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# Recent problems solved by 'solver91311'

solver91311 answered: 16856 problems
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 Geometry_proofs/713804: PROVE: (Solve only one side until it matches the other) [(sinA)/(cosA)][(1-sinA)/(cosA)]=11 solutions Answer 438572 by solver91311(16868)   on 2013-02-12 18:10:47 (Show Source): You can put this solution on YOUR website! The two sides are NOT identical, in fact they are NEVER equal. Attempt to solve the equation: Using the Pythagorean Identity: Which is to say then But is excluded from the domain of the original equation. Therefore, there are no real number solutions to the given equation and given that infinite number of counterexamples, the original equation is not an identity. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Finance/713816: Hi, I'd like some help with the following question. A student requires an immediate bank overdraft of €2500. His bank agrees but requires that it is repaid by 18 month instalments starting at the end of this month at a rate of interest of 1.5% a month. How much must each instalment be? I used this formula to find m m((1+i)^t-1)/i but my answer doesn't match the answer given. Given answer:(€159.51) Regards Brian1 solutions Answer 438568 by solver91311(16868)   on 2013-02-12 17:46:41 (Show Source): You can put this solution on YOUR website! Wrong formula. You need: John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Finance/713813: Hi, I'd appreciate some help with these questions please. 7. Derek is saving for his daughter’s wedding in 2 years time. He decides to save either (a) €150 a month starting at the end of the current month at a nominal rate of 6% a year compounded monthly or (b) €460 a quarter starting at the end of the current month at a nominal rate of 6% a year compounded quarterly I've used the formula m((1+i)^t-1)/i my answer to part (a) matches the sample answer given but my answer to paer (b) doesn't. Answers given: (a) €3814.79 (b) 3794.78) Regards Brian1 solutions Answer 438567 by solver91311(16868)   on 2013-02-12 17:39:34 (Show Source): You can put this solution on YOUR website! My answer for part b is $3879.11. Maybe your given answer for b) is a misprint. Interestingly enough,$3794.78 is the FV of \$450 per quarter for 8 quarters at 6% per annum compounded quarterly. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Mixture_Word_Problems/713810: How do you make an equation for: 80% of what number is 64? What is 65% of 200?1 solutions Answer 438566 by solver91311(16868)   on 2013-02-12 17:22:03 (Show Source): You can put this solution on YOUR website! John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Systems-of-equations/713798: Melinda's father Lester is 3 times as old as Melinda. Seven years ago, he was 4 times as old as Melinda. How old is each now? I set it up like this: 3m = L 4m = L - 7 So 4m = 3m - 7 But then I get m = -7 Which makes no sense to me. Please help1 solutions Answer 438565 by solver91311(16868)   on 2013-02-12 17:01:31 (Show Source): You can put this solution on YOUR website! The only way this works is if you left out some important words in the problem. It should have read "Melinda's father Lester is 3 times as old as Melinda. Seven years ago, he was 4 times as old as Melinda was seven years ago. How old is each now? Then, presuming represents Lester's age now and represents Melinda's age now, you can say that Lester was seven years ago and Melinda was seven years ago. Hence: and I'm guessing that you can handle it from here. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Quadratic_Equations/713796: i am having difficulty solving the following 1/2x squared -x +5 =01 solutions Answer 438564 by solver91311(16868)   on 2013-02-12 16:50:38 (Show Source): You can put this solution on YOUR website! Use the quadratic formula: John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Travel_Word_Problems/713790: if a course is 80 miles and i rode 44 miles of it what percentage have i rode so far?1 solutions Answer 438561 by solver91311(16868)   on 2013-02-12 16:40:55 (Show Source): You can put this solution on YOUR website! Divide 44 by 80 and then move the decimal point 2 places to the right. And the past participle of "ride" is "ridden", not "rode". John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Geometry_proofs/713776: How do you solve this equation? Given: 3(x+4)-2(y+2)=3 Prove: y= 3/2x + 5/21 solutions Answer 438559 by solver91311(16868)   on 2013-02-12 16:39:34 (Show Source): You can put this solution on YOUR website! Distribute the 3, then distribute the -2 Add -12 to both sides. Add 4 to both sides. Add -3x to both sides. Multiply both sides by John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Functions/713785: f(x)= square root of 2x-74 f(x)= square root of 7+x g(x)= square root 7-x h(x)= 20x + 18 -15 less than equal to x less than equal to 4 1 over square root of 3x + 20 f(x)= x +10 over x^2 - 196 these are my 5 problems1 solutions Answer 438558 by solver91311(16868)   on 2013-02-12 16:35:31 (Show Source): You can put this solution on YOUR website! And thank you so very much for sharing. Even though you are only allowed one problem per post, you didn't ask a question about any of your problems. Repost, one problem at a time, and tell us what it is that you are required to do, what it is that you don't understand, and show what you have tried already. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Average/713786: if the mean of a problem is 30 what's the value of x in 78,77,84,81,x1 solutions Answer 438556 by solver91311(16868)   on 2013-02-12 16:33:07 (Show Source): You can put this solution on YOUR website! If the mean of a set of data values is , then the sum of the data values must be John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Linear-systems/713781: Y=p+q+r/4. The solution is q=?1 solutions Answer 438555 by solver91311(16868)   on 2013-02-12 16:31:10 (Show Source): You can put this solution on YOUR website! Depends. Are you trying to solve or ? John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Geometry_Word_Problems/713782: The area of circle P is 4 times pie. The area of circle Q is 25 times pie. What is the ratio of their radii? p.s. I don't know what a radii is.1 solutions Answer 438554 by solver91311(16868)   on 2013-02-12 16:28:07 (Show Source): You can put this solution on YOUR website! radii is the plural of radius. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Numbers_Word_Problems/713754: math problem... i am a 3 digit number, i am greater than 400 and less than 600, the digit in the tens is 1 greater than the digit in the hundreds, the sum of the digits is 12, so what number am i???? need some help with this problem please....1 solutions Answer 438547 by solver91311(16868)   on 2013-02-12 15:46:53 (Show Source): You can put this solution on YOUR website! Greater than 400 and less than 600, so the number has to be in the range 401 through 599. Consequently the hundreds digit is either 4 or 5. If it is 4, then the tens digit has to be 5. 4 plus 5 is 9. Then since 12 - 9 = 3, the number has to be 453. But if the hundreds digit is 5, then the tens digit has to be 6. 5 plus 6 is 11, and since 12 - 11 = 1. Then the number has to be 561. So either 453 or 561 fits the criteria given. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Exponential-and-logarithmic-functions/713748: I have a Key Assignment for Algebra 2, and I must answer the following questions without the use of a calculator. Solve 2log x+log4=2 without the use of a calculator. 1 solutions Answer 438542 by solver91311(16868)   on 2013-02-12 15:39:46 (Show Source): You can put this solution on YOUR website! Multiply both sides by Use to write Use "The sum of the logs is the log of the product" to write: Use the definition of logarithms to write: Then John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Functions/713746: how do you solve -4(f(-1)) given f(x)=4x-71 solutions Answer 438532 by solver91311(16868)   on 2013-02-12 15:22:17 (Show Source): You can put this solution on YOUR website! I already did this one. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Quadratic_Equations/713736: 1/2xsquared-4+5=0 How do I find the Zeros/x-intercepts for this equation?1 solutions Answer 438531 by solver91311(16868)   on 2013-02-12 15:19:44 (Show Source): You can put this solution on YOUR website! I think you are missing an x. By the way use ^ to indicate raising to a power. For example x^2 means x squared. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 test/713728: What happened to the baseball player who was unfaithful to his wife?1 solutions Answer 438529 by solver91311(16868)   on 2013-02-12 15:18:11 (Show Source):
 Functions/713741: how do you solve -4(f(-1)) given f(x)=4x+-71 solutions Answer 438526 by solver91311(16868)   on 2013-02-12 15:16:34 (Show Source): You can put this solution on YOUR website! Substitute -1 for x. Do the arithmetic. Multiply the result by -4. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Equations/711831: y varies directly as the square of x. When x = 2, y = 40. Find x when y = 6401 solutions Answer 437660 by solver91311(16868)   on 2013-02-07 17:15:57 (Show Source): You can put this solution on YOUR website! varies directly as the square of so: Substitute 2 for and 40 for . Then solve for Once you have determined a value for , substitute that value for and 640 for , then solve for John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Equations/711838: 1. 6(x+3)-(x+4)=-11 1 solutions Answer 437658 by solver91311(16868)   on 2013-02-07 17:12:19 (Show Source): You can put this solution on YOUR website! Distribute the 6 across the parentheses. Distribute the -1 across the other set of parentheses. Collect like terms, i.e. 6x - x and 3 - 4. Add 1 to both sides of the equation. Multiply both sides by John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Linear-equations/711841: what is the slope intercept form of the linear equation with a graph that passes through (-3,4) and is perpendicular to 4x+y=16.1 solutions Answer 437657 by solver91311(16868)   on 2013-02-07 17:08:28 (Show Source): You can put this solution on YOUR website! Put the given equation into slope-intercept form so that you can determine the slope of the line represented by the given equation. Since perpendicular lines have negative reciprocal slopes, take the opposite of the reciprocal of the slope you just calculated and that is the slope of the desired line. Then use the point-slope form: where are the coordinates of the given point and is the calculated slope. Solve the result for in terms of everything else to put the result in slope-intercept form. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Graphs/711842: what is the slope of(2,5),(-8,5) 1 solutions Answer 437655 by solver91311(16868)   on 2013-02-07 17:04:05 (Show Source): You can put this solution on YOUR website! Use the slope formula: where and are the coordinates of the given points. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Inequalities/711839: Please help me with this problem: Jumping rope can burn 600 calories per hour. Write and solve an inequality to find the number of hours jumping rope that it would take for you to burn at least 450 calories. I do not understand this problem for some reason and nobody is here to help me and this is due tomorrow. Please help me.1 solutions Answer 437654 by solver91311(16868)   on 2013-02-07 17:03:08 (Show Source): You can put this solution on YOUR website! What is the reason you don't understand the problem? John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Geometry_Word_Problems/711837: the midpoint of KL is M(-8,1). one endpoint is K(-6,5). find the coordinates of the other endpoint L.1 solutions Answer 437651 by solver91311(16868)   on 2013-02-07 17:00:17 (Show Source): You can put this solution on YOUR website! and So and Solve for and John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Average/711793: Find the average rate of change. f(x)= the square root of 2x from X1=2 to X2=8 I am so confused can you please show the steps please?1 solutions Answer 437650 by solver91311(16868)   on 2013-02-07 16:56:58 (Show Source): You can put this solution on YOUR website! The average rate of change of a function between two points is the same as the slope of the secant line that passes through the two points. The only difference is the notation of the slope formula. You are probably used to seeing the slope formula as: where and are the coordinates of the given points. But since you have started working with functions, stop thinking of ordered pairs that represent points in the plane as . Rather, consider them to be represented as . That makes your average rate of change formula look like: In your particular case, you need to calculate the value of: John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Linear-equations/711815: Find three equations that have an x-intercept at (1,0)1 solutions Answer 437637 by solver91311(16868)   on 2013-02-07 16:17:31 (Show Source): You can put this solution on YOUR website! I'll do you one better. Here are ALL of the linear equations mapped to that contain the point : Just pick any three real values for that you like. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Triangles/711813: two side with length 15 and one side with the length 251 solutions Answer 437633 by solver91311(16868)   on 2013-02-07 16:10:22 (Show Source): You can put this solution on YOUR website! Yeah, what about it? Did you have a question? What is it that you don't understand? What have you tried? What is it about the instructions for posting on this website that makes it so difficult to read, understand, and follow the instructions for posting questions? Or are you just lazy? John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Functions/711810: I missed a class when sick and now have no idea what or how to do problems that say: Write the domain of the given function using interval notation. f(x)= x-31 solutions Answer 437629 by solver91311(16868)   on 2013-02-07 16:07:55 (Show Source): You can put this solution on YOUR website! It is a polynomial function, so the domain is all real numbers. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Equations/711800: Hi. My name is Allen and I've been having difficulty with this problem. I sent this equation to this website a few days ago but no response. I came up with 7/9 hours, which is incorrect. Here is the equation: A swimming pool can be filled by either or both of two pipes of different diameters. It takes the smaller pipe twice the time that the larger pipe takes to fill the pool. If water flows through both pipes it take 2 1/3 hours to fill the pool. How long will it take the larger pipe to fill the pool? [hint: let x be the amount of the pool filled by the small pipe in one hour] Time = ______ hours Thank you!1 solutions Answer 437625 by solver91311(16868)   on 2013-02-07 16:03:20 (Show Source): You can put this solution on YOUR website! Let represent the number of hours it takes for the larger pipe to fill the pool. That means that the larger pipe can fill th of the pool in one hour. Likewise, the smaller pipe, that takes hours to fill the pool, can fill of the pool in one hour. Working together, they fill the pool in hours, or hours. That means that the two pipes working together can fill of the pool in one hour. Since what one of the pipes can do in one hour plus what the other pipe can do in one hour is equal to what they can do together in one hour, we can say: Solve for John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it
 Rectangles/710310: The Perimeter of a rectangle is 27 inches. The ratio of the length to the width is 2:1. Find the length and the width of the triangle1 solutions Answer 436966 by solver91311(16868)   on 2013-02-04 17:49:12 (Show Source): You can put this solution on YOUR website! Is your problem about a rectangle or a triangle. Pay attention and READ what you have written BEFORE you hit send. John Egw to Beta kai to Sigma My calculator said it, I believe it, that settles it