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230631 Questions
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+21
Math. PLEASE HELP ME
A jar has 10 blue marbles and 8 red marbles. If five marbles are chosen at random from the jar, what is the probability that three of them are blue and two are red? (To two decimal places).
Here you are choosing without replacement: you
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marydien
Dec 2, 2019
0
447
3
help
A bag contains five white balls and five black balls. Your goal is to draw two black balls.
You draw two balls at random. Once you have drawn two balls, you put back any white balls, and redraw so that you again have two drawn balls. What is the probability
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Guest
Dec 2, 2019
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399
3
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I have a collection of sixteen cards. Each card is rose, amber, emerald, or liberty (a shade of blue) . Also, each card is labelled A, B, C, or D. There is a card for each color-letter combination, e.g. there is an amber card that has a B on it.
These
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Guest
Dec 2, 2019
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531
18
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Two squares of an 8 by 8 chessboard are chosen at random. What is the probability that they are adjacent (vertically or horizontally, but not diagonally)?
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Guest
Dec 2, 2019
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508
1
help
A number from 100 to 999, inclusive, is chosen at random. What is the probability the number contains a digit of 0?
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Guest
Dec 2, 2019
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364
0
help
There is a 2/3 probability that it will rain on any particular day. What is the probability that it will rain this weekend (Saturday or Sunday)?
Guest
Dec 2, 2019
0
584
1
help
How many terms are in the expansion of (a + b + c + d)^5?
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Guest
Dec 2, 2019
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393
1
help
Determine the sum of all positive integers n less than 2019 such that the number 3n^3 + 2n^2 + n gives a remainder of 3 when divided by 49.
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Guest
Dec 2, 2019
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320
0
help
Suppose that x^2 + 2x - 4 = 0. Find x^4 + 4x^3 + 4x^2 + 3.
Guest
Dec 2, 2019
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475
2
help
Solve |2x + 1| = |4x + 3|.
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Guest
Dec 2, 2019
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510
1
help
If one root of (a^2 + 9)x^2 + 13x + 6a = 0 is equal to the reciprocal of the other root, then find a.
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Guest
Dec 2, 2019
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637
1
help
Circle A and circle B are concentric. A chord of circle A that is tangent to circle B has a length that is twice the radius of circle B. What is the ratio of the area of circle A to the area circle B?
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Guest
Dec 2, 2019
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897
1
help
An ice cream shop offers 6 kinds of ice cream. What is the greatest number of two scoop sundaes that can be made such that each sundae contains two types of ice cream and no two sundaes are the same combination?
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Guest
Dec 2, 2019
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766
2
+21
Math
Mary commutes to work. On light traffic days it takes her only 15 minutes. On moderate days it takes 25 minutes and on heavy traffic days, it takes her 60 minutes. Only about 10% of the days are heavy traffic and 20% of the days the traffic is light. On
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marydien
Dec 2, 2019
0
553
1
help
You are on a game show, being asked to choose between three doors. Behind each door, there is either a car or a goat. You choose a door. The host picks one of the other doors, which he knows has a goat behind it, and opens it, showing you the goat.
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Guest
Dec 2, 2019
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513
1
help
Three numbers are chosen at random from the set {1, 2, 3, ..., 9}. Find the probability that they add up to 20.
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Guest
Dec 2, 2019
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557
1
help
If a + b = 2 and a^3 + b^3 = 14, then find all possible values of a^2 + b^2.
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Guest
Dec 2, 2019
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