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# Recent problems solved by 'checkley77'

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 Quadratic_Equations/204683: f(x)=2x squared1 solutions Answer 154494 by checkley77(12569)   on 2009-07-29 09:31:10 (Show Source): You can put this solution on YOUR website!f(x)=2x squared (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, 2x^2).
 Numbers_Word_Problems/204692: This question is from textbook Algebra 1 find two consecutive odd integers such that twice the lager is 17 more than the smaller1 solutions Answer 154493 by checkley77(12569)   on 2009-07-29 09:27:23 (Show Source): You can put this solution on YOUR website!Let x & x+2 be the 2 integers. 2(x+2)=x+17 2x+4=x+17 2x-x=17-4 x=13 ans. for the smaller integer. 13+2=15 ans. for the larger integer. Proof: 2*15=13+17 30=30
 Probability-and-statistics/204412: A bag contains 2 green, 9 brown, 7 yellow and 4 blue marbles. once a marble is selected, it is not replaced. find each probability. 1)p(brown, then yellow) 3)P(yellow, then yellow) 5 P(green, then not blue)1 solutions Answer 154322 by checkley77(12569)   on 2009-07-27 14:59:14 (Show Source): You can put this solution on YOUR website!9/22*7/21=63/462=.136=13.6% chance of a brown then a yellow selection. 7/22*6/21=42/462=.09=9% chance of a yellow then a yellow selection. 2/22*17/21=34/462=.0736=7.36% chance of a green & then not a blue.
 Linear-systems/204405: 3x-3y=3 2x+y=21 solutions Answer 154321 by checkley77(12569)   on 2009-07-27 14:51:18 (Show Source): You can put this solution on YOUR website!3x-3y=3 2x+y=2 multiply by 3 & add. 6x+3y=6 3x-3y=3 --------------- 9x=9 x=9/9 x=1 ans. 3*1-3y=3 3-3y=3 -3y=3-3 -3y=0 y=0/-3 y=0 ans. Proof: 2*1+0=2 2=2
 Probability-and-statistics/204347: A card is selected from a deck of 52 playing cards. Find the probability of selecting a) a seven given the card is a not a face card. (An ace is not a face card.) b) a spade given the card is red. 1 solutions Answer 154318 by checkley77(12569)   on 2009-07-27 14:43:20 (Show Source): You can put this solution on YOUR website!4/(52-16)=4/36=1/9=.1111=11.11% chance of selecting a 7. 26/0 not possible.
 Probability-and-statistics/204348: One card is selected at random from a standard 52-card deck of playing cards. Find the probability that the card selected is a jack. 1 solutions Answer 154308 by checkley77(12569)   on 2009-07-27 14:03:59 (Show Source): You can put this solution on YOUR website!Probability=(number of successes)/(total outcomes) P=4/52=1/13=.076923=7.6923% chance of selecting a jack.
 Rate-of-work-word-problems/204387: It takes Jon 7 hours to paint a room. It takes Kate 12 hours to paint the same room. How many hours will it take them to paint the room if they work together?1 solutions Answer 154306 by checkley77(12569)   on 2009-07-27 13:58:28 (Show Source): You can put this solution on YOUR website!(7*12)/(7+12)=84/19=4.421 hours working together will finish the job.
 Probability-and-statistics/204390: This question is from textbook The telephone prefix for a university is 243. THe prefix is followed by four digits. How many telephones are pssible before a new prefix is needed?1 solutions Answer 154305 by checkley77(12569)   on 2009-07-27 13:56:24 (Show Source): You can put this solution on YOUR website!10*10*10*10=10,000 is the max. number of 4 digit numbers for the 243 prefix.
 Travel_Word_Problems/204392: A freight train leaves a station travelling at 30 mph A passenger train leaves 1 hours later travelling at 50 mph. At what time will the passenger train overtake the freight train? 1 solutions Answer 154303 by checkley77(12569)   on 2009-07-27 13:53:38 (Show Source): You can put this solution on YOUR website!30t=50(t-1) 30t=50t-50 30t-50t=-50 -20t=-50 t=-50/-20 t=2.5 hours after the freight train leaves the station they will meet.
 Probability-and-statistics/204394: This question is from textbook Radio stations in the United States have call letters that begin with either K or W. Some ahve three letters; others have four letters. How many sets of three letter call letters are possible? How many sets of four letter call letters are possible?1 solutions Answer 154302 by checkley77(12569)   on 2009-07-27 13:49:31 (Show Source): You can put this solution on YOUR website!2*26=52 3 letter stations. 2*26*26=1,352 4 letter stations.
 Probability-and-statistics/204395: This question is from textbook Carlin's Pizza House offers 3 kinds of salad, 15 kinds of pizza and 4 kinds of dessert. How many different three course meals can be ordered?1 solutions Answer 154301 by checkley77(12569)   on 2009-07-27 13:46:12 (Show Source): You can put this solution on YOUR website!3*15*4=180 combinations are possible.
 Probability-and-statistics/204396: This question is from textbook License paltes in a certain state have three letters followed by threee digits. How many different plates are possible if no repititions of letters or numbers are allowed?1 solutions Answer 154300 by checkley77(12569)   on 2009-07-27 13:44:41 (Show Source): You can put this solution on YOUR website!26*25*24*10*9*8=11,232,000 combinations.
 Parallelograms/204400: This word problem is: A parallelogram has a base of length of x+6 and a height of x+2 and an area of 60 unit. find the base and height of the parallelogram? My best guess is that x=4 because 4+6=10 and 4+2=6 and then 10 x 6 = 60 <-- area but i do not know how to show the work?!?1 solutions Answer 154299 by checkley77(12569)   on 2009-07-27 13:42:25 (Show Source): You can put this solution on YOUR website!(x+6)(x+2)/2=60 (x^2+8x+12)/2=60 x^2+8x+12=60*2 x^2+8x+12-120=0 X^2+8X-108=0 x=(-8+-sqrt[8^2-4*1*-108])/2*1 x=(-8+-sqrt[64+432])/2 x=(-8+-sqrt496)/2 x=(-8+22.271)/2 x=(-8+22.271)/2 x=14.271/2 x=7.1355 7.1355+6=13.1355 ans. for the base. 7.1355+2=9.1355 ans. for the height. Proof: (7.1355+6)(7.1355+2)/2=60 (13.1355*9.1355)/2=60 120/2=60 60=60
 Rectangles/204253: Find an algebraic expression The perimeter of a rectangle, given that the length is x yards and the width is 10 yards shorter 1 solutions Answer 154229 by checkley77(12569)   on 2009-07-26 16:16:23 (Show Source): You can put this solution on YOUR website!P=2W+2L P=2(X-10)+2X P=2X^2-20+2X P=2X^2+2X-20
 Polynomials-and-rational-expressions/204263: Factor the polynomial completely. Problem: h^2 -9hs +9s^2 =1 solutions Answer 154228 by checkley77(12569)   on 2009-07-26 16:10:59 (Show Source): You can put this solution on YOUR website!h^2 -9hs +9s^2 Using the quadratic equation: we get. h=(9+-sqrt[-9^2-4*1*9])/2*1 h=(9+-sqrt[81-36])/2 h=(9+-sqrt45)/2 h=(9+-6.7082)/2 h=(9+6.7082)/2 h=15.7082/2 h=7.8541 h=(9-6.7082)/2 h=(2.2918/2 h=1.1459 (h-7.8541s)(h-1.1459s) ans.
 Equations/204278: Could you please help me factor a trinomial?? 7v^2-14v-56 Thank you for your help!!1 solutions Answer 154224 by checkley77(12569)   on 2009-07-26 15:53:25 (Show Source): You can put this solution on YOUR website!7v^2-14v-56 (7v-28)(v+2) ans.
 Miscellaneous_Word_Problems/203830: In the 2004 Presidential election, Ryan stuffed fliers into envelopes for the candidate he supported. He worked from 2:10 P.M. to 4:40 P.M. and completed 360 envelopes. At what rate did Ryan stuff the envelopes? 1 solutions Answer 153968 by checkley77(12569)   on 2009-07-23 15:49:11 (Show Source): You can put this solution on YOUR website!360/2.5=144 envelopes per hour.
 Functions/203847: list the coordinates of three other points that are on the same line as (-2,14) and (17,-5).1 solutions Answer 153967 by checkley77(12569)   on 2009-07-23 15:46:34 (Show Source): You can put this solution on YOUR website!(-2,14) and (17,-5). Y=mX+b where m=slope & b=the Y intercept. slope=(y2-y1)/(x2-x1) slope=(-5-14)/(17+2) slope=-19/19 slope=-1 14=-1*-2+b 14=2+b b=14-2 b=12 the y intercept. Y=-X+12 ans. (graph 300x200 pixels, x from -6 to 15, y from -10 to 15, -x +12).
 Linear-equations/203997: Graph the following. A. x + 3y = − 6 b. 3x − 2y = 8 1 solutions Answer 153965 by checkley77(12569)   on 2009-07-23 15:32:32 (Show Source): You can put this solution on YOUR website!A. x + 3y = − 6 3y=-x-6 y=-x/3-6/3 y=-x/3-2 (red line) b. 3x − 2y = 8 -2y=-3x+8 y=-3x/-2+8/-2 y=3x/2-4 (green line) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -x/3 -2 and -3x/2 -4).