unowen
Popular questions and responses by unowen
physics
Robin Hood has to shoot an arrow at an apple that sits on a wall 400 meters away, at a height of 40 meters. He must shoot at an angle of 60 degrees. What must the initial velocity of the arrow be to hit the target? Assume he's shooting laying down on the
asked on July 8, 2017 
math
What is the maximum number of pieces you can divide a circular pizza into with 4 cuts? [All cuts must be distinct straight lines from one point on the edge of the pizza to another point on the edge of the pizza, and you may not move the pizza slices.]
asked on July 6, 2017 
maths
You have a calculator with 4 buttons.They can multiply the current value shown on the calculator by 2, divide the current value by 3, add 5 to the current value, or subtract 7 from the current value. If the screen starts at 6, what is the fewest button
asked on July 27, 2017 
physics
A car moving at 15 m/s skids to a stop after 20 m. How far will it skid if it is moving at 45 m/s, assuming that the braking force is constant?
asked on June 9, 2018 
probability
Amy and Blake are each dealt two cards from a standard, 52card deck. Amy's cards are known, Blake's cards are unknown. In which of these two scenarios is it MORE LIKELY that Blake has a pair: A) Amy: Queen Queen Blake: face down, face down B) Amy: Queen
asked on August 10, 2017 
maths
Find the sum of primes p such that p²+11 has exactly six different positive divisors (including 1 and the number itself).
asked on July 13, 2017 
probability and statistics
Roll a fair sixsided die until you roll a number that is less than one of your previous rolls. To three decimal places, what is the expected value of the number of rolls made?
asked on December 1, 2017 
maths
What is the maximum number of coins that can be placed on squares in an 8x8 chessboard such that each row, each column, and each long diagonal contains at most 4 coins? (Note: Only 1 coin is allowed per square.)
asked on July 12, 2017 
statistics and probabilities
You have two coins that look identical, but one of them is fair and the other is weighted. The weighted coin has a 3/4 chance of flipping heads and a 1/4 chance of flipping tails. Unfortunately, you've forgotten which coin is which! You decide to keep
asked on July 10, 2017 
Percentages
In an examination, 40% students pass in Math, 45% pass in Science and 55% pass in English. 10% pass in Math and Science, 20% in Science and English and 15 % in English and Math. Find the percentage of students who passed in all the 3 subjects
asked on March 27, 2020 
Conditional Probability
Please refer to the illustration at screenshotsfirefoxcom/jZoizoMJf8a3H0UZ/ds055uzetaobbcloudfrontnet to help answer the following question: Zeb's coin box contains 8 fair, standard coins (heads and tails) and 1 coin which has heads on both sides. He
asked on February 26, 2018 
algebra
Solve for x: (2e^2x)(7e^x)=15
asked on November 20, 2017 
logic
Ali and Zoe reach into a bag that they know contains nine lottery balls numbered 19. They each take one ball out to keep and they look at it secretly. Then, they make the following statements, in order: Ali: "I don't know whose number is bigger." Zoe: "I
asked on August 12, 2017 
logic
On a certain island there live only knights, who always tell the truth, and knaves, who always lie. One day you find 10 island natives standing in a circle. Each one states: "Both people next to me are knaves!" Of the 10 in the circle, what is the minimum
asked on July 24, 2017 
maths
A group of students decide to attend a concert. The cost of renting a bus to take them to the concert is $450, which is to be shared equally among the students. The concert promoters offer discounts to groups arriving by bus. Tickets normally costs $59
asked on July 18, 2017 
statistics
You have two coins that look identical, but one of them is fair and the other is weighted. The weighted coin has a 3/4 chance of flipping heads and a 1/4 chance of flipping tails. Unfortunately, you've forgotten which coin is which! You decide to keep
asked on July 13, 2017 
spatial reasoning
You have a pile of 1 x 2 unit dominoes. There's one way to tile a 1x2 area, 2 ways to tile a 2x2 area, 3 ways to tile a 3x2 area, and 5 ways to tile a 4x2 area. How many ways are there to tile a 5x2 area with your 1x2 domino tiles?
asked on July 10, 2017 
surface area
A unit cube with side lengths of 1 unit is cut into cuboids with heights of 1/2, 1/3, and 1/6 units, respectively. The pieces are then placed adjacent to each other to form a staircase. The total surface area of the original unit cube was 6 units. What is
asked on July 10, 2017 
Geometry
Which takes up more space: A single circle inscribed in a triangle, touching each side at a single point? Or, four identical circles, with 3 of them touching the center circle, and those same 3 touching one point each on the three sides of the
asked on July 10, 2017 
Physics
An archer lying on the ground shoots an arrow at a target that is 400 meters away, and 40 meters high. The initial velocity of the arrow is 120 m/s At what angle does he need to point his bow in order to hit the target? (Assume the value of g as 9.81
asked on July 10, 2017 
math
2x is a perfect square, 3x a perfect cube, and 5x a perfect 5th power. Find the sum of the exponents in the prime factorization of the smallest such positive integer x. Thank you.
asked on June 30, 2017 
physicsdensity
A solid right circular cone of uniform mass density is initially at rest above a body of water, so that its vertex is just touching the water's surface with its axis of symmetry along the vertical. Now, the cone falls into the water, and has zero speed at
asked on June 16, 2017 
geometry
What is the blue area in the graphic at the following link: drivegooglecom/file/d/1w4WF6LfpJB34pkmeRnN5EJsOPukZQUS/view
asked on March 23, 2020 
physics
A stone is dropped from a ledge 45m high. What will its speed on reaching the Earth be?
asked on June 13, 2018 
calculus
If a ball is thrown at the height of 10m then it bounces by 3\5 of the 10 meter and continues to resting condition, what is the total distance covered by the ball until rest?
asked on June 9, 2018 
algebra
Given: ab/cd = 2 and ac/bd= 3 Given that a,b,c and d are real numbers, find the value of ad/bc...
asked on April 9, 2018 
physics
The illustration for this problem is at ds055uzetaobbcloudfrontnet/image_optimizer/142fdba0bc53bb9ae12ecea6de058f57fef01274.png A rope of length 90cm lies in a straight line on a frictionless table, except for a very small piece at one end which hangs down
asked on March 30, 2018 
physics
The illustration for this problem is at ds055uzetaobbcloudfrontnet/image_optimizer/142fdba0bc53bb9ae12ecea6de058f57fef01274.png A rope of length 90cm lies in a straight line on a frictionless table, except for a very small piece at one end which hangs down
asked on March 28, 2018 
fractals
The images for this question can be seen at ds055uzetaobbcloudfrontnet/image_optimizer/6e5bfce857320dea5985406428cba570440e5181.png and ds055uzetaobbcloudfrontnet/image_optimizer/8b43e0b9075d5c33c65862955d90fa767bb63dac.png A fractal pattern is created in
asked on March 23, 2018 
algebra
If a + 1/a=7, what is the value of a³ + 1/a³?
asked on March 9, 2018 
physics
The illustration for this problem can be seen at screenshots(dot)firefox(dot)com/atwXACAA9akaoAji/null The army is testing out a new prototype artillery cannon with an uncommonly high muzzle velocity of 1000 m/sec . The design bugs haven't been fully
asked on March 8, 2018 
physics
The illustration for this problem can be seen at screenshots(dot)firefox(dot)com/atwXACAA9akaoAji/null The army is testing out a new prototype artillery cannon with an uncommonly high muzzle velocity of 1000 m/sec . The design bugs haven't been fully
asked on March 6, 2018 
logical reasoning
You are asked to guess an integer between 1 and N inclusive. Each time you make a guess, you are told either: (a) you are too high, (b) you are too low, or (c) you got it! You can guess as many times as you like, but are only allowed to guess too high 10
asked on February 21, 2018 
logical reasoning
You are asked to guess an integer between 1 and N inclusive. Each time you make a guess, you are told either: (a) you are too high, (b) you are too low, or (c) you got it! You can guess as many times as you like, but are only allowed to guess too high 10
asked on February 17, 2018 
algebra
For the following question, please reference the graphic at: screenshotsfirefoxcom/cjbaIYetsJhJJimy/ds055uzetaobbcloudfrontnet Pictured is the graph of the equation 4xÃ‚Â²=y(1y)(2y)Ã‚Â² rotated around the yaxis. Find the volume of the egg.
asked on February 17, 2018 
physics
Please reference the illustration at screenshotsfirefoxcom/fDDGSaztdbf0b7Uh/brilliantorg for the following problem: A bunch of bananas of total weight W is hung at one end of a string passing over a perfectly smooth pulley. At the other end, a monkey
asked on December 28, 2017 
algebra
Please reference the photo at: screenshotsfirefoxcom/ak1Ss85a8nhM4o2t/brilliantorg for the question. What is the value of XY??? Thank you
asked on December 18, 2017 
algebra
15 can be written as the difference between two positive perfect squares: 15=4²1²=161 Which of the following numbers cannot be written as the difference of two positive perfect squares? 16 17 18 19 20
asked on December 1, 2017 
geometry
Please reference the illustration at screenshotsfirefoxcom/kzZjGCIcg9EMQ0MH/brilliantorg to answer the following question: What percentage of the square's area is colored blue? 30% 35% 40% 45% 50%
asked on December 1, 2017 
physics
Please reference the illustration at: screenshotsfirefoxcom/kBXqJ4tycTCPwjUw/brilliantorg to answer the following question: On the edge of a wall, you build a brick tower that only holds because of the bricks' own weight. Your goal is to build a stable
asked on December 1, 2017 
logic
Three hats are placed on the heads of three men standing in a line. Each man can only see the men and hats in front of him. In addition, the men all know that the hats came from a bag with 3 red hats and 2 blue hats. Each man is asked if he knows which
asked on November 29, 2017 
physics
Philip forms three equal portions of leftover mashed potatoes into three shapes: a cube, a sphere, and a cylinder. Each portion is heated in the oven to the same uniform temperature. When he takes the portions out of the oven and leaves them at room
asked on November 28, 2017 
math
x is a positive integer such that the sum of its digits times 5 equals itself. What is x?? For example, 32 does not qualify because (3+2)x5=25, not 32. Prove there is only one possible value for x
asked on November 28, 2017 
geometry
Consider ann equilateral triangle, a circle, and a square that all have equal areas to each other. Which one would have the largest perimeter?
asked on November 26, 2017 
geometry
Please reference the illustration at screenshotsfirefoxcom/Cl7zsk8ZAmzCoMDM/brilliantorg to answer the following question: The Pharaoh would like to cover the lateral sides of his square pyramid with the finest marble. In order to save the cost of
asked on November 26, 2017 
maths
1,2,3,4,5 These five numbers are written on a whiteboard. You start with a score of 0. You pick two numbers, add their positive differences to your score, and erase your choice of one of the two numbers. This process is repeated until there is only one
asked on November 26, 2017 
Mathematics
Find the smallest positive integer which ends in 17, is divisible by 17, and whose digits sum to 17.
asked on November 24, 2017 
probability
There are 100 people in line to board a plane with 100 seats. The first person has lost his boarding pass, so he takes a random seat. Everyone that follows takes their assigned seat if it's available, but otherwise takes a random unoccupied seat. What is
asked on November 23, 2017 
geometry
Please refer to the following photo to answer this question: screenshotsfirefoxcom/0F0pXhMjyyk0fnnP/brilliantorg A kite is divided into four regions by two line segments that connect the midpoints of opposite sides. Is the total blue area equal to the
asked on November 22, 2017 
physics
Please reference the following picture for this question: screenshotsfirefoxcom/V57wh6MYWUXfnx5M/brilliantorg Initially, the Utube shown above is filled with water, and the level on each side is l0. After some oil is poured on side A, the level on that
asked on November 22, 2017 
calculus
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asked on November 19, 2017 
math
Calculate the sum of the series: π²/3!π^4/5!+π^6/7!π^8/9!+π^10/11!....
asked on November 19, 2017 
math
The pyramid of integers above is constructed in such a way that each "father" has exactly 3 "children": 1>2,3,4 2>5,6,7 3>8,9,10 4>11,12,13 5>14,15,16 6>17,18,19 . . . What number is the father of 2017?
asked on November 19, 2017 
physics
A rectangular box of length 2/3m is initially traveling at 2 m/s with its entire length over a smooth (perfectly frictionless)surface .The box gradually moves onto a rough surface and stops the instant that its entire length is positioned within the rough
asked on November 19, 2017 
algebra
Rob is 21 years old, angie is twice as old as Rob was when Angie was old as Rob is now, how old is angie?
asked on November 16, 2017 
math
There are 10 coins, 5 of which are heads up and 5 of which are tails up. On each turn, you choose exactly 3 coins and flip them over. What is the minimum number of turns needed to make all of the coins heads up?
asked on November 16, 2017 
logic
What is the least number of unit squares that you need to remove from a 5 by 3 checker board in order to make it impossible for anyone to put an "X" in 3 remaining squares to make a connected vertical, horizontal, or diagonal set of 3 (a set that looks
asked on August 26, 2017 
logic
What is the least number of unit squares that you need to remove from a 5 by 3 checker board in order to make it impossible for anyone to put an "X" in 3 remaining squares to make a connected vertical, horizontal, or diagonal set of 3 (a set that looks
asked on August 24, 2017 
algebra
For how many different pairs of numbers, a and b, are the following equalities true: a+b=a*b=a/b ??????? Thank you for your help.
asked on August 23, 2017 
probability and statistics
An icecream store has exactly 6 flavors of icecream. Each of 6 friends likes exactly 4 flavors. Is there guaranteed to be a flavor which at least 4 friends like?
asked on August 7, 2017 
computer science
Sara needs to needs to trek from an oasis to a destination 10 miles away across a barren desert. However, she finds herself dealing with the following limitations: a) Crossing one mile of desert requires using 1 gallon of water. b) She can only carry 6
asked on August 7, 2017 
physics
Suppose we are given an arbitrary form for the acceleration a(t) of a particle that starts from rest at r(t_i)=0. What would be the derivation of its' position at r(t_f): a)(t_f  t_i)⌠t_f a(t)dt ⌡t_i b) v(t_f)+v(t_i)/2 ((t_ft_i)) c)⌠t_f dt ⌠t
asked on August 7, 2017 
logic
40 matchsticks are arranged to form a 4 by 4 grid of 16 smaller squares, 4 matchsticks to a small square. What is the fewest number of matchsticks that need to be removed so that there are no squares (of any size) remaining?
asked on August 5, 2017 
logic
40 matchsticks are arranged to form a 4 by 4 grid of 16 smaller squares. What is the fewest number of matchsticks that need to be removed so that there are no squares (of any size) remaining?
asked on August 2, 2017 
maths
The values A,B,C, and [(A/B)+C], are all integers which are divisible by 3. Then, which of the following statements must be true: A is divisible by 9 B is divisible by 9 C is divisible by 9 A and B are both divisible by 9 A,B,and C are all divisible by 9
asked on July 27, 2017 
number theory
The values A,B,C, and [(A/B)+C], are all integers which are divisible by 3. Then, which of the following statements must be true: A is divisible by 9 B is divisible by 9 C is divisible by 9 A and B are both divisible by 9 A,B,and C are all divisible by 9
asked on July 26, 2017 
maths
A group of students decide to attend a concert. The cost of renting a bus to take them to the concert is $450, which is to be shared equally among the students. The concert promoters offer discounts to groups arriving by bus. Tickets normally costs $59
asked on July 20, 2017 
probability
There are 100 people in line to board a plane with 100 seats. The first person has lost their boarding pass, so they take a random seat. Everyone that follows takes their assigned seat if it's available, but otherwise takes a random unoccupied seat. What
asked on July 15, 2017 
physics
Robin Hood has to shoot an arrow at an apple that sits on a wall 400 meters away, at a height of 40 meters. He must shoot at an angle of 60 degrees. What must the initial velocity of the arrow be to hit the target? Assume he's shooting laying down on the
asked on July 9, 2017 
number theory
If you wrote down at all whole numbers from 1 to 1000... 1,2,3,4,5....999,1000 ...which digit would appear the least?
asked on July 6, 2017 
math
A right triangle has vertices on a grid at (0,0), (8,0), and (8,6). There is a point on the hypotenuse, (4,3), made up of integers. The question is: If the corners of the triangle were instead at (0,0), (1200,0), and (1200,1000),how many dots from the grid
asked on July 6, 2017 
math
The positive number X is divisible by 42, and is composed of only 1s and 0s when written in base 10. What's the smallest number that X might be?
asked on July 6, 2017 
geometry
find the focus of x^2+4y^2+2x+24y++28=0. Thank you
asked on July 3, 2017 
Physics
Robin Hood is known for stealing from the rich to give to the poor. He finds himself surrounded by some angry noblemen who demand he return their gold chest. Outnumbered, he takes an arrow from his quiver and fires it straight into the air, scattering the
asked on June 16, 2017 
Physics
A solid right circular cone of uniform mass density is initially at rest above a body of water, so that its vertex is just touching the water's surface with its axis of symmetry along the vertical. Now, the cone falls into the water, and has zero speed at
asked on June 15, 2017 
physics
A solid right circular cone of uniform mass density is initially at rest above a body of water so that its vertex is just touching the waters surface with its axis of symmetry along the vertical. Now, the cone falls into the water, and has zero speed at
asked on June 15, 2017 
Physics
An interplanetary probe speeding in deep space suddenly needs to make a left turn. It is presently traveling at v=20000 m/s , and needs to make a quarter circle turn, continuing at the same tangential speed. It is equipped with an ion thruster rocket
asked on June 14, 2017 
Geometry
An equilateral triangle, ABC, has two of its vertices, A and B, below the xaxis; has the third vertex C above the xaxis, and contains the points (0,0) on segment AC, and (0,1) on segment BC. How long is the path traced out by all possible points C to two
asked on June 13, 2017

geometry
Thanks for your help, guys. This problem's been nagging me for a while. The area of the square was 4x², once you solved for x............
posted on March 25, 2020 
algebra
3+1.5=4.5 4.5+1.5=6 6+1.5=7.5 . . . Since each subsequent number can be found simply by adding a constant to the previous number, the sequence is, by definition, an arithmatic progression
posted on March 23, 2018 
math
Out of 10 questions, you answer 4 1pointers and 5 twopointers, leaving one question incorrectly answered. If there are 4 1point questions, and 6 2point questions, this gives you 16 points total for the quiz. You miss one 2point question, giving you a
posted on March 2, 2018 
alegbra
If the creator receives 8% of each game sold, then the company that produces the game gets the remaining 1008, or 92% of the revenue. Let n be the selling price of the game. Then: .92n=10.10 n=10.10/.92=10.98 price of the game ☺☺☺☺
posted on March 2, 2018 
algebra
Let n be the amount contributed in 2002. In 2003, the contributions were 15% greater, or 1.15n. In 2004, the contributions were 10% greater than that, or 1.1(1.15)n. So: 1.265n=8855 n=7000 ☺☺☺☺
posted on March 2, 2018 
Mathematics
The cells divide every 5 minutes, starting from 1. Let x equal every 5 minute period. Then: 1,000,000=1*2^x ln 1,000,000=ln 2^x=x ln 2 x=19.93 19.93 x 5=99.66 minutes before the cell population reaches 1,000,000.
posted on February 27, 2018 
Math
The penny's height at any time, t, seconds would be given by the equation h(t)=16t²+10t+300. It reaches its' maximum height at 10/32, or 0.3125 seconds (b/2a). This gives it a maximum height of 301.5625 ft. The penny lands at h(t)=0, or
posted on February 27, 2018 
Math
The architect was not hired because those side lengths are impossible to construct a triangle. Imagine the 2nd piece, 37 ft. Now, take the other two sides: 15 and 21 ft. The two shorter pieces would be, when added together, shorter than the first piece
posted on February 26, 2018 
Algebra 1
If this baseball is propelled upwards with a velocity of 30 ft/s, then the formula for its' height after t seconds would be: h(t)=16t²+30t+6 It's maximum height is reached at b/2a seconds, from the equation h(t)=a(t)²+b(t)+c. In this case, that would
posted on February 26, 2018 
Math
Let c be Christian, and m be Marie. Then: c=3m and m=c12 So: 3(c12)=c 3c36=c 2c=36 c=18 ☺☺☺☺
posted on February 17, 2018 
Math
19/25 x 25000=19x25000/25=19 x (25000/25)=19x1000=19000 ☺☺☺☺
posted on February 16, 2018 
math
4πr²=4π(1.25)²=6.25π=19.63 in² 4/3 πr³=4/3 π(1.25)³=8.18123 in³ ☺☺☺☺
posted on February 15, 2018 
math
Let n be the total amount of registered doctors that year. Then: 0.233n=46800 n=46800/0.233=200858.37 doctors registered (rounds down to 200,858) ☺☺☺☺
posted on February 15, 2018 
math
Let d be the distance between Abigail's apartment and her campus. Then: d/3=d/12 +36/60 20d=5d+36 15d=36 d=36/15, or 12/5 miles between Abigail's apartment and the campus ☺☺☺☺
posted on February 15, 2018 
math
f(x)=3x²+12x+2 f(x)/3=x²+4x+2/3 f(x)/3 +4=x²+4x+4+2/3=(x+2)²+2/3 f(x)/3=(x+2)²10/3 f(x)=3(x+2)²10 Hope this helps ☺☺☺☺
posted on February 12, 2018 
math
y=2.9046(1.9798)^x Solve for y=13. So: 13=2.9046(1.9798)^x 13/2.9046=1.9798^x 4.47566=1.9798^x ln 4.47566=ln 1.9798^x=x ln 1.9798 x=2.1942355 The number of days, at that rate, would be 2.1942355 ☺☺☺☺
posted on December 2, 2017 
Pre cal
3x^4+27x^2+1200=0 0=3x^427x^21200 (3x²+48)(x²25)=0 3(x²+16)(x+5)(x5)=0
posted on November 29, 2017 
Mathematics
thanks
posted on November 25, 2017 
français
why are researchers and scientists from african countries migrating to Western countries?
posted on November 25, 2017 
Álgebra
Let n be the common factor between the two pieces. Then, the length of each piece is given by 3n and 7n, respectively. The length of the longer piece would be 7n/v+4 So: 3n+7n=v+4 3n+7n/v+4=1 3n/v+4 +7n/v+4=1 7n/v+4=13n/v+4
posted on November 24, 2017 
Algebra
1.1^6=1.771561 1.771561*2100=3720.28
posted on November 22, 2017 
Math
4 ft=48 in 48 in/8 in=6 ☺☺☺☺
posted on November 22, 2017