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# Recent problems solved by 'edjones'

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 Geometry_Word_Problems/356108: Please someone help me. I am trying to help my 7th grader with is algebra 1 homework. Here is the problem. The width of a rectangle is one half its length. The perimeter of the rectangle is 24 inches. What are the width and length of the rectangle?1 solutions Answer 254241 by edjones(7569)   on 2010-10-14 00:32:09 (Show Source): You can put this solution on YOUR website!w=L/2 L=2w P=24" P=2L+2w 2*2w+2w=24 Substitute 2w for L 6w=24 w=4" L=8" . Ed
 Linear-systems/356127: y-9>2y-2 are 1, -14, -17, -3 soultions1 solutions Answer 254239 by edjones(7569)   on 2010-10-14 00:24:49 (Show Source): You can put this solution on YOUR website!y-9>2y-2 -y>7 y<-7 . Ed
 Probability-and-statistics/356140: two out of three females under the age of 25 have used hair coloring. If a random sample of 15 females under the age of 25 is drawn, find the probability that 10 have used hair-coloring products.1 solutions Answer 254236 by edjones(7569)   on 2010-10-14 00:16:11 (Show Source): You can put this solution on YOUR website!(x+y)^15 Let x=2/3 and y=1/3 nCr=15C10=3003 3003*x^10*y^5=.2143 Probability EXACTLY 10 out of 15 have used hair-coloring products. . Ed
 test/356161: K= 2b + 5c; solve b then solve c. I am very rusty in algebra. My son and I are getting different answers and he doesn't have his book so I can refresh my memory. Can you work this out so we can get and example to finish the others? Thank you. 1 solutions Answer 254233 by edjones(7569)   on 2010-10-14 00:02:07 (Show Source): You can put this solution on YOUR website!k=2b+5c . solve for b. k-2b=5c -2b=5c-k b=(5c-k)/-2 b=-(5c-k)/2 b=(k-5c)/2 . solve for c. k-5c=2b -5c=2b-k c=(2b-k)/-5 c=-(2b-k)/5 c=(k-2b)/5 . Ed
 Probability-and-statistics/356147: 65% of the students in a certain small college’s population are women. It is also noted at this college that women are twice as likely to take Poetry as men. In one semester 30% of the college’s women take Poetry. If a randomly selected college student is in a Poetry class, what is the probability that this student is a female?1 solutions Answer 254230 by edjones(7569)   on 2010-10-13 23:51:12 (Show Source): You can put this solution on YOUR website!.65 F & .35 M Students .30 F & .15 M take poetry . .65*.30=.195 F taking poetry .30*.15=.0525 M taking poetry . .195+.0525=.2475 student body taking poetry. . .195/.2475=.7879 probability student is female. . Ed
 Probability-and-statistics/356122: Suppose that 4% of all adults over 40 have diabetes. A certain physician correctly diagnoses 95% of all adults over 40 with diabetes as having the disease and incorrectly diagnoses 3% of all adults over 40 without diabetes as having the disease. 8) Draw a tree diagram and label it with appropriate probabilities. 9) Find the probability that a randomly-selected adult over 40 is diagnosed as not having diabetes. 10) Find the probability that a randomly-selected adult over 40 actually has diabetes, given that he/she is diagnosed as not having diabetes.1 solutions Answer 254221 by edjones(7569)   on 2010-10-13 23:16:33 (Show Source): You can put this solution on YOUR website!Note: I rounded all calculations to 3 decimal places. .95*.04=.038 of population correctly diagnosed as diabetic. .03*.96=.029 of pop. incorrectly diagnosed as diabetic. . 9) 1-.038-.029=.933 probability that a randomly-selected adult over 40 is diagnosed as not having diabetes by this physician. . 10) .002/(.931+.002)=.002/.933=.002 probability that a randomly-selected adult over 40 actually has diabetes, given that he/she is diagnosed as not having diabetes. . Ed
 Exponents/356113: how to you factor 5x^2+34x+241 solutions Answer 254186 by edjones(7569)   on 2010-10-13 21:52:43 (Show Source): You can put this solution on YOUR website!5x^2+34x+24 5*24=120 2 factors of 120 whose sum is 34 are 4 and 30 5x^2+4x+30x+24 =x(5x+4)+6(5x+4) Factoring by grouping. =(x+6)(5x+4) . Ed
 Functions/356096: Please help! I don't understand this problem at all. Find the domain of the function f(x) = 3 + √(36-x^2 )/x^2- 9 Please show all work Thank you!1 solutions Answer 254183 by edjones(7569)   on 2010-10-13 21:44:12 (Show Source): You can put this solution on YOUR website!f(x) = (3 + sqrt(36-x^2 ))/(x^2- 9) . The denominator cannot equal zero. x^2-9=(x+3)(x-3) (x+3)(x-3)=0 x=3, x=-3 So x cannot equal -3 or 3. The domain of x is all real numbers except -3 and 3. . Ed .
 Linear_Equations_And_Systems_Word_Problems/356094: John is the place kicker for his college football team. Last season he kicked 38 times and never missed. Each field goal scored 3 points and each point after touchdown scored 1 point. If he scored a total of 70 points, how many field goals did John kick last season?1 solutions Answer 254181 by edjones(7569)   on 2010-10-13 21:32:37 (Show Source): You can put this solution on YOUR website!Let f=number of field goals and a=number of points after. a+f=38 a+3f=70 . a+3f=70 a+ f=38 -------subtract 2f=32 . f=16 field goals he kicked last season. . Ed
 test/356098: 1<2A-5<13 (A+4)(A-4) (A-7)(3A-4) (3A-7)(2A-9) A^2-81 A^2-4-21 2A^2-11A+12 |A+2|=9 |A-7|=151 solutions Answer 254176 by edjones(7569)   on 2010-10-13 21:18:27 (Show Source): You can put this solution on YOUR website!(A+4)(A-4)=A^2-16
 test/356090: |3c-6|>3. Is the absolute value 3c+6 or 3c-6?1 solutions Answer 254175 by edjones(7569)   on 2010-10-13 21:16:24 (Show Source): You can put this solution on YOUR website!|3c-6|>3 . 3c-6>3 3c>9 c>3 . 3c-6<-3 3c<3 c<1 . Ed
 Rational-functions/356092: How do you find the average speed of an object. For example: Fly 1200 miles in 4 hours. Thank you for your help.1 solutions Answer 254171 by edjones(7569)   on 2010-10-13 20:59:55 (Show Source): You can put this solution on YOUR website!1200/4=300 mph
 Probability-and-statistics/356004: Rework problem 15 from section 3.5 of your text involving a true-false test. Assume that 20 questions are answered by guessing. What is the probability of exactly 15 correct answers?1 solutions Answer 254169 by edjones(7569)   on 2010-10-13 20:58:59 (Show Source): You can put this solution on YOUR website!Let x=.5 and y=.5 nCr=20C15=15504 15504x^15y^5=.0148 probability of exactly 15 correct answers. . Ed
 Travel_Word_Problems/356014: Silvano traveled to the lake and back. On the trip there he traveled 80 km/h and on the return trip he went 60 km/h. How long did the trip there take if the return trip took 4 hours?1 solutions Answer 254164 by edjones(7569)   on 2010-10-13 20:49:39 (Show Source): You can put this solution on YOUR website!4*60=240 km 240/80=3 hrs Time that the trip there took.
 Geometry_Word_Problems/356077: find the area of a rectangle with the base of 73 centimeters and height of 3 meters1 solutions Answer 254159 by edjones(7569)   on 2010-10-13 20:39:51 (Show Source): You can put this solution on YOUR website!.73 * 3 = 2.19
 Numeric_Fractions/356080: 3/4 times 15/321 solutions Answer 254158 by edjones(7569)   on 2010-10-13 20:38:02 (Show Source): You can put this solution on YOUR website!3/4 * 15/32 =45/128 21/64 . Ed
 Numeric_Fractions/356078: Solve the equation 7 + d/6 =191 solutions Answer 254156 by edjones(7569)   on 2010-10-13 20:36:28 (Show Source): You can put this solution on YOUR website!7 + d/6 =19 42+d=114 d=72 . Ed
 Percentage-and-ratio-word-problems/356063: A board that cost six dollars is 9 and 1/4 feet long. One-third of the board is cut off. Now what is the length of the piece cutt off?1 solutions Answer 254155 by edjones(7569)   on 2010-10-13 20:34:24 (Show Source): You can put this solution on YOUR website!9 1/4 = 37/4 37/4 * 1/3 = 37/12 ft The length of the piece cut off. . Ed
 Quadratic_Equations/356041: solve by completing the square x^2-10x=111 solutions Answer 254151 by edjones(7569)   on 2010-10-13 20:22:35 (Show Source): You can put this solution on YOUR website!x^2-10x=11 x^2-10x+25=11+25 (x-5)^2=36 x-5=+-6 x=5+-6 x=11, x=-1 . Ed
 Travel_Word_Problems/356055: how far would you travel in 2.4 hours at 25 mph?1 solutions Answer 254147 by edjones(7569)   on 2010-10-13 20:15:35 (Show Source): You can put this solution on YOUR website!25*2.4=60mi
 Equations/356049: what's the solution to a + 5 = -5z + 51 solutions Answer 254141 by edjones(7569)   on 2010-10-13 20:04:19 (Show Source): You can put this solution on YOUR website!do you want the solution for z or a ?
 Functions/356045: 10x+3y+2=9x+8 how do you write the equation in a function form? y=? i need help now this is my homework!please help!1 solutions Answer 254140 by edjones(7569)   on 2010-10-13 20:02:18 (Show Source): You can put this solution on YOUR website!10x+3y+2=9x+8 3y=-x+6 y=-x/3 + 2 . Ed
 Equations/355995: 8h+5>= -231 solutions Answer 254136 by edjones(7569)   on 2010-10-13 19:59:15 (Show Source): You can put this solution on YOUR website!8h+5>= -23 8h>=-28 2h>=-7 h>=-7/2 . Ed
 Functions/356003: 1/5(25-5y)=4x-9y+13 Rewrite the equation so that y is the function of x.1 solutions Answer 254135 by edjones(7569)   on 2010-10-13 19:53:26 (Show Source): You can put this solution on YOUR website!1/5(25-5y)=4x-9y+13 5-y=... -y=4x-9y+8 9y-y=4x+8 8y=... y = x/2 + 1 . Ed
 Polynomials-and-rational-expressions/356029: Find percent notation 11/16 1 solutions Answer 254131 by edjones(7569)   on 2010-10-13 19:43:21 (Show Source): You can put this solution on YOUR website!68.75%
 Probability-and-statistics/355590: A vacationer has brought along four novels and four nonfiction books. One day the person selects two at random to take to the beach. What is the probability that both are novels?1 solutions Answer 253938 by edjones(7569)   on 2010-10-13 01:19:55 (Show Source): You can put this solution on YOUR website!4/8 * 3/7 = 12/56 = 3/14 . Ed
 Probability-and-statistics/355591: A student studying for a vocabulary test knows the meanings of 14 words from a list of 20 words. If the test contains 10 words from the study list, what is the probability that at least 8 of the words on the test are words that the student knows? (Round your answer to three decimal places.) 1 solutions Answer 253937 by edjones(7569)   on 2010-10-13 01:13:50 (Show Source): You can put this solution on YOUR website!14/20=7/10=.7 Let x=.7 and y=.3 (x+y)^10 =x^10+10x^9y+45x^8y2 =.383 probability that at least 8 of the words on the test are words that the student knows. . Ed
 Average/355615: how do i solve -9.87x - 18.13x and how do i solve -56.08x + 26.68x1 solutions Answer 253936 by edjones(7569)   on 2010-10-13 00:59:04 (Show Source): You can put this solution on YOUR website!-9.87x-18.13x=-28x
 Proportions/355621: This is a word problem. I tried to use the formula for inverse variation, y=k/x but I am still not getting the correct answer and I think it is because I do not know how to plug the #s in correctly. Question: The length of time that a given # of bushels of corn will last when feeding cattle varies inversely with the # of animals. If x bushels will feed 25 cows for 10 days, how long will the feed last for 10 cows? I know the answer is 25 days, I just do not know how to get it. Thanks!1 solutions Answer 253934 by edjones(7569)   on 2010-10-13 00:55:34 (Show Source): You can put this solution on YOUR website!Thimk! 25*10=250 cow-days 250/10=25 days it will feed 10 cows. No fancy formulas required. . Ed
 Graphs/355614: Determine the equation of the line that passes through the points of intersection of the quadratic function f(x) = x^2 - 4 and G(x) = -3x^2 +2x +81 solutions Answer 253930 by edjones(7569)   on 2010-10-13 00:45:50 (Show Source): You can put this solution on YOUR website!We let the equations y coordinates be equal. x^2-4=-3x^2+2x+8 -4x^2+2x+12=0 x=-1.5, x=2 Quadratic formula. To find the y coordinate we can use either of the original equations. x^2-4 =(-1.5)^2-4 =2.25-4 =-1.75 . 2^2-4=0 . (-1.5, -1.75), (2, 0) the 2 points of intersection. . Ed .
 Percentage-and-ratio-word-problems/355611: what percentage of numbers between 100 and 999 inclusive have all the three digits same1 solutions Answer 253929 by edjones(7569)   on 2010-10-13 00:16:37 (Show Source): You can put this solution on YOUR website!9 numbers will have 3 digits the same. 999-100=899+1 (inclusive) 9/900=1/100=1% . Ed