How do I do this? (1 Viewer)

[manifestation]

Need Help again!!!

How do I do this??

The answer is C, but i don't know how to get it

Thanks lovely's!

- Mani

 

[word.]

well i've never heard of this before but:

P(1st) = 1/200 * $100 = 50c
P(2nd) = 1/199 * $50 approx = 25c

soo, 75c is her "financial expectation"
but she spent 1 dollar so she loses 25c

 

[Jayphen]

Yeah, for financial expectation, you find the probability for each event, mulitply them by their financial outcome, and add the solutions together

 

[manifestation]

Thanks!!! Champions!

 

[ameh]

Hey Hera!


*waves*

 

[manifestation]

Hey Hera!


*waves*

Hello...sorry who is this??

I have another question...i don't know how to do this one either!!!

- Thanks

 

[ameh]

Amy,


Good Luck w. exams!

 

[manifestation]

Amy,


Good Luck w. exams!

Thanks love And Good Luck to you too!!

 

[Peartie]

Dont know if its to late BUT

40 = k x 60^2
40/60^2 = k
k = 0.0111.... = 1/90

80 = 1/90 x s^2
80/0.011... = s^2
s^2 = 7200
s = 84.8...
Therefore s = C (85 Km/h (nearest km/h)

Hope it helped

good luck all

 

[Jayphen]

Hello...sorry who is this??

I have another question...i don't know how to do this one either!!!

- Thanks

For proportional questions like this one, change it so that it is in the form X = k x Y

The thing that is referred to in the question as "proportional to" is X, and the other number is Y

So stopping distance is "proportional to". X = 40m

40 = k x 60^2
40/60^2 = k
1/90 = k

Now you've found out k, so you can substitute it into the original equation X = k x Y, replacing the values with what the question is asking (in this case, it is telling you that the stopping distance is 80m, so substitude that in where X is)

(btw 1/90 = 0.11)

80 = 0.11 x Y^2
80/0.11 = Y^2
7200 = Y^2
Y = 84.8528..
Y = 85km/h
Answer is C!


I know someone already answered this, but answering questions really helps me remember myself

 

[elisabeth]

Or a less confusing looking way...

60 squared : 40 m
--> 3600 : 40m
--> 7200 : 80m
--> root 7200 : 80m

= 84.85....
= 85 km/hr

 

[manifestation]

Thanks guys!! GOOD LUCK!!