stranger
Most popular questions and responses by stranger
maths
ABC is an acute triangle with ∠BCA=35∘. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of ∠ABC(in degrees)?
asked on March 30, 2013 
Physics
A 80 kg climber is standing horizontally on a perfectly vertical cliff face. The climber is 1.8 m tall and is attached by a 2 m long rope fastened around their middle to a point on the cliff above them. What is the normal force the cliff face exerts on the
asked on March 18, 2013 
physics
Consider a horizontal road with such a set of traffic lights, each spaced 100 m apart. A car sits at the first traffic light. At t=0 the light turns green and the car accelerates. What is the maximum time t in secondsthe next light must turn green
asked on May 27, 2013 
Physics
The fundamental frequency of the G string of a guitar is f=196Hz. The fundamental vibrational mode of the string is described by the standing wavey(t,x)=acos(2πft)sin(πxL)where L=65cm is the length of the string and a=1mm is the amplitude of the
asked on April 1, 2013 
Geometry
ABC is a right angled triangle with ∠ABC=90∘ and side lengths AB=24 and BC=7. A semicircle is inscribed in ABC, such that the diameter is on AC and it is tangent to AB and BC. If the radius of the semicircle is an improper fraction of the form a/b,
asked on March 18, 2013 
Geometry
Convex quadrilateral ABCD has sides AB=BC=21, CD=15 and AD=9. Given additionally that ∠ABC=60∘, what is the length of BD?
asked on April 8, 2013 
physics
Three identical conducting spheres are located at the vertices of an equilateral triangle ABC. Initially the charge the charge of the sphere at point A is qA=0and the spheres at B and C carry the same charge qB=qC=q. It is known that the sphere B exerts
asked on May 13, 2013 
Probability
A school is running a raffle for two prizes. 59 tickets were sold for the raffle, numbered 1,…,59. All the tickets are put into a hat and a teacher picks out two tickets which have numbers i and j from the hat. What is the expected value of i−j?
asked on April 8, 2013 
geometry (help steve)
A circle of radius 1 is drawn in the plane. Four nonoverlapping circles each of radius 1, are drawn (externally) tangential to the original circle. An angle γis chosen uniformly at random in the interval [0,2π). The probability that a half ray drawn
asked on June 24, 2013 
Maths
ABC is a right angled triangle with ∠ABC=90∘ and side lengths AB=24 and BC=7. A semicircle is inscribed in ABC, such that the diameter is on AC and it is tangent to AB and BC. If the radius of the semicircle is an improper fraction of the form a/b,
asked on March 19, 2013 
Trignometry
ABCD is a square where M and N are midpoints of AD and CD, respectively. If sin∠MBN=a/b, where a and b are coprime positive integers, what is the value of a+b?
asked on March 18, 2013 
Geometry
Find the number of 6 term strictly increasing geometric progressions, such that all terms are positive integers less than 1000.
asked on May 16, 2013 
Geometry
There are 100 runners, each given a distinct bib labeled 1 to 100. What is the most number of runners that we could arrange in a circle, such that the product of the numbers on the bibs of any 2 neighboring runners, is less than 1000?
asked on April 20, 2013 
Science
What is the likability of a earthquake and volcanic eruption happening in Minnesota
asked on May 4, 2015 
Geometry(first one is typo)
Let ƒÆ=sin −1 7/25 . Consider the sequence of values defined by a n =sin(nƒÆ) . They satisfy the recurrence relation a n+2 =k 1 a n+1 +k 0 a n ,n¸N for some (fixed) real numbers k 1 ,k 0 . The sum k 1 +k 0 can be written as p q , where p and q are
asked on April 11, 2013 
Geometry
Let ƒÆ=sin −1 7 25 . Consider the sequence of values defined by a n =sin(nƒÆ) . They satisfy the recurrence relation a n+2 =k 1 a n+1 +k 0 a n ,n¸N for some (fixed) real numbers k 1 ,k 0 . The sum k 1 +k 0 can be written as p q , where p and q are
asked on April 11, 2013 
math
ABC is a triangle with circumcenter O, obtuse angle BAC and AB
asked on April 10, 2013 
maths
Find the largest possible value of x^3+y^3+z^3 for realx, y, z, such that xyz^2=−64y−128x x^2yz=−32y−32z 3xy^2z=128x−64z
asked on April 1, 2013 
Trigonometry
Every point (x,y) on the curve y=log(3x)/log2 is transferred to a new point by the following translation (x′,y′)=(x−m,y−n), where m and n are integers. The set of (x′,y′) form the curve y=log(12x−96)/log2. What is the value of m+n? Details
asked on March 25, 2013 
calculas
At time t=0 s, the radius of a circle is equal to 15 cm. The radius of the circle increases at a rate of 0.5 cm/s. The rate of change of area at t=20 s is equal to mπ cm^2/s, where m is a positive integer. What is the value of m?
asked on March 22, 2013 
math
25 independent, fair coins are tossed in a row. What is the expected number of consecutive HH pairs? Details and assumptions If 6 coin tosses in a row give HHTHHH, the number of consecutive HH pairs is 3.
asked on March 19, 2013 
Combinations Maths
25 independent, fair coins are tossed in a row. What is the expected number of consecutive HH pairs? If 6 coin tosses in a row give HHTHHH, the number of consecutive HH pairs is 3.
asked on March 18, 2013 
Number theroy
What is the 50th smallest positive integer that can be written as the sum of distinct nonnegative integer powers of 3?
asked on March 18, 2013 
Limit Math
Evaluate lim x→∞ 2x/(√(x^2+3)4) in words 2x divide by(root(xsq +3) 4)
asked on March 18, 2013 
Trignometry
Let m and M be the minimum and maximum values of the domain of f(x)=sin^−1(x2−35), respectively. What is the value of M−m? sin^1 is sin inverse
asked on March 18, 2013 
Algebra
A is a 2 by 2 matrix. Given that A=(5 1) (1 5) , what is the value of det(A)? det(A) is determinant of A
asked on March 18, 2013 
geometry
ABC is a triangle with AC=139 and BC=178. Points D and E are the midpoints of BC and ACrespectively. Given that AD and BE are perpendicular to each other, what is the length of AB?
asked on June 24, 2013 
statics
A bag contains 4 balls, each of which have a positive integer written on it. Let X be the random variable of the value written on a single ball drawn from the bucket. If E[X]=8, what is the maximum possible value of E[X^2]?
asked on June 24, 2013 
physics
An airplane of a certain density and shape flies at a constant speed. To do so, it must fly with a certain velocity v0. If the size of the airplane is scaled up in length, width, and height by a factor of two, it can only fly above a new velocity v1.
asked on May 27, 2013 
physics
Many of you may have noticed the phenomenon that basketballs get flat if the weather is cold. If a basketball was inflated to a gauge pressure of 60,000 Pa when the temperature outside was 20∘C, what is the gauge pressure inside the basketball in
asked on May 27, 2013 
physics
Two point charges +q=1 μC and −q=−1 μC with mass m=1 g are fixed at the positions ±r⃗ 0 with r0=1 m. The charges are released from rest at t=0. Find the time τ in seconds at which they collide.Hint: Can you do it without
asked on May 13, 2013 
Geometry
If two sixsided dice are rolled, the probability that they both show the same number can be expressed as a b where a and b are coprime positive integers. What is the value of a+b ?
asked on April 11, 2013 
maths
A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is
asked on April 2, 2013 
maths
A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is
asked on April 1, 2013 
maths
Find the number of different ordered quadruples (a,b,c,d) of complex numbers such that a^2=1 b^3=1 c^4=1 d^6=1 a+b+c+d=0
asked on April 1, 2013 
Algebra
As x ranges over all real values, what is the minimum value of f(x)=x123+x456 + x789
asked on March 26, 2013 
Maths Probability
When writing a math expression, any time there is an open bracket "(", it is eventually followed by a closed bracket ")". When we have a complicated expression, there may be several brackets nested amongst each other, such as in the expression
asked on March 25, 2013 
Combinations Maths
For how many positive integers n are there exactly ⌊n/2⌋ or ⌈n/2⌉ primes less than or equal to n?
asked on March 18, 2013 
Geometry
BC is a triangle with ∠BAC=60∘,AB=5 and AC=25. D is a point on the internal angle bisector of ∠BAC such that BD=DC. What is AD^2? It is not stated that D lies on BC. This assumption is not necessarily true.
asked on March 18, 2013 
Algebra
Let S(N) denote the digit sum of the integer N. Let M denote the maximum value of N/S(N), where N is a 3digit number. How many 3digit numbers N satisfy N/S(N)=M? The digit sum of an integer is the sum of all its digits. For example, the digit sum of
asked on March 18, 2013 
Algebra
We define n♡ recursively as follows. 1♡=1; n♡=((n−1)♡)⋅n+1 Find the largest n
asked on March 18, 2013 
Algebra
How many positive integers n≤1000 cannot be written in the form a2−b2−c2 where a,b and c are nonnegative integers subject to a≥b+c?
asked on March 18, 2013 
Slope Maths
What is the slope of the line tangent to the quadratic f(x)=4x^2−3x+6 at x=7?
asked on March 18, 2013 
Trignometry
The angles in triangle ABC satisfy 6sin∠A=3√(3)sin∠B=2√(2)sin∠C. If sin^2∠A=a/b, where a and b are coprime positive integers, what is the value of a+b?
asked on March 18, 2013 
Algebra
The function f(x)=x^4−10x^3+40x^2−80x+64 has four complex roots, one of which is 2−2i. What is the sum of all real and imaginary coefficients of these roots? i here is imaginary unit i.e. i^2 = 1
asked on March 18, 2013

L.A
All is wrong or eighter the questions are switched
posted on May 14, 2019 
Language arts
I think there similarity would be they both want to help Milo in anyways that they can. But they both differ in character as well as beliefs in life. Tock is responsible, brave and loyal. He wants Milo to learn that time should not be wasted but rather it
posted on March 22, 2019 
math
Thx So much although I'm late
posted on March 21, 2019 
math
Whats the answer tho
posted on February 14, 2019 
Social Studies
^ BETTTTTTTTTTT
posted on October 16, 2017 
Science
Correct.
posted on October 16, 2017 
connections Academy sucks
same I turned in a portfolio and did everything they told me too do and turned it in and then I couldent do my lesson for the next day cause they said I did not do it, I turned in my work and they said "oh it was not good enough do it again" and I had to
posted on November 8, 2016 
Math
1 because she only has 1 pair of jeans
posted on October 4, 2016 
math
Nothing is helpful I got 1 13/20
posted on October 4, 2016 
math
Why do you just use the denominators?
posted on October 4, 2016 
geometry
7
posted on July 29, 2016 
SS
Is it C or D?
posted on January 25, 2016 
social studies
wow thanks a lot I go to connections two and it is ok ig
posted on April 15, 2015 
physics
Lol brilliant cheaters wtf
posted on January 14, 2014 
geometry
150
posted on August 5, 2013 
SCIENCE,PHYSICS
3 is the answer Ohh brilliant cheateres rockzzz Calvin shokzzz Plz tell other answers to public
posted on July 4, 2013 
math
wrong 326
posted on June 1, 2013 
physics
P1/t1=p2/t2
posted on May 28, 2013 
math
He is correct only 1 integer satisfy he mean
posted on May 2, 2013 
Maths
yes it is 3
posted on April 14, 2013 
Geometry
What is a and what is b?
posted on April 11, 2013 
maths
I got it till now maximize a+b, if Re (b)=Im(a), Re (a)21
posted on April 3, 2013 
maths
thanks
posted on April 1, 2013 
Algebra
Strange r meets stranger
posted on March 26, 2013 
Physics/math
Can't get it, Didn't studied this topic, Would you please work the solution.
posted on March 26, 2013 
GEOMetry(TRIANGLE)
how
posted on March 25, 2013 
Trigonometry
Suppose N = xyzyx, where x is nonzero but y and z could be any digit. Then there are 9(10^2) = 900 possible palindromes to consider. Recall that a number is divisible by 4 iff its last two digits are divisible by 4. Thus, if N is divisible by 4, then "yx"
posted on March 21, 2013 
Math
700 $ make 42281 $ in ten years Totally wrong this cant be true He had invested money that will be get in a collection not in payment
posted on March 19, 2013 
algebra
Let no. of men be x No. of women = 5x + 2 Total students = No. of men + women 50=x + 5x+2 48=6x x=8 No. of women = 5x + 2 = 5 * 8 + 2 =42 (ans)
posted on March 19, 2013 
Math
This Compound interest using Amount = principle * ((Rate + 100)/100)^time Here Rate is per time period i.e 8% per annum will be 2% per quater Time period is 10 years = 40 quater year P=700 $ Putting values Amount = 700 * ((2+100)/100)^40 =700 * (51/50)^40
posted on March 19, 2013 
math
30 + 20/((1*5)*2) since 1*5 = 5 and 5*2 = 10 this become 30 + 20/10 30+2 32
posted on March 19, 2013 
Physics help ASAP please
No direction no length of river how broad river is then how to find?
posted on March 19, 2013 
math
how
posted on March 19, 2013 
Arithmetic
B1/2 Let no. of books be x No. of history books equal x into 1/3 I.e.x/3 No. Of English books equal x into 1/3 I.e. x/6 Rest books = no. Of science books =total books (history books+English books) =×(×/3 +×/6) =x(3x/6) =xx/2 =x/2 books are of
posted on March 19, 2013 
Mathematics
Try to use remainder therom reverse it from divident subtract remainder then divide with no remainder ans will come
posted on March 18, 2013 
Combinations Maths
okk
posted on March 18, 2013 
Physics
i could not get there hw to put angle
posted on March 18, 2013 
physics
0.0928 kg
posted on March 18, 2013 
easy algebra!
10
posted on March 18, 2013 
math
2 & 3 are both factors of 6. Meaning whenever 6 goes in a set, it can be replaced by two 3's or three 2's. 6 * 4 6 * 3; 3 * 2 6 * 3; 2 * 3 6 * 2; 3 * 4 6 * 2; 2 * 6 6 * 2; 3 * 2; 2 * 3 6 * 1; 3 * 6 6 * 1; 2 * 9 6 * 1; 3 * 4; 2 * 3 6 * 1; 3 * 2; 2 * 6 6 *
posted on May 9, 2012 
Psychology
According to Freud, defense mechanisms are protective methods, by the ego, that reduce anxiety by unconsciously distorting reality. Definitions & Examples: Repression  banishing anxietyarousing thoughts, feelings, and memories from consciousness. e.g.
posted on May 9, 2012 
Calculus
Oops, sorry about that, the correct answer is 7 (4 * 6) + (5 * 2) + (1 * 7) 24 + (10) + (7) 14 + (7) 7 7.
posted on May 9, 2012 
Calculus
The Dot Product is a scalar (number) (4 * 5) + (5 * 2) + (1 * 7) 20 + 10 + 7 10 + 7 3 3.
posted on May 9, 2012 
algebra
Let x = side of square to cut off from each corner 20  2x = width of bottom rectangle 28  2x = length of bottom rectangle V = x(20  2x)(28  2x) = 4x(10  x)(14 x) = V = 4x(140  24x + x²) V = 4(140x  24x² + x³) Differentiating and equating to zero
posted on May 9, 2012 
Math
There are 16 oz in 1 lb. So, 1 lb 4 oz = (1 * 16) + 4 = 20 oz  Each day, Robert feeds his dog 20 oz If the bag is 40 lbs, and 1 lb = 16 oz  The bag is 640 oz 640 oz of food, divided by 20 oz servings  It will last 32 days.
posted on May 9, 2012 
choice
Healthy behaviors and choices are decisions made when one is conscience of their overall health status, and thus will lead to minimized negative consequences. Overtime, this will positively affect an individual's health status. Conversely, behaviors that
posted on May 9, 2012