Math at eNotes
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The latest questions and answers, from members following Math at eNotes.Wed, 1 Oct 2014 00:12:19 PSTen-usThe product of the two given fractions is: `-4/9 xx 7/5 = -28/45` To...
http://www.enotes.com/homework-help/write-3-multiplication-statements-that-have-same-471392
The product of the two given fractions is: `-4/9 xx 7/5 = -28/45` To compose multiplication statements that would result to the same product, we may consider the prime factorization of the numbers present in our product. `28 = 2xx2xx7` `45=3xx3xx5` Hence, some of the multiplication statements that would have the same product as above are: (1) `-2/3xx2/3xx7/5=-28/45` (2) `-2/3xx14/15=-28/45` (3) `-14/3xx2/15=-28/45`http://www.enotes.com/homework-help/write-3-multiplication-statements-that-have-same-471392Wed, 1 Oct 2014 00:12:19 PSTWrite 3 multiplication statements that have the same product as...
http://www.enotes.com/homework-help/write-3-multiplication-statements-that-have-same-471392
Write 3 multiplication statements that have the same product as (-4/9)(7/5).http://www.enotes.com/homework-help/write-3-multiplication-statements-that-have-same-471392#1September 30, 2014, 9:14 pm PSTThe expressions `sqrt 3*(2+sqrt 3)` and `4 - sqrt 3 - 2*(1 - sqrt 3)`...
http://www.enotes.com/homework-help/can-anyone-help-with-circled-quesiton-pic-thanks-453428
The expressions `sqrt 3*(2+sqrt 3)` and `4 - sqrt 3 - 2*(1 - sqrt 3)` have to be expressed in the form `a + b*sqrt 3` `sqrt 3*(2+sqrt 3)` Open the brackets `2*sqrt 3 + sqrt 3*sqrt 3` = `2*sqrt 3 + 3` = `3 + 2*sqrt 3` `4 - sqrt 3 - 2*(1 - sqrt 3)` Open the brackets = `4 - sqrt 3 - 2 + 2*sqrt 3` Simplify = `2 + sqrt 3`http://www.enotes.com/homework-help/can-anyone-help-with-circled-quesiton-pic-thanks-453428Tue, 30 Sep 2014 16:57:33 PSTThe expression (x+2)^2 - 9 has to be factorized. Use the relation a^2 -...
http://www.enotes.com/homework-help/factor-completely-x-2-2-9-453525
The expression (x+2)^2 - 9 has to be factorized. Use the relation a^2 - b^2 = (a - b)(a + b) (x+2)^2 - 9 = (x+2)^2 - 3^2 = (x + 2 - 3)(x + 2 + 3) = (x - 1)(x + 5) The factorized form of (x+2)^2 - 9 is (x - 1)(x + 5)http://www.enotes.com/homework-help/factor-completely-x-2-2-9-453525Tue, 30 Sep 2014 16:51:22 PSTThe product ((2a^2 - 12a + 18)/(3a^2 - 12))*((a^2 + a - 6)/(4a^2 - 36))...
http://www.enotes.com/homework-help/simplify-2a-2-12a-18-3a-2-12-times-2-6-4a-2-36-453685
The product ((2a^2 - 12a + 18)/(3a^2 - 12))*((a^2 + a - 6)/(4a^2 - 36)) has to be found. ((2a^2 - 12a + 18)/(3a^2 - 12))*((a^2 + a - 6)/(4a^2 - 36)) First express all of the terms as products of their factors. `((2a^2 - 12a + 18)/(3a^2 - 12))*((a^2 + a - 6)/(4a^2 - 36))` = `((2a^2 - 6a - 6a + 18)/(3(a^2 - 4)))*((a^2 + 3a - 2a - 6)/(4(a^2 - 9)))` = `((2a(a - 3) - 6(a - 3))/(3(a - 2)(a + 2))*((a(a + 3) - 2(a + 3))/(4(a-3)(a+3))))` = `(2(a - 3)(a...http://www.enotes.com/homework-help/simplify-2a-2-12a-18-3a-2-12-times-2-6-4a-2-36-453685Tue, 30 Sep 2014 16:49:41 PSTThe function f(x) = 2x^2 + 3. To find the expression for f(x - 3),...
http://www.enotes.com/homework-help/f-x-2x-3-where-f-x-3-453841
The function f(x) = 2x^2 + 3. To find the expression for f(x - 3), substitute x with x - 3 in f(x) = 2x^2 + 3 f(x - 3) = 2*(x - 3)^2 + 3 = 2*(x^2 + 9 - 6x) + 3 = 2x^2 + 18 - 12x + 3 = 2x^2 - 12x + 21 The expression for f(x - 3) = 2x^2 - 12x + 21http://www.enotes.com/homework-help/f-x-2x-3-where-f-x-3-453841Tue, 30 Sep 2014 16:40:19 PSTI want to get good grades in math, which I usually do. I love math in...
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I want to get good grades in math, which I usually do. I love math in every single way. I'd prefer Algebra over Geometry anytime. :P To get good grades you can't really study math. You have to do math. For example you can't just read and expect a perfect A. You would need to do it over and over again [not the same problem]. If you run out of problems go online and search for it. We have the internet which consists of majority of everything we...http://www.enotes.com/homework-help/co-ordinate-geometry-408196Tue, 30 Sep 2014 15:05:56 PSTThere is multiple ways to solve this, but I will show you two. Which of...
http://www.enotes.com/homework-help/which-numbers-3-5-3-6-greater-142343
There is multiple ways to solve this, but I will show you two. Which of the numbers 3 / 5 and 3 / 6 is greater? First way to solve this is change the denominator into common denominator By looking at it. Since they both have the same numerator, but one of the denominator is smaller. I will be solving the first way. To find a common denominator you could just simply multiply the 5 by the 6. Making the denominator 30. 5•6=30 /30 /30 Now we...http://www.enotes.com/homework-help/which-numbers-3-5-3-6-greater-142343Tue, 30 Sep 2014 14:53:05 PSTThat symbol stands for less than or equal to. If 1 is less than or equal...
http://www.enotes.com/homework-help/what-x-1-lt-x-471377
That symbol stands for less than or equal to. If 1 is less than or equal to x, you can assume that x can be any value that is greater than 1 or equal to 1. So, x can equal 1, 5, 10, 100, etc. However, x cannot be 0, -2, -5, etc. http://www.enotes.com/homework-help/what-x-1-lt-x-471377Tue, 30 Sep 2014 14:38:08 PST83.7 kg equals to how many grams? Good Question! This question could be...
http://www.enotes.com/homework-help/83-7-kg-equals-how-many-grams-42757
83.7 kg equals to how many grams? Good Question! This question could be answered easily, but I'll get in depth a little. We are using the metric system which is counted by 10s. The metric system consists of Kilo Hecto Deki Unit Deci Centi Milli. To use the metric system you would of course need a unit. A unit can be meter, gram, seconds, any SI unit. SI unit means International System of Units. First of all you need your unit,...http://www.enotes.com/homework-help/83-7-kg-equals-how-many-grams-42757Tue, 30 Sep 2014 14:30:13 PSTThe modulus of a complex number x + i*y is given by `sqrt(x^2 + y^2)`...
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The modulus of a complex number x + i*y is given by `sqrt(x^2 + y^2)` For the complex number z = 1 - 2i, the equivalent values of x and y are 1 and -2 respectively. The modulus of the complex number is `sqrt(1^2 + (-2)^2)` = `sqrt(1 + 4)` = `sqrt 5`http://www.enotes.com/homework-help/what-modulus-z-1-2i-454118Tue, 30 Sep 2014 13:33:43 PSTA man bought a box of 200 apples for $ 500. The price at which each...
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A man bought a box of 200 apples for $ 500. The price at which each apple was bought was 500/200 = $2.5. As ten apples were rotten, he could only sell 190 of them. They were sold at $4 each. The amount received by the man was $760 The profit made was 760 - 500 = 260 As a percentage, the profit was (260/500)*100 = 52%http://www.enotes.com/homework-help/man-bought-box-200-apples-500-10-apples-were-454273Tue, 30 Sep 2014 13:06:28 PSTWhen the graph of a function f(x) is drawn, vertical asymptotes are...
http://www.enotes.com/homework-help/what-vertical-asymptotes-x-x-7-x-3-49x-454394
When the graph of a function f(x) is drawn, vertical asymptotes are points where the value of f(x) goes to `+-oo` . Here is the graph of `f(x) = (x(x-7))/(x^3-49x)` The vertical asymptotes lie at the values of x for which the denominator of the function is equal to 0. f(x) = (x(x-7))/(x^3-49x) = (x(x-7))/(x*(x^2 - 49)) = (x(x-7))/(x*(x - 7)(x+7)) = 1/(x + 7) The denominator of the function is 0 at x = -7 The vertical asymptote of the...http://www.enotes.com/homework-help/what-vertical-asymptotes-x-x-7-x-3-49x-454394Tue, 30 Sep 2014 13:00:29 PSTCoffee A and coffee B are mixed in the ratio x：y by weight. A costs...
http://www.enotes.com/homework-help/coffee-coffee-b-mixed-ratio-x-y-by-weight-costs-50-454853
Coffee A and coffee B are mixed in the ratio x：y by weight. A costs $50/kg and B costs $40/kg. When x kg of A and y kg of B are mixed, the cost of the resulting mixture is (50x+40y)/(x+y). If the cost of A is increased by 10% and the cost of B is decreased by 15%, the cost of the mixture is (x*50*1.1 + y*40*0.85)/(x+y) As the two mixtures cost the same: (50x+40y)/(x+y) = (x*50*1.1 + y*40*0.85)/(x+y) (50x+40y)/(x+y) = (55*x + 34*y) 50x + 40y...http://www.enotes.com/homework-help/coffee-coffee-b-mixed-ratio-x-y-by-weight-costs-50-454853Tue, 30 Sep 2014 12:49:35 PSTIf John gets a 97 on his next math test, his average will be 90. If he...
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If John gets a 97 on his next math test, his average will be 90. If he gets73, his average will be 87. Let the number of test John has already taken be n and let his average in these tests be a. If he get 97 in the next test, the new average is (n*a + 97)/(n+1) = 90 And if he gets 90, the new average is (n*a + 73)/(n+1) = 87 From (n*a + 97)/(n+1) = 90, n*a = 90n + 90 - 97 = 90n - 7 Substitute this in (n*a + 73)/(n+1) = 87 (90n - 7+ 73)/(n+1) =...http://www.enotes.com/homework-help/john-gets-97-his-next-math-test-his-average-will-454958Tue, 30 Sep 2014 12:43:55 PST