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4 years ago

Solve by substitution x+3y=72x-4y=24

Mathematics

2 answers:

7nadin3 [17]4 years ago

7 0

X=10
y=-1
...................................................................

Triss [41]4 years ago

6 0

Frm Equation 1, X+3y=7, Make Y D Subject Of The Formula, Then Y=7-x/3(eqn 3), Insert Eqn3 In Eqn 2, 2x-4(7-x/3)=24, Multiply Throughout By 3, 6x-4(7-x)=24, 6x-28+4x=72, Collect The Like Term, 10x=100, Divide Both Sides By 10, X=10. Substitute X=10 In Eqn 3, Y=7-x/3, Y=7-(10)/3, Y=7-10/3, Y=-3/3, Y=-1. X=10, Y=-1

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Answer:

324

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3 years ago

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2 years ago

Please someone help What is the volume

Kazeer [188]

Answer:

7 because 24-10=4+3=7

Step-by-step explanation:

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4 years ago

In order to estimate the average time spent on the computer terminals per student at a local university, data were collected fro

VladimirAG [237]

Answer:

Margin of error for a 95% of confidence intervals is 0.261

Step-by-step explanation:

Step1:-

Sample n = 81 business students over a one-week period.

Given the population standard deviation is 1.2 hours

Confidence level of significance = 0.95

Zₐ = 1.96

Margin of error (M.E) = $\frac{Z_{\alpha }S.D }{\sqrt{n} }$

Given n=81 , σ =1.2 and Zₐ = 1.96

Step2:-

 $Margin of error (M.E) = \frac{Z_{\alpha }S.D }{\sqrt{n} }$ 

 $Margin of error (M.E) = \frac{1.96(1.2) }{\sqrt{81} }$ 

On calculating , we get

Margin of error = 0.261

Conclusion:-

Margin of error for a 95% of confidence intervals is 0.261

4 0

4 years ago

Answer to this question please

fredd [130]

Answer:

Volume is 21

Explanation

Base length is 4.5

Widgth is 3.5

and height is 4 (I can't tell if its 2 because picture is blurry)

V=lwh/3=4.5·3.5·4= 21

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3 years ago