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# Recent problems solved by 'sofiyac'

Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719, >>Next

 Linear_Algebra/402149: how to solve word problems that includes time and distance1 solutions Answer 284526 by sofiyac(695)   on 2011-01-31 10:34:04 (Show Source): You can put this solution on YOUR website!Use the formula distance=speed*time d=rt
 Geometry_Word_Problems/402150: can you solve this equation 3x = 2x + 61 solutions Answer 284525 by sofiyac(695)   on 2011-01-31 10:33:08 (Show Source): You can put this solution on YOUR website!subtract 2x from each side and you get 3x-2x=2x-2x+6 x=6
 Numeric_Fractions/402164: three of the given calculator answer below or incorrect. find them 229+443+606 1273 HOW WOULD I ANWER THAT1 solutions Answer 284524 by sofiyac(695)   on 2011-01-31 10:32:01 (Show Source): You can put this solution on YOUR website!when you add 229, 443 and 606 you get 1278, NOT 1273.
 test/402184: Qs=-2+p Qs=8-p1 solutions Answer 284523 by sofiyac(695)   on 2011-01-31 10:30:21 (Show Source): You can put this solution on YOUR website!Add them together and you get 2Qs=6 divide each side by 2 and you get Qs=3 Then plug that into either of the equations and you get 3=-2+p add 2 to each side and you get 5=p
 Polynomials-and-rational-expressions/402188: I need help w/ this one...please use rational exponents to simplify 5sqrt x^151 solutions Answer 284521 by sofiyac(695)   on 2011-01-31 10:28:45 (Show Source): You can put this solution on YOUR website! When you take square root of x^14 you divide the power by two, so when you take out from radical sign you get x^7.
 Polynomials-and-rational-expressions/402198: Factor completely: 20z^+100ag+125g^ please assist....algebra is so confusing..was when I was in high school..now am in college at age 44 and am lost!! Thanks in advance, Kathy1 solutions Answer 284520 by sofiyac(695)   on 2011-01-31 10:25:57 (Show Source): You can put this solution on YOUR website!I hope i copied your problem correctly, if not email me sofiyacherni@hotmail.com. You have the power signs but no powers, so i'm confused. Use the curly brackets found next to letter P on the keyboard. Three brackets on each side would let you write problems properly, ie
 Equations/402201: Problem: 9q + 6p - 7p + q Book answer: -p + 10q My answer: 10q + -p Not going to school, so I don't know if my answer is correct or not. How would you grade it.1 solutions Answer 284519 by sofiyac(695)   on 2011-01-31 10:21:35 (Show Source): You can put this solution on YOUR website!Your answer is correct technically BUT 1. It's not correct to write two symbols together like + -. It would simplify to just -. 2. Normally the answer is written with letters in alphabetical order. So p comes BEFORE q, that's why the answer should be -p+10q. :)
 Polynomials-and-rational-expressions/402166: Simplify: 2^n+1 (x+3)^n --------------------- 2^n (x+3)^n-1 1 solutions Answer 284509 by sofiyac(695)   on 2011-01-31 08:40:27 (Show Source):
 Numbers_Word_Problems/401202: The price of a car is increased by 25%. The new price, after the increase is 250000. Find the following using an equation: 1)The original Price 2)The amount of the increase1 solutions Answer 283898 by sofiyac(695)   on 2011-01-28 15:47:20 (Show Source): You can put this solution on YOUR website!percent******number 100***********x 125**********250000 multiply across, they are ratios. so this is the original value Thus the amound of the increase is increase=250000-200000=50000
 Evaluation_Word_Problems/401204: We have 10 people in our group and we would like to set up a system where everyone can talk to everyone else individually for 10 minutes, how can we do this and how long would it take? 1 solutions Answer 283896 by sofiyac(695)   on 2011-01-28 15:44:27 (Show Source): You can put this solution on YOUR website!you can set up a conference call, everyone talks for 10 minutes each 10*10=100 minutes or 1 hour and 40 minutes. You didn't specify if i talked to you and you talked to me, if that counts as once, i assume so?
 Probability-and-statistics/401167: a deck of a cards is number 1 to 32, if you draw one card at random, what is the probability that the card you draw will have 5 as a factor 1 solutions Answer 283894 by sofiyac(695)   on 2011-01-28 15:42:09 (Show Source): You can put this solution on YOUR website!So the only cards divisible by 5 are 4 5's and 4 10's, which makes a total of 8 cards. So your probability is 8 out of 32, so 8/32=1/4. :)
 Linear-equations/401200: Please teach me step by step how to solve the following equation and similar equations: (3x^2+3/4x-1)-(x^2-1/4x) Thank you very much!1 solutions Answer 283893 by sofiyac(695)   on 2011-01-28 15:40:31 (Show Source):
 Distributive-associative-commutative-properties/401130: 7/3(12/7x) These are fractions. Use the commutative and associative properties as needed to simplify this expression.1 solutions Answer 283892 by sofiyac(695)   on 2011-01-28 15:38:56 (Show Source): You can put this solution on YOUR website!Your problem is not copied properly, do you mean to say ??? because that's how you wrote it. I'm assuming you mean The x on top or middle is the same thing, but it's not equivalent to the x being on the bottom. Use proper brackets so that we could see the correct problem.
 Points-lines-and-rays/401178: m=-1 and b=-41 solutions Answer 283890 by sofiyac(695)   on 2011-01-28 15:34:11 (Show Source): You can put this solution on YOUR website!You didn't post the question. We're not mind readers. I'm thinking you need to come up with an equation in slope intercept form for a line that has a slope m=-1 and a y intercept of b=-4 (that's my best guess on what you need?????) y=mx+b plug in your values y=-1x-4 y=-x-4 this is would be the equation
 Problems-with-consecutive-odd-even-integers/401199: The sum of three integers is 52. The second integer is 3 more than the first. The third integer is 1 more than twice the first. What are the integers?1 solutions Answer 283888 by sofiyac(695)   on 2011-01-28 15:32:10 (Show Source): You can put this solution on YOUR website!let the first integer be x then the second will be x+3 then the third one will be 2x+1 Now you can add them up and make sum equal to 52 x+x+3+2x+1=52 4x+4=52 4x=48 x=12 so since we named the first one x, then the first one is 12 then the second one is 12+3=15 then the third one is 2*12+1=25 :0)
 Graphs/401201: x=2y-12 what is the solution 4x-4y=-161 solutions Answer 283886 by sofiyac(695)   on 2011-01-28 15:27:55 (Show Source): You can put this solution on YOUR website!x=2y-12 4x-4y=-16 First one is already solved for x, so where you see x in second equation plug in 2y-12 instead. 4(2y-12)-4y=-16 8y-48-4y=-16 4y-48=-16 4y=32 y=8 now go back up to first equation and wherever you see y plug in 8 instead. x=2*8-12 x=16-12 x=4 So the solution is (4,8) :)
 Travel_Word_Problems/401191: If you drive 20 miles and it takes you 30 minutes, your average speed is _______.1 solutions Answer 283867 by sofiyac(695)   on 2011-01-28 13:57:14 (Show Source): You can put this solution on YOUR website!speed is distance/time and is usually given in miles per hour, so first we convert 30 minutes to hours, 30 minutes is half of an hour, so 0.5 hours. so speed=20/.5=40 miles per hour :)
 Graphs/400431: Find the x-intercepts. What aré the solutions of the equation? Y= x^2+8x+16 can you please help me with this math problem1 solutions Answer 283865 by sofiyac(695)   on 2011-01-28 13:55:09 (Show Source): You can put this solution on YOUR website!for x intercepts plug in y=0 and solve for x x+4=0 x=-4 so you have 2 roots but they are the same so the intercept is at x=-4
 Unit_Conversion_Word_Problems/401103: Hai sir, please help me on this problem, thank you Steve buys 20 bottles of Fizzypop. Each bottle contains 250ml. How many litres does he buy?1 solutions Answer 283864 by sofiyac(695)   on 2011-01-28 13:44:50 (Show Source): You can put this solution on YOUR website!20*250=5000ml now you need to convert it to liters, there are 1000 ml in 1 liter, you are going from smaller unit to bigger unit which means you divide. 5000/1000=5 liters
 Exponential-and-logarithmic-functions/401119: At a wholesale food distribution center, the price of sugar has increased 6.3% annually since 1980. Suppose sugar cost \$0.43 per pound in 1980 and this growth continues. What will a pound of sugar cost in 2017? Use y = a(1 + r)^t and round to the nearest cent.1 solutions Answer 283863 by sofiyac(695)   on 2011-01-28 13:42:34 (Show Source): You can put this solution on YOUR website! First you need to convert your percent from a percent to a number so you divide it by 100 and get 0.063. Then you just plug in the numbers into the formula and evaluate.
 Square-cubic-other-roots/401107: what is a quadratic equation for x= -4 abd x= 71 solutions Answer 283862 by sofiyac(695)   on 2011-01-28 13:38:47 (Show Source): You can put this solution on YOUR website!So you kind of go backwards here. You move solutions to the other side of the equal sign because x=-4 means that x+4=0 same thing for the other one. Then you just multiply them out.
 Proportions/401133: Y=mx+b1 solutions Answer 283860 by sofiyac(695)   on 2011-01-28 13:35:56 (Show Source): You can put this solution on YOUR website!What is your question?
 Polynomials-and-rational-expressions/401162: Can someone please help? Combine like terms. Write all answers in descending order. 12t^6-t^3+8t^6+4t^3-t^7-3t^31 solutions Answer 283859 by sofiyac(695)   on 2011-01-28 13:34:35 (Show Source): You can put this solution on YOUR website! The cubed terms cancel out, so that's why you don't have any
 Linear-equations/401173: Graph the equation x=Absolute valuey+3absolutevalue + 4 by plotting points. 1 solutions Answer 283858 by sofiyac(695)   on 2011-01-28 13:32:34 (Show Source): You can put this solution on YOUR website! Plug in any points for x and evaluate y, or the other way around, be sure to use positive and negative values.
 Linear-equations/401174: Graph the equation y=0.75Absolute value x-1 absolute value1 solutions Answer 283857 by sofiyac(695)   on 2011-01-28 13:30:21 (Show Source):
 Numbers_Word_Problems/401175: Hai sir, pls help me on this, i got stuck on this Find a number which is greater than one-fifth of itself by 121 solutions Answer 283856 by sofiyac(695)   on 2011-01-28 13:27:51 (Show Source): You can put this solution on YOUR website!let that number be x, then in order to make an equality you would say mulitply every term by 5 in order to get rid of the fraction 60=4x 15=x To check your answer: x is 15, and when you times it by 1/5 you get 3, so 15 is greater than 3 by 12 :)
 Polynomials-and-rational-expressions/401177: I am having trouble here... Could someone help me? Please? Combine like terms. Write all answers in decending order. 12t^6-t^3+8t^6+4t^3-t^7-3t^3 1 solutions Answer 283855 by sofiyac(695)   on 2011-01-28 13:23:39 (Show Source): You can put this solution on YOUR website! the cubed terms cancel out (add to zero)
 Travel_Word_Problems/400024: A jar of nickels and dimes contains \$5.45. there are 8 more dimes than nickels. how many of each are there? 1 solutions Answer 283655 by sofiyac(695)   on 2011-01-27 16:10:52 (Show Source): You can put this solution on YOUR website!nickels x dimes x+8 so value of nickels would be 0.05x and value of dimes would be 0.10(x+8) then it is true that 0.05x+0.10(x+8)=5.45 0.05x+0.10x+0.80=5.45 0.15x+0.80=5.45 0.15x=4.65 x=31 so there are 31 nickels and 31+8=39 dimes
 Square-cubic-other-roots/400722: Can someone help me pleas? Rationalize the denominator 10√3/3√21 solutions Answer 283652 by sofiyac(695)   on 2011-01-27 16:02:42 (Show Source): You can put this solution on YOUR website!multiply top and bottom by 3sqrt(2) and you get reduce by 6
 Equations/400725: TRANSFORM INTO AN EQUATION the peremeter P of a square equals four times the length of a side A1 solutions Answer 283651 by sofiyac(695)   on 2011-01-27 15:59:25 (Show Source): You can put this solution on YOUR website!P=4A
 Proofs/399970: What is the law of material implication?1 solutions Answer 283650 by sofiyac(695)   on 2011-01-27 15:59:06 (Show Source): You can put this solution on YOUR website!~~q v ~~s