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Vinvika [58]
2 years ago
13

The sum of the equations -8x - 2y = 54 and 4x + 10y = 10 is an equation in one variable.

Mathematics
1 answer:
allochka39001 [22]2 years ago
5 0
Multiplying first equation by .5:
A) -4x -y = 27   then adding equation B)
B) 4x + 10y = 10
9y = 37
y = <span> <span> <span> 4.1111111111 </span> </span> </span>

x =
-4x - <span> <span> <span> 4.1111111111 </span> </span> </span> = 27
-4x = <span>31.1111111111
x = </span> <span> <span> <span> -7.7777777778 </span> </span> </span>


<span><span> </span> </span>


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Answer:

<u>Question 1:</u>

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<u />

<u>Question 2:</u>

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Step-by-step explanation:

<u>Question 1:</u>

x = no. of mg of porphyrin per deciliter of blood.

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(a) We need to compute P(x<60). We need to find the z-score using the normal distribution formula:

z = (x - μ)/σ

P(x<60) = P((x - μ)/σ < (60 - 40)/14)

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                        = P(-1.71 < z < 1.43)

This probability can be calculated as: P(z<1.43) - P(z<-1.71)

                                         P(16<x<60) = 0.9236 - 0.0436

                                         P(16<x<60) = 0.88

(d) P(x>60) = 1 - P(x<60)

     we have calculated P(x<60) in part (a) so,

    P(x>60) = 1 - 0.9236

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<u>Question 2:</u>                              

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    P(3<x<7) = 0.9938 - 0.0668

    P(3<x<7) = 0.927

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