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184023 Questions
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127
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math
the ratio of the lengths of stings that play thenotes f and g is 9 to 9. If a string 40 centimeters long plays a g, what is the lenght of the string that plays an F?
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Guest
Feb 13, 2020
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188
7
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A deck of cards has 5 pink, 2 gray, and 6 black cards. You pick 2 cards from the deck without replacement. What is the probability that the first card is gray and the second card is pink?
AnimalMaster
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Guest
Feb 13, 2020
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339
2
There are 175 baskets of fruit in the supermarket. 13 baskets of them are bananas. What percent of the baskets are not bananas?
There are 175 baskets of fruit in the supermarket. 13 baskets of them are bananas. What percent of the baskets are not bananas?
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Guest
Feb 13, 2020
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160
2
help
Peanuts sell for $3.00 per pound. Cashews sell for $6.00 per pound. How many pounds of cashews should be mixed with 12 pounds of peanuts to obtain a mixture that sells for $4.20 per pound?
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Guest
Feb 13, 2020
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141
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Let P(E) = 0.5, P(F) = 0.35, and P(F ∩ E) = 0.25. Draw a Venn diagram and find the conditional probabilities.
Let P(E) = 0.5, P(F) = 0.35, and P(F ∩ E) = 0.25. Draw a Venn diagram and find the conditional probabilities.
1) P(E | Fc )
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Guest
Feb 13, 2020
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152
0
help
Two points are selected randomly on a line of length L so as to be on opposite sides of the midpoint of the line. [In other words, the two points X and Y are independent random variables such that X is uniformly distributed over (0, L/2) and Y is uniformly
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Guest
Feb 13, 2020
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442
2
geometry proof
I'm unsure how to solve this, please help:
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Guest
Feb 13, 2020
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181
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help
A traffic light at a certain intersection is green 55% of the time, yellow 10% of the time, and red 35% of the time. A car approaches this intersection once each day. Let Y denote the number of days up to and including the third day on which a red light
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Guest
Feb 13, 2020
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196
2
help
The length of a rectangle is 12 centimeters less than its width. What are the dimensions of the rectangle if it’s area is 85 square centimeters?
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Guest
Feb 13, 2020
+1
482
2
+27
In a certain clothing store, 6 shirts and 3 ties cost $79.50, and 3 shirts and 2 ties cost $41. Determine the cost of each tie.
In a certain clothing store, 6 shirts and 3 ties cost $79.50, and 3 shirts and 2 ties cost $41. Determine the cost of each tie.
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veraguitars1234
Feb 13, 2020
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207
1
help
A blimp provides aerial television views of a baseball game. The television camera sights the stadium at a 7degrees angle of depression. The altitude of the blimp is 300m. What is the line-of-sight distance from the television camera to the base of the
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Guest
Feb 13, 2020
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638
6
Please help, I'm truly stuck and I'm sick
1) In triangle $WXY,$ $WX = 8$ and $XY = 14.$ The circumcircle of triangle $WXY$ is constructed. The tangent to the circumcircle at $X$ is drawn, and the line through $W$ parallel to this tangent intersects $\overline{XY}$ at $Z.$ Find $YZ.$
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Guest
Feb 13, 2020
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196
2
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Suppose that 80 percent of all statisticians are shy, whereas only 15 percent of all economists are shy. Suppose also that 90 percent of the people at a large gathering are economists and the other 10 percent are statisticians. If you meet a shy person
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Guest
Feb 13, 2020
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159
1
help
In 4 hours, an experienced cook prepares enough pies to supply a local restaurant's daily order. Another cook prepares the same number of pies in 7 hours. Together with a third cook, they prepare the pies in 2 hours. Find how long it takes the third
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Guest
Feb 13, 2020
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224
1
Help
A(−1, 1), B(2, 3), C(2, 1) 90∘ counterclockwise about vertex A
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Guest
Feb 13, 2020
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263
1
help
You survey 127 employees, and learn that the number one thing on their wish list is free coffee. If 100 employees drink on average 1.5 cups of coffee a day and the cost is $.40 per cup, how much will it cost the company to offer free coffee for the year
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Guest
Feb 13, 2020
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134
0
expected value problem
Three players enter a room and a red or blue hat is placed on each person's head. The color of each hat is determined by a coin toss, with the outcome of one coin toss having no effect on the others. Each person can see the other players' hats but not his
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Guest
Feb 13, 2020
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237
1
help
The distribution of SAT scores is normal with a mean of µ = 500 and a standard deviation of σ = 100. a. What SAT score (i.e., X score) separates the top 15% of the distribution from the rest?b. What SAT score (i.e., X score) separates the top 10% of the
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ElectricPavlov
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Guest
Feb 13, 2020
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191
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math
A kite forms a 25° angle with the ground. The wind picks it up so that it then forms a 74° angle with the ground
off-topic
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Guest
Feb 13, 2020
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213
1
help
A Can Complete a work in 12 days and B Can Complete in 8 days. A works for 8 hrs every day while works for 10 hours every day. If A and B together start wooking & his Perday, in how many days will they complete the work?
ElectricPavlov
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Guest
Feb 13, 2020
0
226
1
help
Jane is taking two courses. The probability she gets an A in the first course is 0.7. The probability she she gets an A in the second course is 0.8. The probability she gets an A in at least one of the courses is 0.9. What is the probability of passing
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Guest
Feb 13, 2020
+1
455
1
+313
Let n be a positive integer. (a) Prove that by counting the number of ordered triples (a, b, c) where in two different ways. (b) Prove that
Let n be a positive integer.
(a) Prove that
by counting the number of ordered triples (a, b, c) where in two different ways.
(b) Prove that
by counting the number of subsets of containing three different numbers
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mathmathj28
Feb 13, 2020
+1
233
3
+313
A stick is 5 inches long. It is broken at two points, chosen at random. What is the probability that all three pieces are longer than 1 inch
A stick is 5 inches long. It is broken at two points, chosen at random. What is the probability that all three pieces are longer than 1 inch?
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mathmathj28
Feb 13, 2020
+1
980
5
+313
Let triangle ABC be equilateral, where the side length is 3. A point D is chosen at random inside the triangle.
Let triangle ABC be equilateral, where the side length is 3. A point D is chosen at random inside the triangle. What is the probability that the length AD is at most 1?
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mathmathj28
Feb 13, 2020
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