They will have the same solution because the first equation of system b is obtained by adding the first equation of system a to 4 times the second equation of system a.

5 0

3 years ago

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2(4y-5)=70<br><br>how u do this

steposvetlana [31]

Answer:

Step-by-step explanation:

First you distribute so two times 4Y is 6Y then you multiply the two in the five which gives you 2Y -5 equals 70

3 0

3 years ago

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Please help me!<br><br> Decrease £40 by 10%

Alekssandra [29.7K]

Answer:

Step-by-step explanation:

40 * .10 = 4

40-4 = 36

6 0

2 years ago

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Announcements for 84 upcoming engineering conferences were randomly picked from a stack of IEEE Spectrum magazines. The mean len

Marina86 [1]

Answer:

Step-by-step explanation:

Hello!

You need to construct a 95% CI for the population mean of the length of engineering conferences.

The variable has a normal distribution.

The information given is:

n= 84

x[bar]= 3.94

δ= 1.28

The formula for the Confidence interval is:

x[bar]± $Z_{1-\alpha/2}$ *(δ/n)

Lower bound(Lb): 3.698

Upper bound(Ub): 4.182

Error bound: (Ub - Lb)/2 = (4.182-3.698)/2 = 0.242

I hope it helps!

6 0

3 years ago

John bought 27.5 m of cloth. How many centimetres of cloth did he buy ?​

John bought 27.5 m of cloth. How many centimetres of cloth did he buy ?