Math at eNotes
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The latest questions and answers, from members following Math at eNotes.Wed, 23 Apr 2014 22:37:31 PSTen-us45 is 93% of what? Write algebraically: 45 = (93/100)x = .93x x =...
http://www.enotes.com/homework-help/45-93-317133
45 is 93% of what? Write algebraically: 45 = (93/100)x = .93x x = 45/.93 x = 48.387....http://www.enotes.com/homework-help/45-93-317133Wed, 23 Apr 2014 22:37:31 PST(1) 3x+y=5 (2) -x+2y=-4 Rewrite both: (1) y = 5 - 3x (2) y = (x -...
http://www.enotes.com/homework-help/solve-by-graphing-1-3x-y-5-x-2y-4-2-2x-y-1-2x-y-5-289340
(1) 3x+y=5 (2) -x+2y=-4 Rewrite both: (1) y = 5 - 3x (2) y = (x - 4)/2 Graph: We can see that they intersect at point (2, -1) which is your solution. http://www.enotes.com/homework-help/solve-by-graphing-1-3x-y-5-x-2y-4-2-2x-y-1-2x-y-5-289340Wed, 23 Apr 2014 22:35:47 PSTStatistics obviously comes to mind: weighted averages, averages, mode,...
http://www.enotes.com/homework-help/what-types-maths-used-football-297597
Statistics obviously comes to mind: weighted averages, averages, mode, median, and range. If you are looking at the motion of the football then Newtonian Mechanics from physics with some basic algebra skills can help you determine velocity, velocity upon impact, the parabolic trajectory, and the amount of force necessary to always score from a certain distance. http://www.enotes.com/homework-help/what-types-maths-used-football-297597Wed, 23 Apr 2014 22:32:48 PSTSome helpful things to keep in mind are: --Isolate the variable you...
http://www.enotes.com/homework-help/can-somebody-give-me-steps-how-go-about-doing-201953
Some helpful things to keep in mind are: --Isolate the variable you are solving for to one side--Try to get rid of addition/subtraction before moving on to multiplication/division--for particularly difficult derivations sometimes squaring both sides of an equation can help you solve for the desired variable. --Don't give up!http://www.enotes.com/homework-help/can-somebody-give-me-steps-how-go-about-doing-201953Wed, 23 Apr 2014 22:29:36 PSTIf y=7.5 when x=0.5, find y when x=-0.3 You can set up proportions: ...
http://www.enotes.com/homework-help/y-7-5-when-x-0-5-find-y-when-x-3-117463
If y=7.5 when x=0.5, find y when x=-0.3 You can set up proportions: `(.5)/(7.5) = (-0.3)/(y)` `.5y = -2.25` `y = -2.25 /.5` `y = -4.5` `` ` `http://www.enotes.com/homework-help/y-7-5-when-x-0-5-find-y-when-x-3-117463Wed, 23 Apr 2014 22:24:38 PSTThe ordered pair (2, 36) is a solution for which equation(s)? x = 2 is a...
http://www.enotes.com/homework-help/ordered-pair-2-36-solution-which-equation-s-115215
The ordered pair (2, 36) is a solution for which equation(s)? x = 2 is a vertical line equation that satisfies this condition. (But its not a function!) y = 36 is a horizontal line equation that satisfies this condition. For linear functions: y - 36 = m(x - 2) for any real m. http://www.enotes.com/homework-help/ordered-pair-2-36-solution-which-equation-s-115215Wed, 23 Apr 2014 22:22:00 PSTDirect variation means y varies directly with x. As y goes up; x goes...
http://www.enotes.com/homework-help/write-an-equation-direct-variation-that-includes-82291
Direct variation means y varies directly with x. As y goes up; x goes up. So y = kx for some unknown k. We can solve for this k using the point given (-3, -14) Plug in x and y: -14 = -3k Solve for k -14/-3 = k Simplify k = 14/3 So the function is: f(x) = (14/3)x http://www.enotes.com/homework-help/write-an-equation-direct-variation-that-includes-82291Wed, 23 Apr 2014 22:16:57 PST4x^2 - 8x + 4 = 0 divide everything out by 4 x^2 - 2x + 1 = 0 Its a...
http://www.enotes.com/homework-help/4x2-8x-4-0-solve-by-factoring-342771
4x^2 - 8x + 4 = 0 divide everything out by 4 x^2 - 2x + 1 = 0 Its a perfect square which equals ( x - 1)^2 Set that equal to 0 and solve. (x - 1)^2 = 0 x - 1 = 0 x = 1http://www.enotes.com/homework-help/4x2-8x-4-0-solve-by-factoring-342771Wed, 23 Apr 2014 18:00:07 PSTc=(ab) / (a+b) Get rid of the fraction: c (a + b) = ab ac + bc = ab...
http://www.enotes.com/homework-help/solve-c-ab-b-275078
c=(ab) / (a+b) Get rid of the fraction: c (a + b) = ab ac + bc = ab Distributive Property ac - ab = -bc Isolating the variable we want to one side a (c - b) = = -bc a = -bc / (c-b)http://www.enotes.com/homework-help/solve-c-ab-b-275078Wed, 23 Apr 2014 17:56:56 PST250% of ? is 50 250% in decimal form is 2.5 Rewrite: 2.5x = 50 x =...
http://www.enotes.com/homework-help/250-50-317142
250% of ? is 50 250% in decimal form is 2.5 Rewrite: 2.5x = 50 x = 50/2.5 x = 20http://www.enotes.com/homework-help/250-50-317142Wed, 23 Apr 2014 17:53:05 PSTRewrite your equation as a function of x: Get everything onto one...
http://www.enotes.com/homework-help/solve-x-2-squared-2-6-by-graphing-164931
Rewrite your equation as a function of x: Get everything onto one side: x^2 + 2 - 6 = x^2 - 4. Graph this equation (as I've done above) and find the zeroes. Which in this case are -2 and 2. Those are your solutions. http://www.enotes.com/homework-help/solve-x-2-squared-2-6-by-graphing-164931Wed, 23 Apr 2014 17:51:45 PSTab + b= a+ 2c, what is the value of b when a=2 and c=3 solve for b: b...
http://www.enotes.com/homework-help/ab-b-2c-what-value-b-when-2-c-3-320249
ab + b= a+ 2c, what is the value of b when a=2 and c=3 solve for b: b (1 + a) = a + 2c (Distributive Property) solve for b: b = ( a + 2c ) / (1 + a) Plug in our a and c values into this new equation to figure out what b is equal to. b = (2 + 6)/ (1 + 2) = 8/3http://www.enotes.com/homework-help/ab-b-2c-what-value-b-when-2-c-3-320249Wed, 23 Apr 2014 17:46:50 PST(+5)(-4)(+3)(-2)(+1) Ignoring signs, just multiply all the numbers...
http://www.enotes.com/homework-help/what-answer-5-4-3-2-1-there-any-tips-tricks-doing-333110
(+5)(-4)(+3)(-2)(+1) Ignoring signs, just multiply all the numbers out: 5 x 4 x 3 x 2 x 1 = 120 (Side note: this is also called 5!) In the original we have two negative numbers and three positive numbers. Keep in mind that order does not matter for multiplication and that two negative numbers multiplied together gives a positive number. So a (neg x neg) x pos x pos x pos ..which is all equal to a positive number. so the answer is equal...http://www.enotes.com/homework-help/what-answer-5-4-3-2-1-there-any-tips-tricks-doing-333110Wed, 23 Apr 2014 17:44:53 PST6-2x / 2x-6 = -1 `(6-2x)/(2x-6)` `(-1(-6+2x))/(2x-6)`...
http://www.enotes.com/homework-help/know-that-solution-6-2x-2x-6-1-but-dont-132255
6-2x / 2x-6 = -1 `(6-2x)/(2x-6)` `(-1(-6+2x))/(2x-6)` `(-1(2x-6))/(2x-6)` `-1` ``The -1 factors out.http://www.enotes.com/homework-help/know-that-solution-6-2x-2x-6-1-but-dont-132255Wed, 23 Apr 2014 17:40:15 PSTA. The equation `x^2=2 ` has no solution in Z8 is true....
http://www.enotes.com/homework-help/one-following-two-propositions-true-other-false-468404
A. The equation `x^2=2 ` has no solution in Z8 is true. `0^2=0-=0("mod"8) ` `1^2=1-=1("mod"8)` `2^2=4-=4("mod"8) ` `3^2=9-=1("mod"8) ` `4^2=16-=0("mod"8) ` `5^2=25-=1("mod"8) ` `6^2=36-=4("mod"8) ` `7^2=49-=1("mod"8) ` This exhausts all possibilities, thus there is no integer x such that `x^2=2 ` in Z8. B. `n^3-n^2+n+5 ` has a remainder of 1 on division by 5 for all positive integers n; this is false. Let n=4: then `n^3-n^2+n+5=4^3-4^2+4+5=57...http://www.enotes.com/homework-help/one-following-two-propositions-true-other-false-468404Wed, 23 Apr 2014 17:40:01 PST