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# Recent problems solved by 'JBarnum'

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 percentage/317270: Change these percents to fraction form.7.23%1 solutions Answer 227136 by JBarnum(2044)   on 2010-06-24 16:27:23 (Show Source): You can put this solution on YOUR website!7.23%=.0723 .0723=
 Linear-systems/317273: Solve the following system of equations. 3x+5y=-11 x-2y=11 (x,y)=?1 solutions Answer 227134 by JBarnum(2044)   on 2010-06-24 16:24:02 (Show Source): You can put this solution on YOUR website! multiply this line by 3 subtract this from first line (x,y)=(3,-4)
 Age_Word_Problems/317263: ann is 7/10 of bob's age. in 4 years and will be 8/11 of bob's age. How old is Bob now?1 solutions Answer 227130 by JBarnum(2044)   on 2010-06-24 16:06:27 (Show Source): You can put this solution on YOUR website! LCD 10*11=110 multiply by 110 divide by 3 bob is 60 years old ann is 42 years old
 Radicals/317240: Subtract. The 3 is the index 3√54x - 3√2x^41 solutions Answer 227128 by JBarnum(2044)   on 2010-06-24 15:51:47 (Show Source): You can put this solution on YOUR website! im using the same 3 as index factor out the third powers factor out the
 Equations/317245: Solve. Selma is flying a kite. She lets out 80 feet of string. Her brother moves to a point where he is standing directly under the kite. He measures this distance to be 30 feet. How high is the kite?1 solutions Answer 227127 by JBarnum(2044)   on 2010-06-24 15:42:22 (Show Source): You can put this solution on YOUR website!triangle question 80=c 30=a find b 74.162 feet high
 Trigonometry-basics/317237: 2/x+1=1/x-21 solutions Answer 227125 by JBarnum(2044)   on 2010-06-24 15:34:44 (Show Source): You can put this solution on YOUR website!this isnt trig.... simple proportions cross multiply
 Equations/317247: Solve. A pool table is 95 inches long and 51 inches wide. What is the length of the diagonal of the pool table?1 solutions Answer 227122 by JBarnum(2044)   on 2010-06-24 15:31:00 (Show Source): You can put this solution on YOUR website!this is a triangle problem 107.8239 inches
 Miscellaneous_Word_Problems/317257: As a restaurant owner there are many decisions that you need to make on a daily basis, such as where to keep inventory levels. You wish to replenish your stock of dishes by purchasing 250 sets for your restaurant. You have two dish design from which to choose. One design costs \$20 per set and the other \$45 per set. If you only have \$6,800 to spend, how many of each design should you order? Hint: Let x = the number of sets of \$20 dishes and y = the number of sets of \$45 dishes. •Solve the equations for the different dish designs to be ordered with the desired technique: graphing, substitution, elimination, matrix. •Explain how to check your solution for both equations. PLEASE HELP.... I NEED TO ANASWER THIS TODAY AND IAM STUCK AND SWAMPED WITH OTHER WORK>>> THANK YOU!!!1 solutions Answer 227110 by JBarnum(2044)   on 2010-06-24 15:16:34 (Show Source): You can put this solution on YOUR website!x+y=250 20x+45y=6800 checking correct Checking correct
 Equations/317249: Solve. Dana drove her car from her house to her school. She went 7 miles due west and 3 miles due south. How far is Dana's house from the school?1 solutions Answer 227102 by JBarnum(2044)   on 2010-06-24 14:50:53 (Show Source): You can put this solution on YOUR website!this is a triangle problem 7.61 miles
 Triangles/317253: An angle exceeds 4 times it’s supplement. Find the new angle formed if supplement is 30 degree.1 solutions Answer 227100 by JBarnum(2044)   on 2010-06-24 14:45:09 (Show Source): You can put this solution on YOUR website!supplement has 2 angles that add up to 180 4*30=120 the angle exceeds 120 180-30=150 150 has to be the angle if its supplement is 30
 Equations/317227: John bought a .60 donut and .35 cup of coffee. How much did John leave for a tip and taxes if he spent 1.25? Assign a variable and write an equation for the situation then solve.1 solutions Answer 227099 by JBarnum(2044)   on 2010-06-24 14:40:50 (Show Source): You can put this solution on YOUR website!.60+.35=.95 theres a 7% tax here in florida, unless u specify differently im using floridas tax. with rounding up theres 7 cents tax .95+.07=1.02 1.25-1.02=.23 tip .23/1.02=22.5% tip
 Inequalities/317231: 5 + (-8)>4 (-2) + 11 solutions Answer 227086 by JBarnum(2044)   on 2010-06-24 13:34:42 (Show Source): You can put this solution on YOUR website!just calculate it -3>-7
 Angles/317229: Find the measure of the complement of an angle that measures 64°. 1 solutions Answer 227085 by JBarnum(2044)   on 2010-06-24 13:33:16 (Show Source): You can put this solution on YOUR website!complement is for 2 angles that add to 90 so 90-64=26 26 degrees
 real-numbers/317036: how do you prove that 0.37 is a rational number? 1 solutions Answer 226971 by JBarnum(2044)   on 2010-06-23 20:44:03 (Show Source): You can put this solution on YOUR website!define it and show that irrational numbers dont stop example =3.1415926535.....
 Inequalities/317032: Add and simplify if possible. 6x / x^2 - 4 + x / x - 21 solutions Answer 226970 by JBarnum(2044)   on 2010-06-23 20:41:44 (Show Source): You can put this solution on YOUR website!well acording to above doing order of opperations
 Linear_Equations_And_Systems_Word_Problems/317016: A man divided \$9,000 among his wife, son, and daughter. The wife received twice as much as the daughter, and the son received \$1,000 more than the daughter. How much did each receive? If x is the amount the wife received, then which of the following expressions represents the amount received by the son? 1 solutions Answer 226967 by JBarnum(2044)   on 2010-06-23 20:27:05 (Show Source): You can put this solution on YOUR website!i like using the first letter of the names as my variables w=wife s=son d=daughter w+s+d=9000 w=2d s=1000+d solve for d as far as the second part i cant see the selection of equations that u can
 Linear_Equations_And_Systems_Word_Problems/317015: Solve this problem on paper using all four steps. A girl scout troop sold cookies. If the girls sold 5 more boxes the second week than they did the first, and if they doubled the sales of the second week for the third week to sell a total of 431 boxes of cookies, how many did they sell each week? 1 solutions Answer 226966 by JBarnum(2044)   on 2010-06-23 20:19:53 (Show Source): You can put this solution on YOUR website!x=week 1 amount y=week 2 amount z=week 3 amount y=5+x 2y=z x+y+z=431 solve for x
 Proportions/317013: The school cafeteria has found that they go through 9 sandwiches for every 7 tickets they sell to the students. Today they have 546 tickets for sale. How many sandwiches do they need to make? 1 solutions Answer 226964 by JBarnum(2044)   on 2010-06-23 20:12:08 (Show Source): You can put this solution on YOUR website!proportions cross multiply multiply divide by 7 702 sandwiches
 decimal-numbers/317025: what is the fraction form of 1.38?1 solutions Answer 226962 by JBarnum(2044)   on 2010-06-23 20:08:50 (Show Source): You can put this solution on YOUR website! ______ 1.38*100=138 ______ 138/100=1.38 this is its reduced form
 Linear_Equations_And_Systems_Word_Problems/317017: Solve this problem on paper using all four steps. Ted weighs twice as much as Julie. Mike weighs three times as much as Julie. Together, Ted, Mike, and Julie weigh 210 lbs. What is the weight of each person? Julie weighs pounds, Ted weighs pounds, and Mike weighs pounds. 1 solutions Answer 226961 by JBarnum(2044)   on 2010-06-23 20:06:01 (Show Source): You can put this solution on YOUR website! "Ted weighs twice as much as Julie" "Mike weighs three times as much as Julie" "Together, Ted, Mike, and Julie weigh 210 lbs" add like terms divide by 6 Checking
 Polynomials-and-rational-expressions/316975: Factor: 25v^2-w^21 solutions Answer 226905 by JBarnum(2044)   on 2010-06-23 16:53:23 (Show Source): You can put this solution on YOUR website!its a perfect square
 Linear-equations/316946: What are the x and y intercepts and how do you find them? What are the x and y intercepts for the linear equation 2x + 3y = 15?1 solutions Answer 226903 by JBarnum(2044)   on 2010-06-23 16:52:15 (Show Source): You can put this solution on YOUR website!put line in slope intercept form y=mx+b b=y-intercept set y=0 to find x-intercept 3y=-2x+15 y=(-2/3)x+5 5=y-intercept 0=(-2/3)x+5 -5=(-2/3)x -15=-2x 15/2=x-intercept
 Polynomials-and-rational-expressions/316972: solving polynomial equations by factoring 5r^3 +15r^2-20r the solutions is ________________1 solutions Answer 226901 by JBarnum(2044)   on 2010-06-23 16:39:46 (Show Source): You can put this solution on YOUR website! factor out 5r two numbers that multiply to get -4 and add to get +3 are -1&4 completely factored
 Radicals/316971: simplify: sqrt (121/9) a) sqrt (11) / sqrt (3) b) 3 sqrt (11) c) 11/3 d) sqrt (11) / (3)1 solutions Answer 226900 by JBarnum(2044)   on 2010-06-23 16:36:28 (Show Source):
 Evaluation_Word_Problems/316970: a certain type of gutter comes in 6 foot and 10 foot sections. How many different lengths can be formed usin g3 sections of gutter? 1 solutions Answer 226899 by JBarnum(2044)   on 2010-06-23 16:34:47 (Show Source): You can put this solution on YOUR website!well if u write out the 4 possibilities 6+6+6=18 6+6+10=22 6+10+10=26 10+10+10=30 so there are only 4 different lengths
 Rectangles/316950: The perimeter of a rectangle is 140m. The length is 1m more than twice the width. Find the dimensions.1 solutions Answer 226897 by JBarnum(2044)   on 2010-06-23 16:30:09 (Show Source): You can put this solution on YOUR website!p=2l+2w p=140 l=1+2w 140=2(1+2w)+2w 140=2+4w+2w 140=2+6w 138=6w l=1+2(23) l=1+46
 Radicals/316968: simplify the following radical expression: sqrt (3) * sqrt (3) a) none or 0 b) sqrt (3) c) 3 d) 1 1 solutions Answer 226895 by JBarnum(2044)   on 2010-06-23 16:25:06 (Show Source):
 Inequalities/316954: Solve the inequality for y. 16 less than or equal to y + 51 solutions Answer 226893 by JBarnum(2044)   on 2010-06-23 16:23:18 (Show Source): You can put this solution on YOUR website! subtract 5
 Linear-systems/316964: A 96 inch board is cut into two pieces, one piece is 8 inches longer than the other. how long should each piece be?1 solutions Answer 226892 by JBarnum(2044)   on 2010-06-23 16:21:30 (Show Source):
 Numbers_Word_Problems/316965: If twice a number is added to 3 and is divided by the muber plus 1 the result is three halve. What is the number?1 solutions Answer 226891 by JBarnum(2044)   on 2010-06-23 16:17:31 (Show Source): You can put this solution on YOUR website!personally i think thats a poorly written word problem if in book or by a teacher...Id simply state: "If twice a number added to 3 and divided by the number plus 1 is three halves, what is the number?" id treat this the same way one would solve a proportion, that being cross multiplying distribute subtract 3n subtract 6 Check Correct
 Average/316966: the average mark of 4 tests is 72 if the numbers are 60 and 80 find the third number1 solutions Answer 226890 by JBarnum(2044)   on 2010-06-23 16:07:58 (Show Source): You can put this solution on YOUR website!dont u mean 3 tests since theres clearly no indication to find the 4th one and with a 2nd variable it would make for an incredible guess and check question with lots of possibilities. so im going to assume u meant 3 tests just to show u what the problem would be with 2 unknowns: as u can se there are many possibilities for what x or y could be, which would make a question like this unanswerable. good luck