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# Recent problems solved by 'rfer'

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 Linear-equations/227898: how do I solve for x please show the work. Example 4x + 0 = 21 solutions Answer 169289 by rfer(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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(12660)   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
 Graphs/227440: (-2, 2) and (4, 5) write the equation of the line in slope intersept form1 solutions Answer 169027 by rfer(12660)   on 2009-10-16 01:12:12 (Show Source): You can put this solution on YOUR website!y=mx+b y=1/2x+3
 percentage/227462: 42 is 25% less than what i need to know the equasion 1 solutions Answer 169026 by rfer(12660)   on 2009-10-16 01:06:43 (Show Source): You can put this solution on YOUR website!42/.75=56 42 is 75% of the total not 25% 25% is the difference between 42 and 56
 Travel_Word_Problems/227463: HOW MUCH TIME IS REQUIRED FOR A PLANE TO TRAVEL A DISTANCE OF 900 MILES AT AN AVERAGE SPEED OF 400 MILEs PER HOUR1 solutions Answer 169025 by rfer(12660)   on 2009-10-16 01:02:56 (Show Source): You can put this solution on YOUR website!900/400=2 hrs 15 min
 Surface-area/227473: The points (1,5), (4,5), and (1,0) represent three corners of a rectangle; find the coordinates of the fourth point.1 solutions Answer 169024 by rfer(12660)   on 2009-10-16 01:00:04 (Show Source): You can put this solution on YOUR website!(4,0)
 percentage/227474: eight is what percent of 40?1 solutions Answer 169023 by rfer(12660)   on 2009-10-16 00:57:57 (Show Source): You can put this solution on YOUR website!8/40=.2=20%
 Expressions-with-variables/227219: 3 TIMES THE SUM OF B AND 51 solutions Answer 168942 by rfer(12660)   on 2009-10-15 18:40:16 (Show Source): You can put this solution on YOUR website!3(B+5)
 Inequalities/227274: Jon has 1121 points in his math class. He must have 88% of the 1400 points possible by the end of the term to receive credit for the class. What is the minimum number of additional points he must earn by the end of the term to receive credit for the class. Answer must be used as an inequality.1 solutions Answer 168940 by rfer(12660)   on 2009-10-15 18:38:26 (Show Source): You can put this solution on YOUR website!1400*.88<1232