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Recent problems solved by 'Fombitz'

Fombitz answered: 13805 problems
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Expressions-with-variables/335290: Please help me write an algebraic expression for the following word phrase 8 less than the product of a number x and 4 1 solutions Answer 240341 by Fombitz(13828)   on 2010-08-26 15:30:05 (Show Source): You can put this solution on YOUR website! "product of a number x and 4", "8 less than the product of a number x and 4",

Radicals/335301: sqrt(1x-1)+8=8x 1 solutions Answer 240340 by Fombitz(13828)   on 2010-08-26 15:28:53 (Show Source): You can put this solution on YOUR website! Square both sides. Two solutions: . . .

Numbers_Word_Problems/335299: How many whole numbers are there, such that if its digits are reversed and then subtracted from the original number, the result is 198? 1 solutions Answer 240339 by Fombitz(13828)   on 2010-08-26 15:20:59 (Show Source): You can put this solution on YOUR website! Let the original number be ABC, where the numerical value is . The reverse number would be CBA or numerically . . . A, B, and C can take on values from to . For each value of B, there are A,C values. So there would be or number pairs that meet this criteria. If leading zeros aren't allowed (like 012/210), then reduce the B values allowed by 1, and then or 72 number pairs are allowed.

Human-and-algebraic-language/335307: If a car travels 280 miles at 55 mph, how many hours is that? 1 solutions Answer 240336 by Fombitz(13828)   on 2010-08-26 15:06:46 (Show Source): You can put this solution on YOUR website! Rate*Time=Distance Finish the calculation to get the answer in hours.

Mixture_Word_Problems/335306: a certain alloy contails 75% copper and a second alloy 35% copper. how many kilograms of the second alloy must be added to 62 kilograms of the first to form an alloy that is 50% copper? 1 solutions Answer 240335 by Fombitz(13828)   on 2010-08-26 15:05:46 (Show Source): You can put this solution on YOUR website! Let A be the amount of 35% alloy. kg

Square-cubic-other-roots/335297: How do you write this so that there isn't a fraction in a fraction? (I tried to use the formula to make it show up better but it wouldn't work, so hopefully this way appears right) 1 --------- 1-(x/y) Thanks for the help! 1 solutions Answer 240332 by Fombitz(13828)   on 2010-08-26 14:49:03 (Show Source): You can put this solution on YOUR website! Mutliply numerator and denominator by .

Probability-and-statistics/335287: Your statistics tutor wants you to determine a confidence interval estimate for the mean score in next exam. In the past the scores have been distributed normally with a mean of 74.2 and a standard deviation of 30.9. A 95% confidence interval if your class has 30 students is 1. (68.72;79.68) 2. (13.64;34.76) 3. (64.92;83.48) 4. (63.14;85.26) 5. (62.66;85.73) 1 solutions Answer 240326 by Fombitz(13828)   on 2010-08-26 14:34:10 (Show Source): You can put this solution on YOUR website! First find the standard error of the mean, . . (,)=(,) . . (,)=(,)

Graphs/335293: Hello the problem I have is "find the domain of the function." g(x)=1/(6-7x) Can you tell me if I have the answer right? x≠6/7 Thank you for your help! :) 1 solutions Answer 240324 by Fombitz(13828)   on 2010-08-26 14:27:41 (Show Source): You can put this solution on YOUR website! Yes, that's correct, x can be any value except since that would lead to the undefined division by zero.

Equations/335291: 9(z-3)=12z 1 solutions Answer 240323 by Fombitz(13828)   on 2010-08-26 14:26:22 (Show Source): You can put this solution on YOUR website!

Square-cubic-other-roots/335292: I can't remember how to do this equation correctly... I need to switch it to a fraction Thanks for the help! 1 solutions Answer 240322 by Fombitz(13828)   on 2010-08-26 14:23:52 (Show Source): You can put this solution on YOUR website!

Equations/334318: find all solutions for the equation absolute value of 6v+3 is equal to 15 1 solutions Answer 240321 by Fombitz(13828)   on 2010-08-26 14:14:17 (Show Source): You can put this solution on YOUR website! Two solutions: positive and negative. and and and

Exponents/334178: how do i write eachproduct using an exponent, then find the value of the power... to 4.4.4.4 1 solutions Answer 240320 by Fombitz(13828)   on 2010-08-26 14:12:32 (Show Source): You can put this solution on YOUR website! The exponent signifies how many times to multiply the base together.

Linear-equations/334570: what is the line parallel to the line 2x-5y=0 and with a x-intercept of 6? 1 solutions Answer 240319 by Fombitz(13828)   on 2010-08-26 14:10:36 (Show Source): You can put this solution on YOUR website! The parallel line would have the same left hand side. Find using the x-intercept information. When , . . . .

Equations/335288: slove for x 7y-2x=9 1 solutions Answer 240318 by Fombitz(13828)   on 2010-08-26 14:08:34 (Show Source): You can put this solution on YOUR website! Subtract from both sides. Divide both sides by .

Square-cubic-other-roots/335286: I need to say what is wrong with this statement: Would it be that it should be = ? Thanks for the help! 1 solutions Answer 240317 by Fombitz(13828)   on 2010-08-26 14:05:40 (Show Source): You can put this solution on YOUR website! Square both sides. So the above equality only holds if either x or y or both are zero. Otherwise you're missing the 2xy term.

Proportions/334197: I need to find the LCD for the rational expressions and convert each into equivalent rational expressions with the LCD as the denominator. Help! I'm stumped! Thank you so very much! (4)/(x-y),(5x)/(2y-2x) 1 solutions Answer 240315 by Fombitz(13828)   on 2010-08-26 14:02:04 (Show Source): You can put this solution on YOUR website! The LCD is .

Points-lines-and-rays/335282: M is the midpoint of JK (segment) , JM = x/8 and JK = (3x/4) - 6 find MK ? 1 solutions Answer 240314 by Fombitz(13828)   on 2010-08-26 13:58:17 (Show Source): You can put this solution on YOUR website!

Graphs/334204: How do you find the center, radius, and x and y intercepts of 3x^2-3y^2-6x-12y=0? 1 solutions Answer 240313 by Fombitz(13828)   on 2010-08-26 13:56:22 (Show Source): You can put this solution on YOUR website! Complete the square in x and y. . . . It's not a circle, it's a hyperbola, so it has no radius. It's centered at (1,2). . . . . . . To find the x-intercepts, set y=0 and solve for x. (0,0) and (2,0) . . . To find the y-intercepts, set x=0 and solve for y. (0,0) and (0,-4) . . .

Quadratic_Equations/335279: Determine the value of y in the following equation: y = sec (3) (0) 1 solutions Answer 240312 by Fombitz(13828)   on 2010-08-26 13:47:13 (Show Source): You can put this solution on YOUR website! Is that the sec(3) multiplied by zero?

Miscellaneous_Word_Problems/333972: A jar contains quarters and dimes. It contains one more than five times as many quarters as dimes. The money in the jar totals $4.30, how many dimes and quarters are in the jar? 1 solutions Answer 240311 by Fombitz(13828)   on 2010-08-26 13:46:35 (Show Source): You can put this solution on YOUR website! Let D be the number of dimes, Q quarters. 1. . . . 2. Substitute eq. 1 into eq. 2, . . . Then from eq. 1, . . . 16 quarters and 3 dimes.

Rectangles/334195: the sides of a triangle are in the ratio 3:4:5. what is the length of each side if the permiter of the triangle is 30cm. 1 solutions Answer 240309 by Fombitz(13828)   on 2010-08-26 13:43:04 (Show Source): You can put this solution on YOUR website! . . . cm cm cm

Mixture_Word_Problems/335272: Alex received scores of 82 and 88 on his first two quizzes. What average score does he need on the next two quizzes to achieve a final average score of 90, if all four scores are weighted equally? 1 solutions Answer 240307 by Fombitz(13828)   on 2010-08-26 13:35:40 (Show Source): You can put this solution on YOUR website! . . . . . . . . . Alex needs to average a 95 on the final 2 tests.

Linear-systems/335242: Please assist me in solving this system by the addition method. Thank you. x + y = 7 x - y = 9 1 solutions Answer 240306 by Fombitz(13828)   on 2010-08-26 13:33:39 (Show Source): You can put this solution on YOUR website! Add the equations together. Now use either equation to solve for y.

Linear-systems/335254: Please assist me in solving this system by the addition method. Thank you. 3x + 5y = -11 x - 2y = 11 1 solutions Answer 240303 by Fombitz(13828)   on 2010-08-26 13:29:58 (Show Source): You can put this solution on YOUR website! 1. 2. Multiply eq. 2 by (-3) and add the equations, Then use either equation to solve for x.

Linear-equations/335261: x/x^2-9 + 4/x+3 = 3/x^2-9 My answer is x^2=9 May I please ask for assistance? Thank you in advance. 1 solutions Answer 240301 by Fombitz(13828)   on 2010-08-26 13:26:47 (Show Source): You can put this solution on YOUR website! You don't show any steps of how you got to your answer and it's not a final answer either. cannot be solution since it would lead to a division by zero. . . . Use the common denominator, No solution.

Probability-and-statistics/335273: The ages of 25 employees in a company are listed below in a stem and leaf plot. What is the probability that a worker chosen at random will have an age greater than or equal to 30 and less than or equal to 39? 2 0 2 6 7 9 3 0 3 4 5 6 8 8 9 9 4 2 4 5 6 7 5 2 3 4 7 6 1 3 1 solutions Answer 240299 by Fombitz(13828)   on 2010-08-26 13:21:25 (Show Source): You can put this solution on YOUR website! There are total values. There are values between and .

Equations/335269: a bank teller has 125 $10 and $5 bills to start a day. If the total value of the bills was $1000, how many $5 bills did the teller have? 1 solutions Answer 240298 by Fombitz(13828)   on 2010-08-26 13:19:36 (Show Source): You can put this solution on YOUR website! Let T be the number of $10 bills, and F be the number of $5 bills. 1. 2. Multiply eq. 1 by -5 and add the two equations. Then from eq. 1, . . . 75 $10 bills and 50 $5 bills.

Circles/335270: The diameter of a circle is 1.3 X 10-^12 meters, then what is its radius. 1 solutions Answer 240297 by Fombitz(13828)   on 2010-08-26 13:16:25 (Show Source): You can put this solution on YOUR website! The radius is 1/2 of the diameter.

Square-cubic-other-roots/335271: log 5th SQRT (10) 1 solutions Answer 240296 by Fombitz(13828)   on 2010-08-26 13:15:56 (Show Source): You can put this solution on YOUR website!

Numeric_Fractions/334255: (a^-3b^2c)^-2/(ab^-2c^3)^-1 1 solutions Answer 240276 by Fombitz(13828)   on 2010-08-26 11:04:52 (Show Source): You can put this solution on YOUR website! . . . . . . . .

Polynomials-and-rational-expressions/334201: Hi, I am having issues solving this kind of problems. Any help and suggestion is greatly appreciated. Simplify the expression, using only positive exponents in your answer: x^-8+y^-8 --------- x^-1+y^-1 Thanks! 1 solutions Answer 240274 by Fombitz(13828)   on 2010-08-26 10:59:34 (Show Source): You can put this solution on YOUR website! Multiply numerator and denominator by and simplify.