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checkley77 answered: 12560 problems
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Quadratic_Equations/204683: f(x)=2x squared 1 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 smaller 1 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=2 1 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).

Equations/204028: Hi, could you please help me with factoring? 14a^2-33ad+18d^2 Thank you so much!! 1 solutions Answer 153964 by checkley77(12569)   on 2009-07-23 15:27:47 (Show Source): You can put this solution on YOUR website! 14a^2-33ad+18d^2 (7a-6d)(2a-3d) ans.

Miscellaneous_Word_Problems/203848: Two angles are complementary. One angle is 18 degrees less than twice the other. Find the angles. 1 solutions Answer 153849 by checkley77(12569)   on 2009-07-22 16:27:04 (Show Source): You can put this solution on YOUR website! x+2x-18=90 3x=90+18 3x=108 x=108/3 x=36 ans. for the smallewr angle. 90-36=54 ans. for the larger angle. Proof: 36+2*36-18=90 36+72-18=90 90=90

Inequalities/203878: 3x+4>7 1 solutions Answer 153846 by checkley77(12569)   on 2009-07-22 16:22:03 (Show Source): You can put this solution on YOUR website! 3x+4>7 3x>7-4 3x>3 x>3/3 x>1 ans. Proof: Let x=1.1 3*1.1+4>7 3.3+4>7 7.3>7

Numeric_Fractions/203883: Could you please help me solve this 7/8 +1/9 / 8/9 1 solutions Answer 153845 by checkley77(12569)   on 2009-07-22 16:18:56 (Show Source): You can put this solution on YOUR website! 7/8 +1/9 / 8/9 7/8+1/9*9/8 7/8+1/8=8/8=1 ans.

Rectangles/203913: If the perimeter of a rectangle is 50 feet, and one of the sides is 10 feet, find the length of the other side. 1 solutions Answer 153842 by checkley77(12569)   on 2009-07-22 16:15:02 (Show Source): You can put this solution on YOUR website! 2*10+2x=50 20+2x=50 2x=50-20 2x=30 x=30/2 x=15 ans. for the other side.

Money_Word_Problems/203460: Debbie pays 15% of her taxable income of $34,200 in taxes. How much of her income will go to education and social service? 1 solutions Answer 153654 by checkley77(12569)   on 2009-07-20 15:51:44 (Show Source): You can put this solution on YOUR website! .15*34,200=$5130 ans.

Linear_Equations_And_Systems_Word_Problems/203619: This question is from textbook the ten's digit of a number is 5 times the unit's digit. what is the number? 1 solutions Answer 153652 by checkley77(12569)   on 2009-07-20 15:44:29 (Show Source): You can put this solution on YOUR website! 00 or 51 ans.

Coordinate-system/203621: -x+5y=-15 1 solutions Answer 153650 by checkley77(12569)   on 2009-07-20 15:42:34 (Show Source): You can put this solution on YOUR website! -x+5y=-15 5y=x-15 y=x/5-15/5 y=x/5-3 (graph 300x200 pixels, x from -6 to 15, y from -10 to 10, x/5 -3).

Polynomials-and-rational-expressions/203635: Simplify : (s^3)^4/(s^2)^3 1 solutions Answer 153649 by checkley77(12569)   on 2009-07-20 15:38:34 (Show Source): You can put this solution on YOUR website! (s^3)^4/(s^2)^3 s^12/s^6 s^(12-6) s^6 ans.

Age_Word_Problems/203512: a cyclist traveled at at rate of 32 mph to visit a nearby town. The cyclist averaged 10 mph on the return trip. If the trip took 6.3 hours, find the distance to the nearby town. 1 solutions Answer 153565 by checkley77(12569)   on 2009-07-19 17:40:11 (Show Source): You can put this solution on YOUR website! D=RT OR T=D/R X/32+X/10=6.3 (10X+32X)/(10*32)=6.3 42X/320=6.3 42X=6.3*320 42X=2,016 X=2,016/42 X=48 MILES IS THE DISTANCE TO THE NEARBY TOWN. PROOF: 48/32+48/10=6.3 1.5+4.8=6.3 6.3=6.3

Square-cubic-other-roots/203538: √(3/2) - √(2/3) I dont get this i tried and i get √(30)/6 but the answer says its wrong. 1 solutions Answer 153564 by checkley77(12569)   on 2009-07-19 17:29:39 (Show Source): You can put this solution on YOUR website! sqrt(3/2)-sqrt(2/3) sqrt1.5-sqrt.6667 1.2247-.8165=.4082 ans.

Travel_Word_Problems/203545: If a space probe travels 100 kilometers per second for 12 years, how far will it travel? 1 solutions Answer 153563 by checkley77(12569)   on 2009-07-19 17:22:27 (Show Source): You can put this solution on YOUR website! 100*60*60*24*365*12=3.78432*10^10 kilometers. km/sec/min/hrs/days/yrs