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# Recent problems solved by 'MathLover1'

MathLover1 answered: 6612 problems
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 Reduction-of-unit-multipliers/736914: 45 mi/h = ___ ft/s1 solutions Answer 450132 by MathLover1(6614)   on 2013-04-12 17:53:34 (Show Source):
 Linear-systems/736927: use the method of substitution to solve the system of linear equations. 9x+4y=9/4 y=4x-1 The solution is 1 solutions Answer 450057 by MathLover1(6614)   on 2013-04-12 10:38:37 (Show Source): You can put this solution on YOUR website!........eq.1 ........eq.2 ______________________ ........eq.1.......substitute from eq.2 .....solve for ........both sides multiply by now find ........eq.2 see it on a graph:
Graphs/736908: find the equation of the line that contains the point (3,-6) and has the same slope as the line 4x-y=5
1 solutions

Answer 450050 by MathLover1(6614)   on 2013-04-12 08:54:47 (Show Source):
You can put this solution on YOUR website!

to find the equation of the line that contains the point (,) and has the as the line , first find
....solve for
.......this is form ;so, slope is
now find the equation of the line that contains the point (,) and has the slope

 Solved by pluggable solver: FIND a line by slope and one point What we know about the line whose equation we are trying to find out: it goes through point (3, -6) it has a slope of 4 First, let's draw a diagram of the coordinate system with point (3, -6) plotted with a little blue dot: Write this down: the formula for the equation, given point and intercept a, is (see a paragraph below explaining why this formula is correct) Given that a=4, and , we have the equation of the line: Explanation: Why did we use formula ? Explanation goes here. We are trying to find equation y=ax+b. The value of slope (a) is already given to us. We need to find b. If a point (, ) lies on the line, it means that it satisfies the equation of the line. So, our equation holds for (, ): Here, we know a, , and , and do not know b. It is easy to find out: . So, then, the equation of the line is: . Here's the graph:

 Rate-of-work-word-problems/736904: Some work is done by two people in 24 minutes. One of them can do this work alone in 40 minutes. How much time does the second person take to do the same work ? 1 solutions Answer 450049 by MathLover1(6614)   on 2013-04-12 08:47:28 (Show Source): You can put this solution on YOUR website!Let for person to do the job Let the completed A shared work equation: .......reduce the fraction .....multiply both sides by ....time needed for person to do the job alone
 logarithm/736801: Why cant log(base 2) (-8)=x be solved?1 solutions Answer 450010 by MathLover1(6614)   on 2013-04-11 22:57:42 (Show Source): You can put this solution on YOUR website! .......this is a complex solution, there is no real solution for
 logarithm/736802: What is the value of x? 4log(x+6)+3<51 solutions Answer 450009 by MathLover1(6614)   on 2013-04-11 22:35:06 (Show Source): You can put this solution on YOUR website! ......
 Complex_Numbers/736736: Help!!! 2x-11/2 + (-27/2)/(4x-5) ________________________ 3x-19/4 + (-39/4)/(4x-5)1 solutions Answer 449988 by MathLover1(6614)   on 2013-04-11 20:55:24 (Show Source):
 Graphs/736732: graph the line containing the point P and having slope m. P=(-8,4), slope undefined1 solutions Answer 449986 by MathLover1(6614)   on 2013-04-11 20:12:42 (Show Source): You can put this solution on YOUR website!given: =(,), slope The slope of a line is because anything divided by zero is undefined. All you need to do is plot the point and draw a line parallel to y-axis through
 Radicals/736621: I don't understand how to solve this: 12-6(radical sign 9n)=01 solutions Answer 449946 by MathLover1(6614)   on 2013-04-11 17:29:13 (Show Source):
 Rectangles/736542: WHAT IS THE AREA OF THIS RECTANGEL L=7 1/2FT W=5FT 1 solutions Answer 449883 by MathLover1(6614)   on 2013-04-11 13:56:54 (Show Source): You can put this solution on YOUR website! given: ...=>.... then
 Exponential-and-logarithmic-functions/736514: Write an exponential function of the form y=ab^x whose graph passes through the given points. (0,2),(-6,17)1 solutions Answer 449871 by MathLover1(6614)   on 2013-04-11 13:06:50 (Show Source): You can put this solution on YOUR website! an exponential function of the form whose graph passes through the given points (,),(,) you can find if you find first what and is equal to plug in given points in and find .......if (,), then now find .......if (,), and , then ....round it so, your exponential function is:
 Linear_Equations_And_Systems_Word_Problems/736513: how much money will i need for 30 chairs 1 solutions Answer 449869 by MathLover1(6614)   on 2013-04-11 12:48:10 (Show Source): You can put this solution on YOUR website! if one chair cost $then for chairs you need to pay$
 Geometry_Word_Problems/736471: if the circumference of the circle is 42cm what is the length of AB if it is 120 degrees?1 solutions Answer 449868 by MathLover1(6614)   on 2013-04-11 12:45:47 (Show Source): You can put this solution on YOUR website! if the circumferance of the circle is what is the length of if it is degrees? since degrees is of full central angle in the circle, the length of the arc will be of the circumferance of the circle is so,
 Surface-area/736461: How many tiles are needed to cover the floor of a room whose dimensions are 10 feet by 6 feet if the size of each tile is 6 inches by 6 inches? please show the solution. thanks!1 solutions Answer 449840 by MathLover1(6614)   on 2013-04-11 10:14:33 (Show Source): You can put this solution on YOUR website!to cover the floor of a room whose dimensions are by if the size of each tile is by you first calculate the area of a room and the area of a tile let the area of a room be and the area of a tile and to get number of tiles you need to divide by since the units are different, first you will need to convert to or to let's convert to , so the size of each tile is by which is by then now we can divide by ...you will need tiles or covert to : by :
 Circles/736439: What is the area of a circle?1 solutions Answer 449831 by MathLover1(6614)   on 2013-04-11 08:50:12 (Show Source): You can put this solution on YOUR website! The area of a circle is the number of square units inside that circle. To calculate it, you use formula: where is a radius and we use a constant
 Functions/736437: f(x)= (1/x) f(f(f(x)))? 1 solutions Answer 449830 by MathLover1(6614)   on 2013-04-11 08:45:30 (Show Source): You can put this solution on YOUR website! Suppose we have two functions of a variable , 1st is and 2nd ,(we can name it then ....(same as were useing use it as first function and as second so, we have to find
 test/736434: 10y+3=731 solutions Answer 449827 by MathLover1(6614)   on 2013-04-11 08:16:29 (Show Source):
 Vectors/736435: If the domain is {0, 2, -6}, what is the range of y = -2x + 3?1 solutions Answer 449826 by MathLover1(6614)   on 2013-04-11 08:11:51 (Show Source): You can put this solution on YOUR website!If the domain is { , , } (means all values ), you will find the range of if you substitute values in given function: if ...=>......=>... if ...=>......=>......=>... if ...=>......=>......=>... so, the range is: { , , }
 Sequences-and-series/736363: Is 12,40,68,96 sequence geometric or arthmetic? If possible what is the common ratio or difference 1 solutions Answer 449809 by MathLover1(6614)   on 2013-04-11 00:17:18 (Show Source): You can put this solution on YOUR website!For sequences, the common difference is , and the first term is often referred to simply as "". Since you get the next term by adding the common difference, the value of is just . The third term is . The fourth term is . Following this pattern, the term an will have the form . For sequences, the common ratio is , and the first term is often referred to simply as "". Since you get the next term by multiplying by the common ratio, the value of is just . The third term is . The fourth term is . Following this pattern, the term an will have the form . in your case ,,, sequence is have the form common difference is and the greatest common divisor is first term is and if divided by , we get that could be written as starting with and up so, the recursive formula is: and this is sequence
 Polynomials-and-rational-expressions/736355: Solve y+=-51 solutions Answer 449805 by MathLover1(6614)   on 2013-04-10 23:32:37 (Show Source): You can put this solution on YOUR website! ..factor if ...=>... if ...=>...
 Quadratic_Equations/736342: write the roots pf the equation in a+bi form x^2+13=4x1 solutions Answer 449804 by MathLover1(6614)   on 2013-04-10 23:25:33 (Show Source): You can put this solution on YOUR website! ...use quadratic formula solutions: and
 Functions/736264: what is the relationship between x and y if: x=1,2,3,4,5 and y=3.75, 7.5, 11.25, 15, 18.75 1 solutions Answer 449748 by MathLover1(6614)   on 2013-04-10 19:56:04 (Show Source): You can put this solution on YOUR website! take a look at ordered pairs if then if then which is actually if then which is actually if then which is actually if then which is actually so, the relationship between and is: see it on a graph:
 Exponential-and-logarithmic-functions/736150: what is the properties of (x^4)^-3*2x^4 contain only positive exponents1 solutions Answer 449708 by MathLover1(6614)   on 2013-04-10 16:30:23 (Show Source): You can put this solution on YOUR website!..first use negative exponent property ...use a power of a power property ....use a quotient property .....use negative exponent property
 Linear-equations/736110: What is the slope of the line with the equation 2x+3y+6=0?1 solutions Answer 449670 by MathLover1(6614)   on 2013-04-10 13:42:31 (Show Source): You can put this solution on YOUR website! first write in form where is slope and is ...solve for so, the slope of the line with the equation is
 Expressions-with-variables/736104: If x=-3, what is the value of x^2-1/x+1?1 solutions Answer 449668 by MathLover1(6614)   on 2013-04-10 13:37:39 (Show Source): You can put this solution on YOUR website! If , the value of , the you have
 Trigonometry-basics/736099: find expression 2sin^2x+cos2x/secx1 solutions Answer 449666 by MathLover1(6614)   on 2013-04-10 13:29:14 (Show Source): You can put this solution on YOUR website! ............since , we have
 Functions/736070: What is the domain and range of f(x)= -ln(x-1)+21 solutions Answer 449661 by MathLover1(6614)   on 2013-04-10 12:46:23 (Show Source): You can put this solution on YOUR website!.....if , then in that case we will have so, your answer is:
 Equations/736071: Solve the equation for y, show all work: 1/y-2 + 1/15 = -6/3y-61 solutions Answer 449657 by MathLover1(6614)   on 2013-04-10 12:27:24 (Show Source):
 Polynomials-and-rational-expressions/736040: Find the product: 2x(x-1)^31 solutions Answer 449642 by MathLover1(6614)   on 2013-04-10 11:07:32 (Show Source): You can put this solution on YOUR website! ....do first ..now multiply by
 Surface-area/736042: what is 20 cm divided by 5 1 solutions Answer 449640 by MathLover1(6614)   on 2013-04-10 11:00:37 (Show Source):
 Matrices-and-determiminant/735913: Please help me finish this problem Solve the system of equations using matrices. Thank you 3x-y-2z=1 4x+2y+z=5 > 6x-2y-4z=9 3 -1 -2=1 4 2 1 = 5 6 -2 -4=9 R1=(1/3)R1 1 (-1/3) -6=1/3 4 2 1=5 6 -2 -4=9 R2=-4R1+r2 1 (-1/3) -6=(1/3) 0 (10/3) 25=(11/3) 6 -2 -4=9 1 solutions Answer 449608 by MathLover1(6614)   on 2013-04-09 23:15:47 (Show Source): You can put this solution on YOUR website!given: Row operation 1: ....multiply the 1st row by 1/3 => Row operation 2: .........add -4 times the 1st row to the 2nd row...=> Row operation 3: ..............add -6 times the 1st row to the 3rd row=>... Row operation 4: ....multiply the 2nd row by 3/10..=>... Row operation 5: ...........multiply the 3rd row by 1/7...=>... Row operation 6: .....add -11/10 times the 3rd row to the 2nd row...>... Row operation 7: ....add -1/3 times the 3rd row to the 1st row...=>... Row operation 8: matrix( 1, -1 / 3, -2 / 3, 0, 0 , 1 , 11 / 10, 0, 0, 0, 0, 1 ) )}}}.......add 1/3 times the 2nd row to the 1st row....=> matrix( 1, 0 , -3/ 10, 0 0 , 1, 11/ 10 , 0, 0 , 0, 0, 1 ) )}}} so, your solutions ae: , , and