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jeka57 [31]
3 years ago
7

Explain your answer !! Will give brainlst

Mathematics
1 answer:
Olegator [25]3 years ago
5 0

Answer:

x=-17

y=-2 2/3

Step-by-step explanation:

start with the second one and do substitution

x -6y=-1 add the -6y over to get x alone

x=6y-1 put this into first equation

2(6y-1)-15y=6 distribute

12y-2-15y=6 add like terms

-3y-2=6 add the -2 over

-3y=8 divide by -3

y=-2 2/3 put this back into the first equation that was solved for x

x=6(-2 2/3)-1 distribute

x=-17

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timurjin [86]
I hope this helps you

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If someone drove 15 miles and is only three fifths of their way home what is the total length of her drive
BabaBlast [244]
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The amount of time it takes to see a doctor a CPT-Memorial is normally distributed with a mean of 33 minutes and a standard devi
Eva8 [605]

Answer:

a) <em>Z-score = 0.75</em>

b) <em>Z-score = -32.833</em>

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given that mean of the Population = 33

Given a standard deviation of the Population = 12

Let 'X' be a random variable in a normal distribution

Let 'X' = 42

<u><em>Step(ii):-</em></u>

<em>      </em>Z = \frac{x-mean}{S.D}<em></em>

<em>     </em>Z = \frac{42-33}{12} = 0.75<em></em>

<u><em>Step(iii):-</em></u>

<em>Given that mean of the Population = 89</em>

Given a standard deviation of the Population = 1

Let 'X' be a random variable in a normal distribution

Let 'X⁻ = 82

<em>   </em>Z = \frac{x^{-} -mean}{\frac{S.D}{\sqrt{n} } }<em></em>

<em>     </em>Z = \frac{82-89}{\frac{1}{\sqrt{22} } } =  -32.833<em></em>

<em>Z-score = -32.833</em>

<em></em>

7 0
3 years ago
The life expectancy of a circulating coin is 30 years. The life expectancy of a circulating dollar bill is only
Afina-wow [57]
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life expectancy of coin = c

d = 1/20 c

substitute value in for c (30)

d = 1/20 * 30
d = 30/20
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life expectancy of a dollar bill = 1.5 years
3 0
3 years ago
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