stranger

Most popular questions and responses by stranger
1. 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)?

2. 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

3. 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

4. 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

5. 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,

6. 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?

7. 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

8. 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|?

9. geometry (help steve)

A circle of radius 1 is drawn in the plane. Four non-overlapping 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

10. 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,

11. 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?

12. Geometry

Find the number of 6 -term strictly increasing geometric progressions, such that all terms are positive integers less than 1000.

13. 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?

14. Science

What is the likability of a earthquake and volcanic eruption happening in Minnesota

15. 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

16. 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

17. math

ABC is a triangle with circumcenter O, obtuse angle BAC and AB

18. 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

19. 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

20. 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?

21. 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.

22. 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.

23. Number theroy

What is the 50th smallest positive integer that can be written as the sum of distinct non-negative integer powers of 3?

24. Limit Math

Evaluate lim x→∞ 2x/(√(x^2+3)-4) in words 2x divide by(root(xsq +3) -4)

25. 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

26. 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

27. 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?

28. 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]?

29. 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.

30. 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

31. 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

32. Geometry

If two six-sided 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 ?

33. 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

34. 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

35. 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

36. Algebra

As x ranges over all real values, what is the minimum value of f(x)=|x-123|+|x-456| + |x-789|

37. 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

38. Combinations Maths

For how many positive integers n are there exactly ⌊n/2⌋ or ⌈n/2⌉ primes less than or equal to n?

39. 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.

40. 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 3-digit number. How many 3-digit 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

41. Algebra

We define n♡ recursively as follows. 1♡=1; n♡=((n−1)♡)⋅n+1 Find the largest n

42. Algebra

How many positive integers n≤1000 cannot be written in the form a2−b2−c2 where a,b and c are non-negative integers subject to a≥b+c?

43. Slope Maths

What is the slope of the line tangent to the quadratic f(x)=4x^2−3x+6 at x=7?

44. 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?

45. 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

1. L.A

All is wrong or eighter the questions are switched

posted on May 14, 2019
2. 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
3. math

Thx So much although I'm late

posted on March 21, 2019
4. math

posted on February 14, 2019
5. Social Studies

^ BETTTTTTTTTTT

posted on October 16, 2017
6. Science

Correct.

posted on October 16, 2017

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
8. Math

1 because she only has 1 pair of jeans

posted on October 4, 2016
9. math

Nothing is helpful I got 1 13/20

posted on October 4, 2016
10. math

Why do you just use the denominators?

posted on October 4, 2016
11. geometry

-7

posted on July 29, 2016
12. SS

Is it C or D?

posted on January 25, 2016
13. social studies

wow thanks a lot I go to connections two and it is ok ig

posted on April 15, 2015
14. physics

Lol brilliant cheaters wtf

posted on January 14, 2014
15. geometry

150

posted on August 5, 2013
16. SCIENCE,PHYSICS

3 is the answer Ohh brilliant cheateres rockzzz Calvin shokzzz Plz tell other answers to public

posted on July 4, 2013
17. math

wrong 326

posted on June 1, 2013
18. physics

P1/t1=p2/t2

posted on May 28, 2013
19. math

He is correct only 1 integer satisfy he mean

posted on May 2, 2013
20. Maths

yes it is 3

posted on April 14, 2013
21. Geometry

What is a and what is b?

posted on April 11, 2013
22. maths

I got it till now maximize a+b, if Re (b)=-Im(a), Re (a)-21

posted on April 3, 2013
23. maths

thanks

posted on April 1, 2013
24. Algebra

Strange r meets stranger

posted on March 26, 2013
25. Physics/math

Can't get it, Didn't studied this topic, Would you please work the solution.

posted on March 26, 2013
26. GEOMetry(TRIANGLE)

how

posted on March 25, 2013
27. 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
28. 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
29. 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
30. 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
31. 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

No direction no length of river how broad river is then how to find?

posted on March 19, 2013
33. math

how

posted on March 19, 2013
34. Arithmetic

B-1/2 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) =x-x/2 =x/2 books are of

posted on March 19, 2013
35. 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
36. Combinations Maths

okk

posted on March 18, 2013
37. Physics

i could not get there hw to put angle

posted on March 18, 2013
38. physics

0.0928 kg

posted on March 18, 2013
39. easy algebra!

10

posted on March 18, 2013
40. 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
41. Psychology

According to Freud, defense mechanisms are protective methods, by the ego, that reduce anxiety by unconsciously distorting reality. Definitions & Examples: Repression - banishing anxiety-arousing thoughts, feelings, and memories from consciousness. e.g.

posted on May 9, 2012
42. 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
43. 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
44. 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
45. 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
46. 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