







Solve sinX=0.703X for X 
20180313 

PARAM pose la question : sinX=0.703X Penny Nom lui répond. 





2^x= 2x  11 
20161127 

Kathy pose la question : I don't know how to start this problem:
2^x= 2x  11 Penny Nom lui répond. 





The height of a parabolic arc 
20151230 

Tom pose la question : Is there an algebraic means to determine the highest point of a parabolic arc if the base and perimeter are known? Penny Nom lui répond. 





The positive root of sin(x) = x^2 
20151213 

Kemboi pose la question : Find the positive root of the equation sin(x) = x^2 Penny Nom lui répond. 





x  2 Sin[x] = 0 
20140508 

chanmy pose la question : please help me to sole this equation x  2 Sin[x] = 0,thank you Penny Nom lui répond. 





n log n = 36 * 10 ^ 12 
20131112 

shihab pose la question : How to find value of n in this equation :
n log n = 36 * 10 ^ 12 Penny Nom lui répond. 





Sinx=logx+x^2 
20121128 

yasmin pose la question : Sinx=logx+x^2 Harley Weston lui répond. 





Using Newton's Method to find a root 
20120409 

Nancy pose la question : Use Newton's method to find the real root function, accurate to five decimal places
f(x) = x^5+2x^2+3 Penny Nom lui répond. 





A logarithmic equation 
20100908 

Rohit pose la question : x^2 + k*ln(x)  c  k = 0
Where k and c are constants. Penny Nom lui répond. 





Arc length and Chord length 
20100313 

Darryl pose la question : Is there a formula to determine the chord length of an arc knowing only the arc length and the arc depth (sagitta)? I know you can't find the radius with only these two inputs, but can you find the chord length? Harley Weston lui répond. 





Cooling 
20100307 

Lori pose la question : If a house is always at 20 degrees celsius.
Water (tea) boils at 100 degrees celsius.
5 minutes later the tea was 70 degrees celsius.
Use an equation to predict the temperature after 20 minutes. Tyler Wood lui répond. 





541.39(1 + i)^15 = 784.09 
20091014 

Fitore pose la question : Hi, I noticed that this question was already posted up, however I was hoping I could solve it without having to use logs. Can you please help me? The equation is:
541.39(1 + i)^15 = 784.09 Penny Nom lui répond. 





Find the central angle 
20090818 

Larissa pose la question : In a circle, the length of a chord AB is 4 cm and the length of the arc AB is 5 cm. Find the central angle theta, in radians, correct to four decimal places. Then give the answer to the nearest degree. I think I'm supposed to use Newton's method, but am not sure how to start with this problem. Harley Weston lui répond. 





What is so important about quadratics? 
20081129 

zoe pose la question : what is so important about quadratics? Harley Weston lui répond. 





Estimate the cube root of 270 
20080311 

Tom pose la question : (a) By plotting suitable graphs, estimate to one decimal place the cube root of 270.
(b) With reference to your answer to part (a), use 8 iterations of a Bisection Search to refine your estimate. Use the nearest whole numbers either side of your estimate from part (a) as starting values.
(c) Using either of your starting values from part (b) as first guess, use the NewtonRaphson method to find the true value of the root (to 6 decimal places). Repeat using the other starting value from part (b) and compare the two results. Harley Weston lui répond. 





How would one find the radius? 
20071229 

Ned pose la question : Given an arc with length of 192 inches (don't know chord length),
and arc height of 6 inches, how would one find the radius? Stephen La Rocque and Harley Weston lui répond. 





Solve sin(x)=x^2x 
20071211 

ming pose la question : is there anyway you can solve
sin(x)=x^2x without a calculator? Stephen La Rocque lui répond. 





0 = (1/t)  [ln(1+r) ln(t)] 
20071018 

Brandi pose la question : Objective: solve for t, where r = 0.05
0 = (1/t)  [ln(1+r) ln(t)] Penny Nom lui répond. 





Principia Mathematica 
20070412 

victoria pose la question : i need help making a poster on emilie du chatelet a great mathematician can you describe
the newton principia because i know that she worked on it
thanks,
victoria Stephen La Rocque and Penny Nom lui répond. 





x^x = 2x 
20070222 

ramsay pose la question : This has been bugging me for ages. How do find both real solutions to x^x = 2x? Obviously I have x=2, and there's another at about 0.35, but I can't work it out properly. Any help? Penny Nom lui répond. 





Newton meters and ftlbs 
20061104 

Michael pose la question : What is the correlation between Newton meters and ftlbs of torque? If an engine has 100ftlbs of torque,what would that equate to in Newton meters? Stephen La Rocque lui répond. 





Computing gravity 
20060927 

Patricia pose la question : What is the gravity of planet z in inch/hr squared if the weight of an element with mass of 45000 oz on planet z is 2N? Stephen La Rocque lui répond. 





The area of a sector and a triangle 
20060623 

Howard pose la question : I thought of the following problem which is similar but much simpler than the tethered goat problem: What is the angle(it is more illustrative in degrees)of arc of a unit circle so that the area between the chord it subtends and the arc length is equal to the area of the triangle with opposite side the subtended chord. Stephen La Rocque and Penny Nom lui répond. 





The interior angles of a right triangle 
20060520 

Greg pose la question : I am wondering if there is a way to figure out the interior angles of a right triangle if we know ONLY the side lengths, and the trick is, we CANNOT use arctangent! Leeanne Boehm and Penny Nom lui répond. 





Square roots and inequalities 
20041025 

Waheed pose la question : Q1. What is the simplest way of finding a square root of any number using just a pen and paper? (I am asking this question because I browsed a few sites a didn't find any method that is simpler than the one I use. so I am just curious.)
Q2. Is it possible that you take an equation and turn it into an inequality by performing same mathematical operations on both sides? Claude Tardif and Penny Nom lui répond. 





Newton's binomial theorem 
20030830 

William pose la question : According to page 126 of Murtha & Willard's "Statistics and Calculus" (PrenticeHall, 1973), Newton's binomial theorem can proved inductively. I suppose that was his method, which I would like to see. Penny Nom lui répond. 





Rolling 5 sevens before rolling a six or an eight 
20020120 

Tony pose la question : When rolling 2 dice, what is the probability of rolling 5 sevens before rolling a six or an eight? Andrei Volodin and Penny Nom lui répond. 





Solving x  sin(x) = constant 
20001229 

Keith Roble pose la question : If x is in radians, how do you solve for x, where: xsin(x) = constant? Harley Weston lui répond. 

