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# Recent problems solved by 'sofiyac'

Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719, >>Next

 Linear-equations/474547: Solve using the elimination method. -5x - 7y = 25.5 -2x + 10y = -91 solutions Answer 325435 by sofiyac(695)   on 2011-07-26 12:24:07 (Show Source): You can put this solution on YOUR website!-5x - 7y = 25.5 multiply first one by 2, second one by -5 and add them -2x + 10y = -9 *** -10x-14y=51 10x-50y=45 ------------ -64y=96 divide each side by -64 y=-1.5 plug it into one of the original equations and solve for x -2x + 10y = -9 -2x + 10*(-1.5) = -9 -2x-15=-9 -2x=6 divide each side by -2 x=-3 solution is (-3,-1.5)
 Polynomials-and-rational-expressions/474548: Factor the following expression into a product of two binomials 121x^2-132x+361 solutions Answer 325434 by sofiyac(695)   on 2011-07-26 12:20:35 (Show Source):
 Polynomials-and-rational-expressions/474549: Completely factor the following expression 25a^2-60ab+36b^21 solutions Answer 325433 by sofiyac(695)   on 2011-07-26 12:19:37 (Show Source):
 Inequalities/473079: 12. Solve this compound inequality, showing all work. Graph the solution on the number line and express the answer using interval notation. X Y1 Y2 -3 -2 8 -2 0 5 -1 2 2 0 4 -1 1 6 -4 2 8 -7 3 10 -10 3v+7≤2v+5 or 4v+1≤6v-5 −4 −3 −2 −1 0 1 2 3 4 5 Interval Notation: __________________1 solutions Answer 324413 by sofiyac(695)   on 2011-07-22 13:12:15 (Show Source): You can put this solution on YOUR website! or or or or (-infinity, -2] or [3, +infinity)
 Rectangles/473107: A rectangle has an area of 48 square feet and a perimeter of 32 feet. Which of the following could be its dimensions?1 solutions Answer 324412 by sofiyac(695)   on 2011-07-22 13:07:08 (Show Source): You can put this solution on YOUR website!you didn't list the options xy=48 2x+2y=38 solve for x and y
 Rectangles/473123: The length of a table is 3 m greater than the width. The area is 70 m^2. Find the dimensions of the table1 solutions Answer 324410 by sofiyac(695)   on 2011-07-22 13:06:05 (Show Source): You can put this solution on YOUR website!width is x length is x+3 area=length*width 70=x(x+3) 70=x^2+3x 0=x^2+3x-70 measure can't be negative for length and width so we have to go with + option so width is 7, then length is 7+3=10
 Travel_Word_Problems/473124: Driving at 42 mph one covers 19 miles in?1 solutions Answer 324407 by sofiyac(695)   on 2011-07-22 13:02:13 (Show Source): You can put this solution on YOUR website!distance=rate*time time=distance/rate time=19/42=0.45 hours about half hour
 test/471569: Graph function f by starting with y=x^2 f(x)= -x^2-101 solutions Answer 323435 by sofiyac(695)   on 2011-07-18 16:34:37 (Show Source):
 Complex_Numbers/470082: 1 solutions Answer 322887 by sofiyac(695)   on 2011-07-15 16:21:56 (Show Source): You can put this solution on YOUR website! or
 Length-and-distance/469786: Find EF.1 solutions Answer 322884 by sofiyac(695)   on 2011-07-15 16:16:03 (Show Source): You can put this solution on YOUR website!That's not enough information
 Polynomials-and-rational-expressions/470157: I am taking math 4106-1 Factoring and algebraic fractions and I am soooo lost i get some of the formulas but just done know when to use them Please help me!1 solutions Answer 322883 by sofiyac(695)   on 2011-07-15 16:15:11 (Show Source): You can put this solution on YOUR website!you have to post the problem that you would like help with, or i can tutor you privately if you'd like to pay via paypal, thanks
 test/469772: Find (f•g)(x) and (g•1 solutions Answer 322882 by sofiyac(695)   on 2011-07-15 16:14:02 (Show Source): You can put this solution on YOUR website!directions aren't finished
 Evaluation_Word_Problems/469747: Hi please help with this equation... Solve for X 1.)X(exponent 2)-3X-10=01 solutions Answer 322881 by sofiyac(695)   on 2011-07-15 16:12:43 (Show Source): You can put this solution on YOUR website! a=1 b=-3 c=-10 or
 Probability-and-statistics/469730: 1 solutions Answer 322879 by sofiyac(695)   on 2011-07-15 16:08:53 (Show Source): You can put this solution on YOUR website!nothing posted
 Linear-equations/469738: determine the slope of the line passing through each pair of points. 1. (1,4) (2,7) 2. (-2,4) (5,-10) 3. (-3,6) (-3,8) 4 (-4,6) (-6,-1)1 solutions Answer 322878 by sofiyac(695)   on 2011-07-15 16:08:27 (Show Source): You can put this solution on YOUR website!1. (1,4) (2,7) so the slope is 3 use the same formula for the rest of the points, same steps just different numbers
 Quadratic_Equations/469744: 1. y>-2+3 2.2x-2y less than 6 3.-y<-x 4. x more than 5 4x+3y more than 61 solutions Answer 322877 by sofiyac(695)   on 2011-07-15 16:06:50 (Show Source): You can put this solution on YOUR website!1. y>-2+3 y>1 2.2x-2y less than 6 (not sure what we're supposed to do here) 2x-2y<6 3.-y<-x y>x this would be the simplified version 4. x more than 5 x>5 4x+3y more than 6 4x+3y>6
 Graphs/470701: graph the soultion set: 4x+5y>101 solutions Answer 322876 by sofiyac(695)   on 2011-07-15 16:02:36 (Show Source): You can put this solution on YOUR website!4x+5y>10 5y>10-4x y>2-(4x/5) shade the line UP and the line will be DOTTED not solid
 Equations/470491: 5+m\7=101 solutions Answer 322848 by sofiyac(695)   on 2011-07-15 13:53:05 (Show Source): You can put this solution on YOUR website!m/7=5 m=35
 test/470466: Find the product: 4x(x2 + 5x – 7) a. 4x3 + 20x2 – 28x b. 5x3 + 9x2 – 3x c. 4x2 + 20x – 28 d. 4x3 + 5x –7 1 solutions Answer 322847 by sofiyac(695)   on 2011-07-15 13:48:12 (Show Source): You can put this solution on YOUR website!a)
 Probability-and-statistics/470440: why would you keep outliers in an data entry about high temperatures?1 solutions Answer 322846 by sofiyac(695)   on 2011-07-15 13:46:00 (Show Source): You can put this solution on YOUR website!you want to know whta the record temperatures were
 Graphs/470674: A straight line passes through the points (2,2) and (0,2). If we want to express the line equation in the form Ax-C=By Find the values of A,B and C. 1 solutions Answer 322845 by sofiyac(695)   on 2011-07-15 13:44:49 (Show Source): You can put this solution on YOUR website! y-y1=m(x-x1) plug in your m and one of the points, doesn't matter which y-2=0(x-0) y-2=0 y=2 i think you copied wrong it's ax+by=c so a=0 b=1 c=2
 Exponential-and-logarithmic-functions/470412: Solve the system by the addition or substitution method. x - 6y = -46 -3x - 7y = -621 solutions Answer 322842 by sofiyac(695)   on 2011-07-15 13:40:42 (Show Source): You can put this solution on YOUR website! x - 6y = -46 -3x - 7y = -62 multiply first one by 3 and add to second one *** 3x - 18y = -138 -3x - 7y = -62 add them ************ -25y=-200 divide each side by -25 y=8 plug into either of the equations x-6*8=-46 x-48=-46 x=2 (2,8)
 Inequalities/470671: Solve the inequality, graph the solution set on the real number line, and then write the solution in interval notation. 1 solutions Answer 322841 by sofiyac(695)   on 2011-07-15 13:30:38 (Show Source): You can put this solution on YOUR website!(thanks for writing it correctly) cross multiply move x's to one side everything else to the other divide both sides by 11
 Geometry_Word_Problems/470670: I am not sure how to set the problem up i keep tryingg but i cant get the right anwser. Im also not sure how to convert the feet to miles How many hours will it take a bicyclist travling at 17.6 feet per second to finish a 90 mile race?1 solutions Answer 322840 by sofiyac(695)   on 2011-07-15 13:26:55 (Show Source): You can put this solution on YOUR website!1 miles = 5280 feet 1 hour = 3600 seconds 90/12=7.5 hours
 Numbers_Word_Problems/470622: The sum of two consecutive numbers is 6 more than three times their difference. find the two numbers1 solutions Answer 322839 by sofiyac(695)   on 2011-07-15 13:21:45 (Show Source): You can put this solution on YOUR website!first number x, second one x+1 x+x+1-6=3(x+1-x) 2x-5=3 2x=8 x=4 so first one is 4 second one is 4+1=5
 Percentage-and-ratio-word-problems/470604: In 2004, 41.2 million people were enrolled in Medicare, an increase of 5.1% from 2000. How many people were enrolled in Medicare in 2000? 1 solutions Answer 322837 by sofiyac(695)   on 2011-07-15 13:19:36 (Show Source): You can put this solution on YOUR website!In 2004, 41.2 million people were enrolled in Medicare, an increase of 5.1% from 2000. How many people were enrolled in Medicare in 2000? percent million 105.1----41.2 100--------x so 105.1 percent would be 41.2 and 100 percent would be x, cross multiply and solve for x 105.1x=4120 x=39.2 million
 Rectangles/470666: the perimeter of a rectangle is 40ft. The ratio of the width to length is 2:3. How do you find the length and the width?1 solutions Answer 322835 by sofiyac(695)   on 2011-07-15 13:16:42 (Show Source): You can put this solution on YOUR website!2x+2y=40 10y=120 y=12 so the sides are 12 and 8
 Equations/470668: How do I simplify this equation by factoring? Here is the link to the image, as I don't know how to type it out. http://www.flickr.com/photos/53982956@N07/5940260063/1 solutions Answer 322834 by sofiyac(695)   on 2011-07-15 13:10:27 (Show Source): You can put this solution on YOUR website!the image doesn't come up
 expressions/470585: What is the algebraic expresesion for these three question the quoitent of the square of a number t and 14 and the product of 6 and the quanity 2 more than a number x is at least 45 and three times the sum of 4 and number y squared is the same as differnece of 14 and the number y1 solutions Answer 322832 by sofiyac(695)   on 2011-07-15 13:09:04 (Show Source): You can put this solution on YOUR website!can't tell where the first question ends and second begins, repost all separately, thanks
 Probability-and-statistics/470565: a final exam in statistics course has a mean of 84 and a standanrd deviation of 4 find the corresponding z-score for each raw score a.99 b.76 c.80 1 solutions Answer 322831 by sofiyac(695)   on 2011-07-15 13:07:19 (Show Source):
 Graphs/470564: Graph the function below by using its exponential form. f(x)=log1.2^x 1 solutions Answer 322830 by sofiyac(695)   on 2011-07-15 13:06:38 (Show Source): You can put this solution on YOUR website!we can't graph using logs on this website