Shin
Most popular questions and responses by Shin
Math (Geometric Progression)
5 distinct positive reals form an arithmetic progression. The 1st, 2nd and 5th term form a geometric progression. If the product of these 5 numbers is 124 4/9, what is the product of the 3 terms of the geometric progression? Note: The phrase "form an
asked on June 22, 2013 
Math
Sixty men working on a construction job have done 1/3 of the work in 18 days. The project is behind schedule and must be accomplished in the next twelve days. How many more workers need to be hired?
asked on May 31, 2013 
Math
5 distinct positive reals form an arithmetic progression. The 1st, 2nd and 5th term form a geometric progression. If the product of these 5 numbers is 124 4/9, what is the product of the 3 terms of the geometric progression? Note: The phase "form an
asked on May 11, 2013 
Math (Variation)
The cost of a pizza varies directly as the square of its radius. If a pizza with a 6inch radius costs ₱148.00, how much should a pizza with an 11inch radius cost?
asked on February 11, 2014 
Physics
A roller coaster works by gravitational energy. The coaster car is pulled up to a high point and then released, rolling downwards on the track through all manners of curves and loops. I have a short roller coaster car that I pull up to the top of a hill of
asked on May 6, 2013 
physics
a car is moving at 17.7 m/s when it begins to slow down with a deceleration of 2.5 m/s2. how long does it take to travel 20 meters as it slows down
asked on September 5, 2016 
Math (Trigonometry [Polar Form])
Let z be a complex number such that z = 2(cos 8∘ + i cos 82∘).Then z^5 can be expressed as r(sin α∘+ i cos α∘), where r is a real number and 0 ≤ α ≤ 90. What is the value of r+α? Hint to solve: Example Question: Let z be a complex number
asked on June 22, 2013 
College math
Highwq curves. If a circular curve without any banking has a radius of R feet, the speed limit L in miles per hour is L = 1.5 aqrt(R) (a) Find the speed limit for a curve having a radius of 400 feet. (b). If the radius of a curve doubles, what happens to
asked on April 30, 2011 
Trigonometry
There are four complex fourth roots to the number 4−4√3i. These can be expressed in polar form as z1=r1(cosθ1+isinθ1) z2=r2(cosθ2+isinθ2) z3=r3(cosθ3+isinθ3) z4=r4(cosθ4+isinθ4), where ri is a real number and 0∘≤θi
asked on May 27, 2013 
college math
Braking distance The braking distance y in feetthat it takes for a car to stop on wet ,level pavement can be estimated by y = 1/9 x^2, where the x is the speed of the car in miles per hour Find the speed associated with with each braking distance. (a.) 25
asked on April 28, 2011 
Math (Combinatorics)
40 students attended the brilliant summer camp at Stanford University. "k" of the students at the camp are working on math problems and the others are working on nonmath problems. One of the camp mentors noticed that whenever all the students were
asked on June 26, 2013 
Math (Combinatorics)
A lottery ball drawing machine has 50 balls, each labeled with a distinct integer from 1 to 50. Every Sunday, four different balls are drawn to determine the winning numbers. You have last Sunday's ticket with the numbers {3,7,12,15}. You missed the
asked on May 6, 2013 
College math
Highway curves If a circular curve without any banking has a radius of R feet, the speed limitL.in miles per hour for the curve is L=1.5 R. (a.)Find the speed limit for a curve having a radius of 400 feet. (b.) If the radius of a curve doubles, what
asked on April 28, 2011 
Math
Three ships — the Nina, the Pinta, and the Santa Maria — are setting sail from Spain on a mission to find the shortest route to the West Indies. The year is 1492 and Columbus is about to sail the ocean blue... "NO! It can't be so!" shouted Captain
asked on June 20, 2013 
Math (Percentage)
An upscale clothing boutique charges $300 for a brand name pair of jeans, which is 50% more than the amount it costs the store to buy one pair of these jeans. As a benefit of working there, employees can purchase the pair of jeans at 30% off the store's
asked on May 7, 2013 
Trigonometry
The quadratic equation x^2−9x+10=0 has roots tanα and tanβ, where 0∘
asked on May 21, 2013 
Math (Algebra)
For each degree 17 polynomial f with real coefficients, let sf be the number of real roots (counted with multiplicity). Let S be the set of all possible values of sf. What is S?
asked on May 7, 2013 
Math (Algebra)
If a is a real number and a cubic equation f(x) = x^3 − 8x^2 + (a+12)x − 2a has a repeated root, what is the sum of all the possible values of a?
asked on May 7, 2013 
physics
Got a question that I'm not quite sure how to approach: "A force of 2500 N acting on the area of 120cm3 evokes a pressure of:" This is all the info given in the question.
asked on June 1, 2012 
Physics
On an unwanted weather situation, rescue operators fly a helicopter that is aimed to travel 100 knots due southwest. However, two winds coming from different directions move it sideways. One wind is making it move sideways 20 knots northward while the
asked on July 16, 2017 
Physics
A plane flying in a straight line at constant altitude of 2000 m above the ground with a speed of 200m/s drops an object. Explain how the velocity of the object is actually affected by air resistance. Show how the resistivity force of air and velocity of
asked on March 3, 2014 
Math (Trigonometry)
θ is an acute angle such that tan(θ)=1/4. What is the value of 17√17*(sinθ+cosθ)?
asked on June 22, 2013 
Calculus (Arc Length)
Consider the helix parametrized with the vector equation r(t)=cos t i+ sin t j + t k. The length L of the helix between the points (1,0,0) and (1,0,6π) is equal to aπ. What is the value of a^2?
asked on June 20, 2013 
Geometry
Triangle ABC has side lengths AB=8, BC=12 and CA=14. Given that D, E and F are midpoints of BC, CA and AB, respectively. Find the value of AD^2+BE^2+CF^2.
asked on June 4, 2013 
Trigonometry
Given that sin(2θ)=2/3, the value of sin^6θ+cos^6θ can be written as a/b with a and b as coprime positive integers. Find a+b.
asked on May 27, 2013 
Math (Algebra)
If the ratio of the roots of the quadratic equation x^2−28x+A=0 is 2:5, what is the product of the roots of the quadratic equation x^2+Ax+2A+3=0?
asked on May 22, 2013 
Probability
Bret and Shawn are playing a game where each turn the players roll a 20sided die fair and then add the number they get to their score. The winner is the player with the highest score at the end of the game (there may be a tie). Before the last turn, Shawn
asked on May 22, 2013 
Trigonometry
Γ is the circumcircle of triangle ABC with radius 12√2. If 9cos(∠B+∠C)cos∠A=−1, what is the value of BC?
asked on May 21, 2013 
Math (Algebra)
An elevator named L in "63 Building" in Seoul is notorious for its low speed. It takes 3 seconds for L just to move one floor. It takes another 20 seconds for it to have its door open and close automatically. What is even more frustrating, is that the
asked on May 11, 2013 
Optics
A person only reads character when 25cm from her eyes. Calculate the dioptric power of a lens she need so that the characters are clear at 1m distance
asked on February 14, 2018 
Physics
A 50Newton box lays on a plane inclined 20degrees from the ground. Though the weight of the box is directed downwards, we know that some component of it is responsible why the box would slide. Find the value of this component
asked on July 10, 2017 
Physics
Shun started driving southwest for 450 meters then turned south south for 500 meter and stopped. Find Shun's displacement
asked on July 8, 2017 
Basic Linear Algebra
1. At what point does the graph of f(x)=3x12 crosses the xaxis? 2.At what point does the graph of f(x)=5x+1 crosses the yaxis?
asked on February 5, 2014 
Geometry
Triangle ABC has side lengths AB=8, BC=12 and CA=14. Given that D, E and F are midpoints of BC, CA and AB, respectively. Find the value of AD^2+BE^2+CF^2.
asked on June 5, 2013 
Math (Absolute Value Inequality)
Find the maximum value of a such that the following statement is true: If ∣x−8∣
asked on May 26, 2013 
Math (Absolute Value Inequality)
Let a and b be the maximum and minimum value of x, respectively, satisfying the inequality x+19+x−22≤137, then what is a−b?
asked on May 23, 2013 
Math (Absolute Value Inequality)
Find the maximum value of a such that the following statement is true: If ∣x−8∣
asked on May 23, 2013 
Math (Algebra)
For real numbers a and b, if f(x)=x^2−ax+b satisfies f(5+7i)=2a, what is the product of the two roots of the equation f(x)=0?
asked on May 22, 2013 
Math (Algebra)
f(x)=x^4+ax^3+bx^2+cx+d and has real coefficients. If two of the roots are 4−i and 2+3i, what is the value of a+b+c+d?
asked on May 21, 2013 
Math (Algebra)
One root of the quadratic equation x^2 − 2x + m = 0 is 9. If the other root is n, what is n−m?
asked on May 21, 2013 
Math (Percentage)
The price of a hat is reduced by a% from its regular price, and then is raised by a% from the reduced price. If the resulting price is an 81% discount from the regular price, what is a?
asked on May 7, 2013 
Math (Algebra)
If f(x) is a polynomial with real coefficients such that f(7+5i) = 39 + 13i, then f(7−5i) = a + bi. What is the value of a+b?
asked on May 7, 2013 
Math (Algebra)
A and B are real numbers such that the two quadratic equations 13x^2 + 3x +2 = 0 and Ax^2 + Bx + 5 = 0 have a common root. What is the value of A+B?
asked on May 7, 2013 
College Math
Hooke's Law the table shows the distance D that a spring stretches when a weight W is hung on it. W (pounds 2 6 9 15 D (inches) 1.6 4.8 7.2 12 (a.) Do the data represent direct or inverse variation? Explain. (b.) Find an equation that models the data. (c.)
asked on April 28, 2011

Basic Accounting
Dr
posted on September 11, 2016 
Chemistry
Can you show me the solution and result please?
posted on October 17, 2013 
Math
Thanks :)
posted on June 1, 2013 
Math
120 or 180? :)
posted on May 31, 2013 
Math (Absolute Value Inequality)
Thanks MathMate :)
posted on May 26, 2013 
Math (Absolute Value Inequality)
Thanks, but how do I find the value of x?
posted on May 26, 2013 
Math (Algebra)
thanks a lot steve
posted on May 21, 2013 
physics
Thank you drwls :)
posted on June 2, 2012 
English
always talk English, doesn't matter if it's their first or 32234th class
posted on April 14, 2011 
12th grade Trigonometry
theta = 209,55192° theta = 76,70829°
posted on March 4, 2011 
English Grammar
indeed, it is 'just because' .... one of the irregularities of the English language, in some countries, 'I am going to home' is actually common
posted on March 4, 2011 
math
1 foot = 12 inch 1 square foot = 144 square inches not hard now right
posted on February 11, 2011 
Algebra 2
multiply everything by (x4) ==> x+2 + x²(x4) + 6*(x4)=0 ==> x³  4x² + 7x 22 =0 ==> search for 'cardano method' glhf
posted on February 11, 2011 
Algebra
nice ... line
posted on February 11, 2011 
algebra
try to get x or y singled out in the easiest equation (or just pick) fe for the first one : y = 13/5 fe for the second one : x = (2y+9)/2 then fill in that x or y in the other equation fe for the first one : x+(13/5)/2 +30 = 0 fe for the second one :
posted on February 11, 2011 
Algebra
(x + 3)³ = x³+ 3x²3 + 3x3² + 3³ (x  3)³ = x³  3x²3 + 3x3²  3³
posted on February 11, 2011 
calculus
just use the vertex method... f(x) = a*(xb)+h with : a : what we're searching for (initially) f(x) : 1 (from point (1;1)) x : 1 (from point (1;1)) b : x coordinate of the vertex : 1 h : y coordinate of the vertex : 13 => 1 = a*(11)² 13 => a = 10/4
posted on February 11, 2011 
Watershed?
im in flvs 2 lol
posted on August 21, 2008