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# Recent problems solved by 'rfer'

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 Probability-and-statistics/228013: Find the sample space for an experiment in which two coins are tossed. My answer: {HH, HT, TH, TT} Can someone tell me if this is correct? thank you.1 solutions Answer 169370 by rfer(12727)   on 2009-10-17 21:21:55 (Show Source): You can put this solution on YOUR website!looks good Bob
 Probability-and-statistics/228014: Two coions are tossed. what is the probability that both land heads up. My answer is 1/4. Is that correct? thank you.1 solutions Answer 169369 by rfer(12727)   on 2009-10-17 21:20:42 (Show Source): You can put this solution on YOUR website!1/2*1/2=1/4
 Expressions-with-variables/228019: collect like terms: 1/2a + a + 5a and I need an explanation please.1 solutions Answer 169368 by rfer(12727)   on 2009-10-17 21:17:47 (Show Source): You can put this solution on YOUR website!6 1/2a
 expressions/227995: Simplify: x-{x-1-[x-2-(x-3-{x-4-[x-5-(x-6)]})]}1 solutions Answer 169363 by rfer(12727)   on 2009-10-17 20:00:18 (Show Source): You can put this solution on YOUR website!x-3
 Problems-with-consecutive-odd-even-integers/227828: Find two consecutive integers whose sum is 351 solutions Answer 169293 by rfer(12727)   on 2009-10-17 13:43:09 (Show Source): You can put this solution on YOUR website!x+x+1=35 2x=34 x=17 x+1=18
 Linear_Equations_And_Systems_Word_Problems/227844: One number exceeds another by ten and their sum is 34. Find the larger number.1 solutions Answer 169292 by rfer(12727)   on 2009-10-17 13:41:33 (Show Source): You can put this solution on YOUR website!x+x+10=34 2x=24 x=12 x+10=22
 Complex_Numbers/227897: HOW DO YOU SIMPLIFY (9-41)^2. I DONT UNDERSATAND THE PROCESS.1 solutions Answer 169290 by rfer(12727)   on 2009-10-17 13:38:08 (Show Source): You can put this solution on YOUR website!(9-41)^2 -32^2=1024
 Linear-equations/227898: how do I solve for x please show the work. Example 4x + 0 = 21 solutions Answer 169289 by rfer(12727)   on 2009-10-17 13:36:26 (Show Source): You can put this solution on YOUR website!4x+0=2 4x=2 x=2/4=1/2=.5
 Graphs/227862: to earn an A in a course, a student must get at least a 90 average on four tests and a final exam, with the final exam weighted twice that of any one test. If the four test scores are: 93, 69, 89, and 97, what is the lowest score the student can earn on the final exam and still get an A1 solutions Answer 169288 by rfer(12727)   on 2009-10-17 13:35:14 (Show Source): You can put this solution on YOUR website!(93+69+89+97+x)/5=90 (348+x)/5=90 348+x=90*5 348+x=450 x=102
 Numbers_Word_Problems/227854: The sum of 8 times a number and 5 is 37. Find the number.1 solutions Answer 169287 by rfer(12727)   on 2009-10-17 13:29:59 (Show Source): You can put this solution on YOUR website!8x+5=37 8x=32 x=4
 Money_Word_Problems/227859: if you deposit \$5,000 in an account paying 9% compounded daily, how much will you have in the account in 5 years? Compute the answer to the nearest cent.1 solutions Answer 169284 by rfer(12727)   on 2009-10-17 13:26:54 (Show Source): You can put this solution on YOUR website!A=P(1+.09/365)^1825 A=5000(1+.000246575)^1825 A=5000(1.568224214) A=\$7841.12
 Quadratic_Equations/227890: 38 subtracted from the product of 7 and a number is 11 1 solutions Answer 169283 by rfer(12727)   on 2009-10-17 13:21:06 (Show Source): You can put this solution on YOUR website!7x-38=11 7x=49 x=7
 Points-lines-and-rays/227896: Each side of a square is 2x-6 yards long . If the perimeter of the square is 72 yards what is the value of x ? 1 solutions Answer 169282 by rfer(12727)   on 2009-10-17 13:19:04 (Show Source): You can put this solution on YOUR website!4(2x-6)=72 8x-24=72 8x=96 x=24yds
 Unit_Conversion_Word_Problems/227871: mrs. cuylle's backyard is a rectangle 12m long by 10 m wide. for exercise mrs.cuylle walks around the outside of it. how far does he walk in 1 trip around?1 solutions Answer 169281 by rfer(12727)   on 2009-10-17 13:16:50 (Show Source): You can put this solution on YOUR website!44 m
 real-numbers/227884: (18)^56 * (18)^-14=1 solutions Answer 169278 by rfer(12727)   on 2009-10-17 13:11:22 (Show Source): You can put this solution on YOUR website!(18)^42=104976
 Linear-equations/227878: find the slope of the line containing the given points (9,1)and (10,-9)1 solutions Answer 169276 by rfer(12727)   on 2009-10-17 13:09:06 (Show Source): You can put this solution on YOUR website!slope=m=-10
 Money_Word_Problems/227785: If I borrow \$10,000 at the interest rate of 3.99% for 5 years compounded monthly How much will it cost in interest to pay the loan off in 5 years. P=r*t 10,000*3.99/12 I=0.3325/12 A=10,000(1+.00277)^60 1 solutions Answer 169234 by rfer(12727)   on 2009-10-17 01:28:32 (Show Source): You can put this solution on YOUR website!A=10000(1.003325)^60 A=10000*1.22) A=12203.88 12203.88-10000=\$2203.88
 Equations/227786: How would you perform the indicated operation and simplify? 6(3x+5y)1 solutions Answer 169233 by rfer(12727)   on 2009-10-17 01:22:10 (Show Source): You can put this solution on YOUR website!6(3x+5y) 18x+30y
 Linear-equations/227653: Tom buys \$20,000 worth of stock, and sells it eight months later for \$28,000. If he is required to pay 15% capital gains tax on his profits, how much tax will he pay? 1 solutions Answer 169232 by rfer(12727)   on 2009-10-17 00:52:31 (Show Source): You can put this solution on YOUR website!8000*.15=\$1200
 Equations/227781: How would I simplify this problem? 4{3[5(y-3)+9]+2(y+8)}1 solutions Answer 169231 by rfer(12727)   on 2009-10-17 00:46:34 (Show Source): You can put this solution on YOUR website!4(5(y-3)+9)+2(y+8)) 4(5y-15+9)+2y+16 20y-32+2y+16 22y-16
 Equations/227784: How do I collect the like terms? 18y+30a-9a+4y1 solutions Answer 169230 by rfer(12727)   on 2009-10-17 00:43:13 (Show Source): You can put this solution on YOUR website!18y+30a-9a+4y 22y+21a
 logarithm/227606: Which of the following will provide a better yield. (Interest rates are annual.) Plan A: \$40,000 invested for 3 years at 4.5% compounded quarterly Plan B: \$40,000 invested for 3 years at 4.4% compounded continuously 1 solutions Answer 169171 by rfer(12727)   on 2009-10-16 19:25:15 (Show Source): You can put this solution on YOUR website!A=P(1+r/n)^t*n A=40000(1+.045/4)^3*4 A=40000(1.01125)^12 A=40000(1.1436774) A=\$45,747.10 ----------------- A=P(e)^rt A=40000(2.7183)^.044*3 A=40000(2.7183)^.132 A=40000(1.1411) A=\$45,644.37
 Graphs/227619: what is the slope of (1.0,14400)(2.0,108000)1 solutions Answer 169165 by rfer(12727)   on 2009-10-16 19:09:18 (Show Source): You can put this solution on YOUR website!slope=93,600
 Travel_Word_Problems/227624: if two people start at the same location and walk in opposite directions. how long will it be before they are 30 miles away from each other.? if one walks 7 miles per hour and the other walks 4 miles per hour.1 solutions Answer 169164 by rfer(12727)   on 2009-10-16 19:05:50 (Show Source): You can put this solution on YOUR website!they are moving apart at 11 mph 30/11=2.73 hrs=2hrs 44 min
 Equations/227709: how to write an equation in slope intercept form that has a slope of 5 and a y intercept of -31 solutions Answer 169161 by rfer(12727)   on 2009-10-16 19:00:07 (Show Source): You can put this solution on YOUR website!y=mx+b m=slope b=y int y=5x-3
 Miscellaneous_Word_Problems/227661: A truck must cross a bridge that can support a maximum weight of 24,000 pounds. The weight of the empty truck is 1,500 pounds, and the driver weighs 190 pounds. What is the weight of a load that the truck can carry?1 solutions Answer 169160 by rfer(12727)   on 2009-10-16 18:58:55 (Show Source): You can put this solution on YOUR website!24000-1690=22,310 lbs
 Angles/227668: If angle 1 is 25.728 deg and angle 3 is 49.489 deg. what is angle 2 which is half way between the two? 1 solutions Answer 169159 by rfer(12727)   on 2009-10-16 18:56:55 (Show Source): You can put this solution on YOUR website!37.6085 degrees subtract the two angles divide that by 2 add that to the smaller angle or subtract it from the larger angle
 Average/227701: solid gift wrap \$4 each. printed gift wrap \$6 each. the total number of gift wrap sold is 480. the total amount of money collected is \$2340. how much gift wrap was sold for each kind? 1 solutions Answer 169157 by rfer(12727)   on 2009-10-16 18:51:33 (Show Source): You can put this solution on YOUR website!x+y=480, y=480-x 4x+6y=2340 4x+6(480-x)=2340 4x+2880-6x=2340 -2x=-540 x=270 \$4 y=210 \$6 270*4=1080 210*6=1260
 Linear-equations/227706: The sum of two consecutive integers is 37. Find the number.1 solutions Answer 169154 by rfer(12727)   on 2009-10-16 18:45:58 (Show Source): You can put this solution on YOUR website!x+x+1=37 2x=36 x=18 x+1=19
 Percentage-and-ratio-word-problems/227451: The largest and smallest creature on record measured about 1 1/4 feet and 1/50 foot long, respectively. How many times larger is the largest creature?1 solutions Answer 169030 by rfer(12727)   on 2009-10-16 01:17:43 (Show Source): You can put this solution on YOUR website!62.5 times larger
 Percentage-and-ratio-word-problems/227496: You get 7 out of 11 answers correct on a quiz. About how many correct answers could you expect on a quiz that has 8 questions?1 solutions Answer 169028 by rfer(12727)   on 2009-10-16 01:14:16 (Show Source): You can put this solution on YOUR website!7 out of 11=64% 64% of 8=5