Math at eNotes
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The latest questions and answers, from members following Math at eNotes.Mon, 30 Mar 2015 03:46:08 PSTen-usThere is a slightly more efficient way to find the desired perimeter...
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There is a slightly more efficient way to find the desired perimeter besides finding each of the side lengths of RSQ. Since the triangles are similar, every corresponding length is in the same ratio -- this ratio is the scale factor. Thus perimeter ABD:perimeter RSQ = 7:3. It is easy to compute the perimeter of ABD (77), so to find the perimeter of RSQ solve the proportion `77/p=7/3 ` where p is the perimeter of triangle RSQ. This is important...http://www.enotes.com/homework-help/need-help-with-number-4-dont-understand-all-476151Mon, 30 Mar 2015 03:46:08 PSTIn this question, triangles ABD and RSQ are similar to each other and...
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In this question, triangles ABD and RSQ are similar to each other and similar triangles have a definite proportion of sides. i.e. AB/RS = BD/SQ = AD/RQ = some ratio (given here as 7/3) Since we already are given the length of each side of triangle ABD, we can use the above to get the corresponding side lengths for the triangle RSQ (RS, SQ and RQ). The perimeter of any triangle is the sum of all its sides, which we obtained in previous step....http://www.enotes.com/homework-help/need-help-with-number-4-dont-understand-all-476151#1Mon, 30 Mar 2015 03:31:08 PSTI need help with number 4.i don't understand it at all ,explain it to me.
http://www.enotes.com/homework-help/need-help-with-number-4-dont-understand-all-476151
I need help with number 4.i don't understand it at all ,explain it to me.http://www.enotes.com/homework-help/need-help-with-number-4-dont-understand-all-476151#2March 30, 2015, 3:13 am PSTThe volume of any prism can be calculated using the formula `V = h*B` ,...
http://www.enotes.com/homework-help/okay-im-having-trouble-answering-this-math-problem-476122
The volume of any prism can be calculated using the formula `V = h*B` , where h is the height of the prism and B is the area of the prism. In this problem, the base is a right isosceles triangle. The area of such triangle will be `B = 1/2 a^2` , where a is the length of the equal sides. So in our case, the volume of the prism will be `V = 1/2 ha^2` Since the length of the equal sides is given in centimeters, but the volume of the prism is...http://www.enotes.com/homework-help/okay-im-having-trouble-answering-this-math-problem-476122Sun, 29 Mar 2015 19:29:15 PSTOkay, so I'm having trouble answering this math problem. Here we go: The...
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Okay, so I'm having trouble answering this math problem. Here we go: The base of a right triangular prism is a right isosceles triangle whose equal sides measure 25 cm each. The volume of the prism is 0.075 cubic meters. Find the height of the prism.http://www.enotes.com/homework-help/okay-im-having-trouble-answering-this-math-problem-476122#3March 29, 2015, 7:07 pm PSTThe above answer is one way to solve it. You can also make a proportion...
http://www.enotes.com/homework-help/maximum-amount-picture-hook-can-hold-5-kilograms-475847
The above answer is one way to solve it. You can also make a proportion to make it easier to solve. `1/1000g=x/4600g` The 1 is the 1 kg. The x is how many kgs are in 4600 grams. Since we have to make both units the same, we can cross multiply and solve. `4600=1000x` `4600/1000` `x=4.6` Since the hook can hold at most 5 kgs and we found the answer to be 4.6 kgs, then Yes Jamie can hang the picture. ` `http://www.enotes.com/homework-help/maximum-amount-picture-hook-can-hold-5-kilograms-475847Sun, 29 Mar 2015 00:27:00 PSTIf you think of it as objects, it is easier to figure out. Suppose you...
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If you think of it as objects, it is easier to figure out. Suppose you have 9 pencils on a table. And you put 10 more on the table. You have added 10 to the 9 pencils already there. Now there is a total of 19. You can also see it like this: 9= 1+1+1+1+1+1+1+1+1. There are 9 ones. 10= 1+1+1+1+1+1+1+1+1+1 There are 10 ones. If you add up all the ones, you get 19.http://www.enotes.com/homework-help/what-9-10-475825Sat, 28 Mar 2015 18:20:18 PST(5x^2 + 10x - 75)/(4x^2 -24x - 28) * (2x^2 - 10x - 28)/(x^2+7x + 10) The...
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(5x^2 + 10x - 75)/(4x^2 -24x - 28) * (2x^2 - 10x - 28)/(x^2+7x + 10) The key to this is factoring! Let do it equation by equation then re write the expression towards the end. (5x^2 + 10x - 75) This entire expression is divisible by 5 so lets take out 5 5(x^2 + 2x - 15) Now we will factor this equation. What multiples of 15 will you get that when subtract or added gives you two? Lets see 5x3=15 also 5-3=2. 5 and -3 are your answers lets plug...http://www.enotes.com/homework-help/simplify-expression-5x-2-10x-75-4x-2-24x-28-2x-2-476017Sat, 28 Mar 2015 15:45:50 PST`(-y^5z^7)/(y^2z^5)` `In this case, you must determine what bases are...
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`(-y^5z^7)/(y^2z^5)` `In this case, you must determine what bases are alike. you have y to the 5th power, which means you have y*y*y*y*y in the numerator. You have y to the 2nd power in the denominator y*y. You can cancel these out as values of 1 (y divided by y is equal to 1), or simply subtract these exponents. ` <span class="AM"></span> ` `y^5 -y^2 = y^3` you are left with `y^3` for the numerator. You must now simplify your...http://www.enotes.com/homework-help/simplify-y-5-z-7-y-2-z-5-475854Sat, 28 Mar 2015 15:24:36 PSTThe first thing you must do is check your bases. Are these like bases?If...
http://www.enotes.com/homework-help/what-value-r-makes-y-28-y-3r-y-7-true-475855
The first thing you must do is check your bases. Are these like bases?If so, check the operation. In this case you are multiplying. If you are multiplying, you can simply add the exponents together and keep the bases the same. Because of this rule, you can simplify this question to : 28 = 3r + 7 Use inverse operations to subtract 7 from both sides. 21 = 3r Divide both sides by 3 to isolate the r variable. 21/3 = 3r/3 7 = r In this case, your...http://www.enotes.com/homework-help/what-value-r-makes-y-28-y-3r-y-7-true-475855Sat, 28 Mar 2015 15:16:49 PST` ` The quickest way that you can determine if something is a linear...
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` ` The quickest way that you can determine if something is a linear function is by looking at the variables given. If you do not have exponents greater than 1 for either variable, you can determine that it will be a linear function. f(x)= -6x+3 In this case, f(x) can be replaced merely with y. You have y = -6x + 3. Because both of the variable terms are in the 1st degree, this will be a linear function. Examples of non-linear functions for...http://www.enotes.com/homework-help/problem-f-x-6x-3-what-can-help-me-detirmine-475896Sat, 28 Mar 2015 15:09:47 PST2a+3b+4a in this case, you want to combine your like terms (those with...
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2a+3b+4a in this case, you want to combine your like terms (those with the same variable). You have 2a + 4a and 3b. Because 2a and 4a are both "a" terms, you may combine them into 6a. 6a+3b At this point, you can either leave your answer as it is, or factor out a 3. 3(2a + b) Using knowledge of the distributive property, you can factor a 3 out of the equation and simplify it for future use, although this is not necessary given the question...http://www.enotes.com/homework-help/2a-3b-4a-475915Sat, 28 Mar 2015 15:02:14 PST1) Use inverse operations to add 16 to both sides of the equation. + 16...
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1) Use inverse operations to add 16 to both sides of the equation. + 16 +16 2) Take the square root of both sides. `x^4 = 16` 3) Simplify your square roots. `sqrt(x^4)=sqrt(16)` `x^2 = 4 or -4` 4) Take the square root again of both sides. `x = 2 and x =sqrt(-4)` or 2i if simplified because it is an imaginary number.http://www.enotes.com/homework-help/find-all-solutions-real-imaginary-x-4-16-0-476015Sat, 28 Mar 2015 14:57:06 PSTThe formula for a circle is (x-h)^2 + (y-k)^2 = r^2 (h,k) is the center...
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The formula for a circle is (x-h)^2 + (y-k)^2 = r^2 (h,k) is the center of the circle. In this example, touching the x-axis also means the x axis is tangent to the circle, where y = 0. This also means it is perpendicular to the radius. And, the perpendicular/radius runs through the center of the circle, aka where x = 4. Since y = 0 at this point, it touches at (4,0) as well as r = 2. So, the formula would be (x-4)^2 + (y-2)^2 = 2^2...http://www.enotes.com/homework-help/circle-touches-x-axis-has-its-centre-point-4-2-476040Sat, 28 Mar 2015 11:54:55 PST(a) (i) A circle touches the x-axis and has its centre at the point...
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(a) (i) A circle touches the x-axis and has its centre at the point (4,2). Write down the equation of this circle. (ii) Confirm that the point (3 , 2 + 3) is on the circlehttp://www.enotes.com/homework-help/circle-touches-x-axis-has-its-centre-point-4-2-476040#4March 28, 2015, 11:23 am PST