Wednesday
December 11, 2013

# Posts by Joanna

Total # Posts: 118

probabilities
I got 4/5 but the answer in the book says something else. Am I correct?

probabilities
but Reiny it's WITH replacement!

probabilities
A bag contains 3 green balls. 2 red balls and a white ball. A boy randomly draws balls from the bag one at a time (with replacement) until a red ball appears. Find the probability that he will make at least 3 draws.

math
If there are only two possible outcomes from each trial then it's a binomial and by using the formula nCx p^x(1-p)^(n-x) we get; 5C4(1/3)^4(2/3)^1=0.04115

Algebra
let X be the amount she had in the beginning. x-2 after magazine On shoes she spent: (x-2)/2. For lunch she spent: (x-2)/4. She is left with (x-2)/4=12 <=> x-2=48<=> x=\$50

math

math
I have answered this question for Anderw

physics
A curve of radius 20 m is banked so that a 970 kg car traveling at 50 km/h can round it even if the road is so icy that the coeﬃcient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s^2 Find the minimum speed at which a car can travel aro...

Science
What happens when 1 Liter of Carbon Tetrachloride is poured into a container of Water?

Chemistry
the mass in grams 6.02x10^24 atoms Bi and 1.50x10^15 atoms U

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