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229306 Questions
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358
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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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1017
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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573
1
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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600
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
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737
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
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1481
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+306
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
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651
3
+306
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
2743
5
+306
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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1761
2
help
A utility pole is supported by two wires, one on each side, going in the opposite direction. The two wires form a 75-degree angle at the utility pole. if the wires are 12 meters and 16 meters long and secured to the ground, find the distance between the
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Guest
Feb 13, 2020
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822
4
+304
Scratch the Polynomial help. I figured it out!!!
I contacted my friend, (USJMO) competitor, he taught me using modulos and figured it out. Thank you guys for all your help :D
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DragonLord
Feb 13, 2020
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680
4
+1992
Hi! I need some help with these 2 questions. thank you in advance.
Hi! I need some help with these 2 questions. thank you in advance.
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jjennylove
Feb 13, 2020
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980
4
help please
A pot contains 6 L of brine at a concentration of 110 g/L. How much of the water should be boiled off to increase the concentration to 200 g/L?
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Guest
Feb 13, 2020
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980
3
+1485
Amazing Math
Can someone explain this: sqrt( 50 ) = 10 * sine or cosine of 45°
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Dragan
Feb 13, 2020
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1079
3
DESPERATELY NEED HELP ASAP!
The grid lines in the graph below are one unit apart. The red parabola shown is the graph of the equation y=ax^2+bx+c. Find a+b+c. NOTE: the answer isn’t -3.
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Guest
Feb 13, 2020
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490
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help
A plane intersects a prism to form a cross section that is a polygon with five sides. What is the minimum number of sides that the polygon at the base of the prism must have?
Guest
Feb 13, 2020
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3887
8
+1007
There are $18$ chairs numbered from $1$ through $18$ around a circular table. How many ways can three people be seated, so that no two peopl
There are chairs numbered from 1 through 18 around a circular table. How many ways can three people be seated, so that no two people are adjacent?
Alright, the answer is 3276. Without any restrictions, there a total of
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hugomimihu
Feb 13, 2020
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1
912
2
help
Five cards are dealt from a standard 52-card deck.
(a) What is the probability that we draw 1 ace, 1 two, 1 three, 1 four, and 1 five (this is one way to get a "straight")?
(b) What is the probability that we draw any straight (including
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Guest
Feb 13, 2020
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991
5
help
One leg of a right triangle measures 3 cm. The hypotenuse of the right triangle measures 3 cm less then twice the length of the unknown leg. Find the measure of all of the sides of the triangle.
CalculatorUser
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Guest
Feb 13, 2020
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648
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Size of a field
Following the bounary of a rectangular field, it requires 11 rounds of a lawn mower to cut 1/2 of it and 14 more to cut the remainder. If the lawn mower cuts a swath 2 feet wide and all swaths are full, what are the dimensions of the field. Thank you for
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Guest
Feb 13, 2020
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681
5
help please
Compute the unique positive integer $n$ such that
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Guest
Feb 13, 2020
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371
2
help
Determine
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Guest
Feb 13, 2020
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2080
4
+296
I think someone should fully answer 'DragonLords' questions.
Let be a nonconstant polynomial, where all the coefficients are nonnegative integers. Prove that there exist infinitely many positive integers such that is composite.
I can prove it for all cases that
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EpicWater
Feb 13, 2020
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441
1
Algebra problem----Please help
Let f(x) = 2x + 7 and g(x) = 3x + c. Find c if for all x.
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Guest
Feb 13, 2020
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