







y = f(x) 
20181230 

yogita pose la question : What is the actual meaning of "f(x)" ? Please give me full explanation Penny Nom lui répond. 





Solve the equation completely cos 2x = 1 
20170608 

Lava pose la question : Solve the equation completely cos 2x = 1 Penny Nom lui répond. 





2^a, 2^b, 1^1 and 1^0 
20170317 

Émile pose la question : If you had 2^a = 4 and 2^b = 4 you could assume that a = b right? Yet we can observe that 1^1 and 1^0 both equal 1, yet 1 = 0 isn't true. So if given a log base 1 number 1 the would the answer be 1 AND 0? Penny Nom lui répond. 





x^2 = 16 
20161212 

A student pose la question : x to the second power = 16
what number solves the equation? Penny Nom lui répond. 





y = mx + c and Ax + By + C = 0 
20161018 

Erick pose la question : please explain to me how to convert an equation from the form y=mx+c to Ax+By+C=o form. Penny Nom lui répond. 





A tangent to y = x^3 
20150531 

Brayden pose la question : Show that a tangent line drawn to the curve y=x^3 at the point (d,f (d)), where d>0, forms a right triangle with the x and y axes in quadrant 4 whose area is (2/3)d^4. Penny Nom lui répond. 





sin x = cos x 
20150123 

Mubashir pose la question : there are two curves y=sinx and y=cosx intersecting at point where x is less than 90 and greater than 0.to find the point I made a equation sinx=cosx
but donot know what to do further .please help me by solving this equation sinx=cosx
also tell me that have you solved this equation by reference to the graph or by other means please do elaborate your solution in your answer. Penny Nom lui répond. 





Solve sin3x = cos2x 
20140714 

Emanuel pose la question : If sin3x=cos2x, find the value of x when x<0<90' Penny Nom lui répond. 





The slope of the line y=2x+5 
20131229 

victoria pose la question : what is the slope of the line with the equation y=2x+5 Penny Nom lui répond. 





Solve x = ln(x) 
20130719 

Udayan pose la question : Sir/Madam,
How to find the solutions of the equation,
x = ln(x) Penny Nom lui répond. 





How can we draw the equation "x+y=1" in 3d? 
20130503 

shimaa pose la question : how can we draw the equation "x+y=1" in 3d Robert Dawson lui répond. 





A chart for y=mx+b 
20130311 

jacinda pose la question : how to make a chart for y=mx+b Penny Nom lui répond. 





Plotting y=f(x)+2 
20130121 

Gavin pose la question : how would you plot y=f(x)+2 Penny Nom lui répond. 





An equation of the form y=mx 
20120417 

Samiya pose la question : what would be an equation of the form y=mx with the points (2, 6) and (1, 3) for the line? Penny Nom lui répond. 





The equation of a line 
20120326 

Danielle pose la question : Hello, could you help me figure out what the equation of the line is in the form of Ax+By=C with the points (2,0) and (0,3)?
Thank You! Penny Nom lui répond. 





A line tangent to f(x)=1/x 
20110605 

Michael pose la question : A line tangent to f(x)=1/x in the first quadrant creates a right triangle
with legs the xaxis and the yaxis. Prove that this triangle is always
2 square units regardless of where the point of tangency is. Penny Nom lui répond. 





If ac = bc ... 
20110104 

jamielle pose la question : if ac=bc, then a is not equal to b, c is not equal to zero Penny Nom lui répond. 





Reflection in the line y = x 
20100721 

tousif pose la question : Find the 2 x 2 matrix which represents a reflection in the line y = x?
Please help.... Penny Nom lui répond. 





1^3 + 2^3 + 3^3 +4^3 ... n^3 = ? 
20100129 

ireimaima pose la question : Hi..
Can u please help me with this question..
I find that when i test eg: n=2 for n (n+1) /4,
it seems that it does not giving me the right answer of 1^3 + 2^3 = 9
but 3/2... i'm confuse..can u please help me..thanks so much
Prove that:
1^3 + 2^3 + 3^3 +4^3………………………………..n^3 = n (n+1) /4 Penny Nom lui répond. 





x^x = 1 
20090828 

Waleed pose la question : x^x=1 Robert Dawson lui répond. 





A word problem involving y = mx + b 
20090424 

Devon pose la question : I need to put the following question in to y=mx+b form
I rent a gym for $150.00 for 30 students. Another time I rent the gym for @270.00 for 70 students. I need to also find a fixed rate. Stephen La Rocque lui répond. 





The graph of y = 4x^4 
20090407 

lyric pose la question : tell whether the graph opens up or down.write an equation of the axis of symmetry
y=4x^4 Penny Nom lui répond. 





A line parallel to a given line 
20090218 

Lisa pose la question : I'm having a hard time understanding the concept of how to write an
equation of the line containing the given points and parallel to the given line.
Express the answer in the form of y=mx+b.
(7,9); 2x+5y=4. i would appreciate it alot if someone can show ne how
to do this. Thank you, Lisa Penny Nom lui répond. 





Plotting a function 
20071206 

Paula pose la question : My son has a problem that says plot the point:
2x3y=9
I have explained to him that there must be a function for y in order to plot that point, but he doesn't think so. The question above that one says find the function for y, and I assume we should use that function. Am I wrong? Can we plot a point without a y function. Stephen La Rocque lui répond. 





y=mx+b 
20070529 

molly pose la question : Im having a problem with the y=mx+b for our homework we have a table that goes from 0 to 6 , 1 to 7 and 2 to 8 and we have to make a equation of that. Please help. Penny Nom lui répond. 





A riddle 
20031119 

Sarah pose la question : Ok, our teacher gave us this riddle, and I cannot for the life of me figure it out. He said that there are three problems with the following proof: Penny Nom lui répond. 





1 = 0.999... 
20010413 

Joan pose la question : I have a middle grade math question for you. I would like to know why .9999... = 1 ? I can not use algebra to show this or the following: We agree that 2 = 2 and that 22 = 0, so
1.00000...... 0.99999.....  0.000000...... and 0.000... = 0 therefore 0.9 = 1 OR 1/3 = 0.333333 and 3 X 1/3 = 1, so if 3 X 0.333... = 0.999... then 0.999... = 1 My teacher says that I can not use the above example to show why this is true, and that I must use a couple different examples. He says that there are several other ways. Do you know any? I could really use the help because I can't think of any other ways to show this is true. Thanks for any help you can give. Penny Nom lui répond. 

