15x+3y=9. 10x+7y=-4 sysyem of

1 answer:

7 0

You have to put the problems on top of each other. Then choose whether you want to isolate x or y. (I would say try it with x that is easier) If you multiply the (15x+3y=9) all by -2. Then you write the answers there. Then place 10x+7y=-4 underneath leaving that the same. Cross out the x currently and solve for y as you would normally. Plug in the y once you figure it out and then solve for x. Then check your answer.

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14. Suppose that 1 out of every 10,000 doctors in a certain region is infected with the SARS virus; in the same region, 20 out o

hram777 [196]

Answer:

The person in the at-risk population is much more likely to actually have the disease

Step-by-step explanation:

The probability of a randomly selected doctor having the disease is 1 in 1,000 (P(I)=0.0001).

The probability that a doctor is infected with SARS, given that they tested positive is:

$P(I|+)=\frac{P(I)*0.99}{P(I)*0.99+(1-P(I))*0.01}\\P(I|+)=\frac{0.0001*0.99}{0.0001*0.99+(1-0.0001)*0.01}\\P(I|+)=9.9*10^{-3}$