 225^2/180)

= (115.2642, 222.7358).

8 0
3 years ago
A survey of
Zina [86]

Answer:

0.0208<p<0.0592

Step-by-step explanation:

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-The confidence interval can be determined as follows:

CI=\hat p\pm z\sqrt{\frac{\hat p(1-\hat p}{n}}\\\\\hat p=x/n=16/400=0.04

#We the use this proportion to find the CI at 95%:

CI=0.04\pm 1.96\times \sqrt{\frac{0.04(1-0.04)}{400}}\\\\=0.04\pm 0.0192\\\\=[0.0208,0.0592]

Hence, the 95% confidence interval is 0.0208<p<0.0592

7 0
3 years ago
Pls help me show work too:(
fredd [130]
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4 0
3 years ago
What is the value of y
trapecia [35]

Answer:

Here,\\Since~BC║DE,\\

[Corresponding Sides of similar triangles are proportional.]

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4 0
3 years ago
In the past year and a half, Gnarly the dog lost an average of 29pound each month. Today, Gnarly weighs 14 pounds. How much did
tatyana61 [14]

Answer:

449pounds

Step-by-step explanation:

29x15months=435

435+15=449 pounds

P.S. That was one BIG dog.

7 0
3 years ago
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