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# Recent problems solved by 'rfer'

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 Miscellaneous_Word_Problems/374771: At 6h00 a clock strikes the bell 6 times. The time between first and last strike is 30 seconds. How long does it take to strike the bell at 12h00 ? 1 solutions Answer 266526 by rfer(12644)   on 2010-11-22 00:34:39 (Show Source): You can put this solution on YOUR website!60 sec
 Numeric_Fractions/374766: simplify each expression 3/4 divided by 6/5+8/12 times 6/9 -5/121 solutions Answer 266525 by rfer(12644)   on 2010-11-22 00:33:02 (Show Source): You can put this solution on YOUR website!3/4*5/6+8/12*6/9-5/12 15/24+48/108-5/12 5/8+4/9-5/12 45/72+32/72-30/72=47/72
 Numeric_Fractions/374777: reduce to the lowest term.. (-6/7)divided by (5/7)(-5/6)1 solutions Answer 266523 by rfer(12644)   on 2010-11-22 00:27:07 (Show Source): You can put this solution on YOUR website!-6/7*7/5*-5/6=210/210=1
 Average/374696: What is the slope of the line described by -6x = -2y + 5?1 solutions Answer 266482 by rfer(12644)   on 2010-11-21 21:08:31 (Show Source): You can put this solution on YOUR website!2y=6x+5 y=3x+2.5 slope m=3
 Percentage-and-ratio-word-problems/374681: how do you solve this? --> a jacket costs \$120 which includes a 5% sales tax. what was the cost of the jacket without the tax?1 solutions Answer 266481 by rfer(12644)   on 2010-11-21 21:07:00 (Show Source): You can put this solution on YOUR website!120/1.05=114.29
 percentage/374624: The population of a city is 350,600. If 0.1% of the population earns more than \$200,000, about how many people are in this category? 1 solutions Answer 266473 by rfer(12644)   on 2010-11-21 20:06:28 (Show Source): You can put this solution on YOUR website!350000*0.001=350
 expressions/374646: Evaluate -6 + x ÷ 4(8 – x^2) for x = -4. Please show all of your work1 solutions Answer 266472 by rfer(12644)   on 2010-11-21 20:03:41 (Show Source): You can put this solution on YOUR website!-6+-4/4(8--4^2) -6+-4/-8 -6+.5 -5.5
 Divisibility_and_Prime_Numbers/374642: A CD player is on sale for \$270. What was the original price of the CD player if the discount was 2/5 of the original price?1 solutions Answer 266469 by rfer(12644)   on 2010-11-21 20:00:15 (Show Source): You can put this solution on YOUR website!270/.060=\$450
 Expressions-with-variables/374508: 4.2z=-4(0.6z-1.2)1 solutions Answer 266427 by rfer(12644)   on 2010-11-21 18:09:34 (Show Source): You can put this solution on YOUR website!4.2z=-2.4z+4.8 add 2.4z to both sides 6.6z=4.8 divide by 6.6 z=(4.8)/(6.6) z=0.073
 Linear-equations/374544: Write the standard form of the equation of each line given the slope and y-intercept: Slope=9, y intercept=4 The answer is 9x-y=-4 but how?1 solutions Answer 266426 by rfer(12644)   on 2010-11-21 18:05:48 (Show Source): You can put this solution on YOUR website!slope intcept form y=mx+b y=9x+4 change to standard form -9x+y=4 multiply through by -1 9x-y=-4
 Matrices-and-determiminant/374563: what is the determinante 2x+3y=4 x-2y=91 solutions Answer 266425 by rfer(12644)   on 2010-11-21 18:01:58 (Show Source): You can put this solution on YOUR website!a=2 b=3 c-4 a=1 b=2 c=9
 Linear-equations/374556: Write the standard form of the equation of each line: y=-7/5x+1 answer is 7x+5y=5 but how? y+4=-7(x-1) answer is 7x+y=3 how? -10x-y=-5 answer is 10x+y=5 how? y=3/2x+5 answer is 3x-2y=10 how? 1 solutions Answer 266424 by rfer(12644)   on 2010-11-21 17:59:48 (Show Source): You can put this solution on YOUR website!y=-7/5x+1 multiply both sides by 5 5y=-7x+5 add 7x to both sides 7x+5y=5 -------------------- y+4=-7(x-1) multiply y+4=-7x+7 add 7x to both sides 7x+y+4=7 subtract 4 from both sides 7x+y=3 --------------------- -10x-y=-5 multiply through by -1 10x+y=5 --------------------------- You try the last one. Bob
 Trigonometry-basics/374557: Please help me solve this question sin degree 32?1 solutions Answer 266423 by rfer(12644)   on 2010-11-21 17:51:37 (Show Source): You can put this solution on YOUR website!0.52992
 Linear-systems/374204: Solve the following equation for y 8/y+2=-31 solutions Answer 266308 by rfer(12644)   on 2010-11-20 22:20:51 (Show Source): You can put this solution on YOUR website!8/y=-5 8=-5y y=-1.6
 Inverses/374163: Perform the indicated operation and, if possible, simplify. Please show all of your work (-5/7-2/5)1 solutions Answer 266306 by rfer(12644)   on 2010-11-20 22:18:39 (Show Source): You can put this solution on YOUR website!-25/35-14/35=-39/35=-1 4/35
 Geometry_proofs/374148: What is the point of geometry proofs?1 solutions Answer 266271 by rfer(12644)   on 2010-11-20 20:31:55 (Show Source): You can put this solution on YOUR website!To learn an orderly method of understanding what is taking place.
 Radicals/374153: how do I begain to find the distance between each pair of points. (-5,-2) and (-7,-1) 1 solutions Answer 266270 by rfer(12644)   on 2010-11-20 20:30:10 (Show Source): You can put this solution on YOUR website!you use a form of the Pythagorem therom d=sqrt((-7--5)^2+(-1--2)^2) d=sqrt((-2)^2+(1)^2) d=sqrt(4+1) d=2.236
 test/374137: If you know the mean is 6 and the sum of the scores is 48. What is n? 1 solutions Answer 266239 by rfer(12644)   on 2010-11-20 18:53:39 (Show Source): You can put this solution on YOUR website!n=8
 Proportions/374095: Maria earns \$603.75 for 35 hours of work. What is her rate of pay per hour.1 solutions Answer 266231 by rfer(12644)   on 2010-11-20 17:47:38 (Show Source): You can put this solution on YOUR website!603.75/35=17.25 per hr
 Finance/374017: Larry has \$2600 to invest and needs \$3100 in 13 years. What annual rate of return will he need to get in order to accomplish his goal, if interest is compounded continuously? (Round your answer to two decimals.) a.1.35% b.3.44% c.1.44% d.2.44%''. 1 solutions Answer 266186 by rfer(12644)   on 2010-11-20 13:17:06 (Show Source): You can put this solution on YOUR website!A) 1.35% A=P(e)^rt A=2600(2.7183)^r(13)
 Rational-functions/373994: 100 invested at 7% compounded quartely after a period of 2 years?1 solutions Answer 266184 by rfer(12644)   on 2010-11-20 13:04:04 (Show Source): You can put this solution on YOUR website!A=100(1+0.07/4)^4*2 A=100(1.0175)^8 A=100*1.14888 A=114.89
 Complex_Numbers/374008: I know the answer is 25, but im unsure if it's negative or positive. (-5i)^2 the i is the imaginary number, not a variable.1 solutions Answer 266183 by rfer(12644)   on 2010-11-20 13:00:25 (Show Source): You can put this solution on YOUR website!It has been awhile but I think i =-1 so -5*-1=+5^2=+25
 real-numbers/373771: how do i multiply more than two real numbers? For example -12(-3)(-7)(-5/21) = 1 solutions Answer 265987 by rfer(12644)   on 2010-11-19 16:23:21 (Show Source): You can put this solution on YOUR website!1260/5=252 even number of minus signs = a plus answer
 Polynomials-and-rational-expressions/373772: Describe the steps involved, in detail, in finding the product of x+2 and x-2?1 solutions Answer 265985 by rfer(12644)   on 2010-11-19 16:20:42 (Show Source): You can put this solution on YOUR website!(x+2)(x-2) x^2-2x+2x-4 combine x^2-4
 percentage/373768: How do you turn a number or fraction into a percentage? 1 solutions Answer 265984 by rfer(12644)   on 2010-11-19 16:19:22 (Show Source): You can put this solution on YOUR website!whole number 2 move decimal two places right 200% fraction 1/4= 0.25= 25% decimail 0.75=75%
 Linear-equations/373540: how dou you solve the linear system by graphing? y=-x+3 y=x+11 solutions Answer 265852 by rfer(12644)   on 2010-11-19 01:15:38 (Show Source): You can put this solution on YOUR website!y=-x+3 y=x+1 ---------- -x+3=x+1 -2x=-2 x=1 -------------- y=-1+3 y=2 ---------------- 2=1+1
 Linear_Algebra/373535: Hello, I need help solving this problem, thanks in advance. f(x) = \$35.99 * 7 days 1 solutions Answer 265851 by rfer(12644)   on 2010-11-19 01:12:24 (Show Source): You can put this solution on YOUR website!f(7)=35.99*7 f(7)=251.93
 percentage/373544: steps on how to find the final price of each item when you have this problem dress:\$70.00 Discount:30% tax:7%1 solutions Answer 265850 by rfer(12644)   on 2010-11-19 01:10:19 (Show Source): You can put this solution on YOUR website!70*.70=49 49*1.07=52.43
 Miscellaneous_Word_Problems/373557: Charlie drove 250 miles using 9 gallons of gas. At this rate, how many gallons of gas would he need to drive 350 miles?1 solutions Answer 265849 by rfer(12644)   on 2010-11-19 01:07:37 (Show Source): You can put this solution on YOUR website!9/250=x/350 250x=3150 x=12.6 gal
 Number-Line/373450: 1. For homework we had to make number lines out of the problems. i Know how to do this type of problem: x+3>9 the answer is: x>6 what i dont get is this type of problem: 2x+6<141 solutions Answer 265798 by rfer(12644)   on 2010-11-18 21:01:23 (Show Source): You can put this solution on YOUR website!2x+6 < 14 2x < 8 now divide both sides by 2 x < 4 Just one additional step.
 test/373449: Roberto built a model racecar that is 3 inches long and has a scale of 0.5inches = 2 feet. he determined that the real car must be 3•2 or 6 feet long. is this correct? explain 1 solutions Answer 265797 by rfer(12644)   on 2010-11-18 20:58:16 (Show Source): You can put this solution on YOUR website!3/.5=6 6*2=12 ft 6 half inch pieces in 3 inches