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30 articles trouvés pour ce sujet.

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	Four consecutive positive integers		2019-03-12
		Nabila pose la question : The product of four consecutive positive integers in 24024 What is their sum? Penny Nom lui répond.
	Positive and negative values of a function		2018-01-30
		Grayson pose la question : f(x)=x^6-x^4 Interval: ( negative infinity, negative one ) Test Value: negative two Function Value f(x): positive forty eight Interval: ( negative one, zero ) Test Value: negative one Function Value f(x): zero Interval: ( zero, positive one ) Test Value: positive one Function Value f(x): zero Interval: ( positive one, positive infinity ) Test Value: positive two Function Value f(x): positive forty eight What is the sign of f(x) for each Interval? Penny Nom lui répond.
	Two consecutive positive integers		2015-03-01
		meha pose la question : Find two consecutive positive integers , sum of whose squares is 365. Penny Nom lui répond.
	A proof by contraposition		2012-10-19
		Rahul pose la question : I am not able to understand the following, To prove that if for all e>0, |x|0, then |x|>=e. I understand the approach very well but I do not understand why if |x|=e then |x|>=e. If it is so then why not |x|= Thanks in advance!' Rahul. Penny Nom lui répond.
	The test for some disease is 99% accurate		2010-02-24
		baaba pose la question : Assume that the test for some disease is 99% accurate. If somebody tests positive for that disease, is there a 99% chance that they have the disease? Chris Fisher lui répond.
	4-digit positive numbers		2010-02-15
		marjon pose la question : Find the sum of all the 4-digit positive numbers with no zero digit. Penny Nom lui répond.
	The intervals where the function is positive and negative		2010-01-10
		Ron pose la question : Hello I'm trying to find out the intervals where the function is positive and negative. It's for a polynomial function y= -(x+2)^2 (x-2) and y= (x+1)(x+4)(x-3) I have tried the right and left side of each x-intercepts, but I still don't understand the results thank you for your help Penny Nom lui répond.
	A number base that's not a positive integer		2009-12-11
		Nick pose la question : Is it possible for a number to have a base that's not a positive integer? Base 1 gives a result that's meaningless but possible. I have no concept of a base 0, a negative base, or a fractional base, never mind any other base. I think there isn't any base that's not a positive integer, but, knowing that math keeps jumping ahead and sometimes has inventions before anyone knows how to exploit them, I think I'd better ask. Thank you. Nick Robert Dawson and Claude Tardif lui répond.
	Percent increase from a negative number to a positive number		2009-04-21
		Brian pose la question : I have no problem calculating year over year net profits but am having trouble when it comes to a negative. 2007 Net Profit = -110,333.00 2008 Net Profit = 66,054.00 Brian Harley Weston lui répond.
	Comparing positive and negative fractions		2009-03-24
		Christyrose pose la question : Hello. I am a sixth grade math student and i need help on how to compare negative and positive fractions. Here is is: 3/4 -2/3 7/10 -5/6 I'm not sure how to do the negative parts because i was absent for a couple days. Thank you! Christyrose Penny Nom lui répond.
	A product of positive and negative numbers		2008-10-03
		kaylou pose la question : Suppose you were given 13 numbers and asked to find their product. Seven of the numbers were positive, and the rest were negative. Would your product be positive or negative? Why? Penny Nom lui répond.
	Right Sided Limit of an Exponential Function		2008-07-29
		joseph pose la question : I am trying to find the limit as X approaches 0 from the positive side of x to the sin of x which look like this lim x^sinx x->0+ Harley Weston lui répond.
	Three consecutive positive integers		2008-07-20
		AC pose la question : find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 4 times the third Penny Nom lui répond.
	Probability of H.I.V. tests		2007-05-07
		Danielle pose la question : A medical test detects H.I.V. Among those who have H.I.V., the test will detect the disease with probability 0.95; among those who do NOT have H.I.V., the test will falsely claim that H.I.V. is present with probability 0.0125. Among those who take this test, 4% have H.I.V. The test is given to Lucille, and indicates that she has H.I.V. What is the probability that Lucille actually has H.I.V.? Stephen La Rocque lui répond.
	A proof by contraposition		2006-03-16
		Eban pose la question : 1)by mathematical induction prove that 12 + 32 + 52 + ...... + (2k-1)2 = (1/3)k(2k-1)(2k+1) for all positive integers k. 2)show that the contrapositive of the following statement is true. if 1 + M7 is even, then M is odd. Stephen La Rocque lui répond.
	Whole numbers		2005-10-10
		Kirk pose la question : Can the sum of two or more whole numbers be less than any of those numbers? Penny Nom lui répond.
	Adding positive and negative numbers		2005-09-03
		Billy pose la question : 46 + -24 = -38 + -22 = 19 - 20 = Penny Nom lui répond.
	Strategies for teaching operations with positive and negative decimal numbers		2005-02-02
		Erin pose la question : I am wondering if you can suggest any strategies for teaching operations with positive and negative decimal numbers that do not rely on rules that must be memorized? Diane Hanson lui répond.
	An isosceles triangle		2005-01-03
		Abraham pose la question : The question is,"Triangle ABC is not isosceles.Prove that if altitude BD were drawn, it would not bisect AC."My question is If an altitude is drawn wouldn\'t that mean automatically its isosceles because, In a triangle the sides opposite congruent angles(in this case the right angles)are congruent? What am I thinking wrong? Harley Weston lui répond.
	The sum of some positive integers		2004-06-07
		A student pose la question : Find the sum of all positive integers not greater than 10000 that are divisible by neither 3 nor 7. Penny Nom lui répond.
	Positive, negative and zero		2003-09-04
		Brian pose la question : Can the Value of zero be positive or can it be negative or can it be both. Penny Nom lui répond.
	Three consecutive positive intergers		2003-02-09
		Yew pose la question : Prove that when we multiply any consecutive positive intergers, the result is always divisible by 6. ex. (7)(8)(9) = 504 = 6 (84) Penny Nom lui répond.
	Negative times negative is positive		2001-10-26
		Mary pose la question : I have a question about adding and multiplying positive and negative numbers. When we add two negative numbers the answer is negative BUT when we multiply two negative numbers the answer is positive. I don't understand. Why? Penny Nom lui répond.
	A sequence of even terms		2001-04-29
		A student pose la question : A sequence c is defined recursively as follows: c0 = 2 c1 = 4 c2 = 6 ck= 5ck-3 for all integers Prove that cn is even for all integers. Leeanne Boehm and Penny Nom lui répond.
	False Positives		2000-10-29
		James pose la question : A rare disease infected 1 in 1000 people in the population. A test for the disease is accurate 99% of the time when given to an infected person and also when given to a heathy person. Fill out a two-tier tree diagram and find the probability of the false positive(i.e the conditional probabily of being healty even when tested postive by the test) Comment on the result? ... Penny Nom lui répond.
	(mn + m + n)/(m^2 + n^2) = 1		2000-07-24
		William pose la question : Find all pair of positive integers m and n such that mn + m + n divides m2 + n2 = 1. Peny Nom lui répond.
	Natural numbers		2000-04-12
		Sara pose la question : What is a natural number??? Penny Nom lui répond.
	Whole numbers		1999-12-02
		Patty pose la question : I'm in a 5th grade class, please explaine what whole numbers are..... Penny Nom lui répond.
	Is zero positive?		1999-09-03
		Shah pose la question : Is zero a positive integer? Penny Nom lui répond.
	Division by a negative		1999-08-19
		Sangeeta B. pose la question : 56/-8 Penny Nom lui répond.

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