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# Recent problems solved by 'Alan3354'

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 Equations/668396: A^2X^2-B^2Y^21 solutions Answer 415562 by Alan3354(30959)   on 2012-10-18 12:45:45 (Show Source): You can put this solution on YOUR website!A^2X^2-B^2Y^2 ---------------- Do you have a question?
 Complex_Numbers/668409: - (square root) -481 solutions Answer 415528 by Alan3354(30959)   on 2012-10-18 11:36:08 (Show Source): You can put this solution on YOUR website! = =
 Travel_Word_Problems/668420: If a witch flies at 16 miles per hour and it takes her a half hour to get there, how long will it take to fly home if she travels 24 miles per hour?1 solutions Answer 415527 by Alan3354(30959)   on 2012-10-18 11:33:44 (Show Source): You can put this solution on YOUR website!If a witch flies at 16 miles per hour and it takes her a half hour to get there, -------- Find the distance d = r*t ----------------------------- how long will it take to fly home if she travels 24 miles per hour? d = r*t t = d/r
 test/668410: Write the equation in slope-intercept form. What are the slope and y-intercept? 3/4x+4/5y=41 solutions Answer 415518 by Alan3354(30959)   on 2012-10-18 10:47:05 (Show Source): You can put this solution on YOUR website!Write the equation in slope-intercept form. What are the slope and y-intercept? 3/4x+4/5y=4 --------------- Multiply by 20 15x + 16y = 80 Solve for y
 Equations/668399: I know the answer to this question but do not know how to show the work Solve for b when b+ -3 = 121 solutions Answer 415517 by Alan3354(30959)   on 2012-10-18 10:45:36 (Show Source): You can put this solution on YOUR website!Solve for b when b+ -3 = 12 ---------------- Add 3 to both sides
 absolute-value/668354: asquared-bsquared what are the not true values1 solutions Answer 415516 by Alan3354(30959)   on 2012-10-18 10:44:42 (Show Source): You can put this solution on YOUR website!asquared-bsquared what are the not true values --------- Values for what to be not true?
 Expressions-with-variables/668324: 5n+20n=5(n+20) 5n+20n=5(n+20) 27n=100+5n 27n/5=100+5n/5 ?=20+n I do not know where to go from here or how to make sense of this1 solutions Answer 415515 by Alan3354(30959)   on 2012-10-18 10:42:22 (Show Source): You can put this solution on YOUR website!5n+20n=5(n+20) 5n+20n=5(n+20) 27n=100+5n ****************** 25n = 5n + 100, not 27n 20n = 100 n = 5
 Points-lines-and-rays/668381: Angle 2 is congruent to angle 101 solutions Answer 415502 by Alan3354(30959)   on 2012-10-18 09:45:15 (Show Source): You can put this solution on YOUR website!Angle 2 is congruent to angle 10 ----------------- We're happy to hear that.
 Functions/668382: Find the inverse of f(x)=2^x. Here is where I went with this. Change f(x) to y so it would read y=2^x. Interchange the y and x to get x=2^y. I don't know how to write this on here, but you would take the y square root of x and the y square root of 2^y to get y square root of x=2. This is where I get stuck. Thanks!1 solutions Answer 415501 by Alan3354(30959)   on 2012-10-18 09:41:12 (Show Source): You can put this solution on YOUR website!Find the inverse of f(x)=2^x. Here is where I went with this. Change f(x) to y so it would read y=2^x. Interchange the y and x to get x=2^y. --------------- x=2^y ln(x) = y*ln(2) y = ln(x)/ln(2) Or
 Circles/668370: PROBLEM: A Cylindrical soup cup is 4 inches in diameter. h=v/(pi x r to the second power) (use the value pi = 22/7 How many inches high must it be to hold 2 cups (28 7/8 cu. in.) if an additional 1/2 inch is added to height for the rim?1 solutions Answer 415490 by Alan3354(30959)   on 2012-10-18 08:39:55 (Show Source): You can put this solution on YOUR website!A Cylindrical soup cup is 4 inches in diameter. h=v/(pi x r to the second power) (use the value pi = 22/7 How many inches high must it be to hold 2 cups (28 7/8 cu. in.) if an additional 1/2 inch is added to height for the rim? ------------------- r = 2 inches Add 0.5 inches to h
 Trigonometry-basics/668348: Indicate the appropriate quadrant for cos<0 and cot>0. *I tried to use this one formula called "All Students Take Calculus" but I'm still struggling in trying to find the quadrant. 1 solutions Answer 415489 by Alan3354(30959)   on 2012-10-18 08:34:38 (Show Source): You can put this solution on YOUR website!Indicate the appropriate quadrant for cos<0 and cot>0. ---------- cos + - - + cot + - + - --> Q3
 Trigonometry-basics/668343: (3x-5)×{(3x-5)×3x-5}1 solutions Answer 415481 by Alan3354(30959)   on 2012-10-18 07:51:46 (Show Source): You can put this solution on YOUR website!(3x-5)×{(3x-5)×3x-5} ------- =
 test/668345: y=0.3x+0.421 solutions Answer 415478 by Alan3354(30959)   on 2012-10-18 07:47:29 (Show Source): You can put this solution on YOUR website!y=0.3x+0.42 --------- Do you have a question?
 Trigonometry-basics/668234: How to simplify cos(^2)x/1+sinx1 solutions Answer 415389 by Alan3354(30959)   on 2012-10-17 21:23:14 (Show Source): You can put this solution on YOUR website!How to simplify cos(^2)x/1+sinx --------- Use the Pythagorean Identity
 Pythagorean-theorem/668168: what is the length of the hypotenuse of a right triangle with legs of length 15 and 361 solutions Answer 415355 by Alan3354(30959)   on 2012-10-17 20:01:25 (Show Source): You can put this solution on YOUR website!what is the length of the hypotenuse of a right triangle with legs of length 15 and 36 ------------
 absolute-value/668147: Solve the absolute value inequality? |8x-1|-7>-11 A.(-3\8,∞) b.(-3/8,5/8) C.(-∞,∞) D. NO SOLUTION Prof told me the answer is D, but I dont know why?1 solutions Answer 415352 by Alan3354(30959)   on 2012-10-17 19:47:35 (Show Source): You can put this solution on YOUR website!|8x-1|-7>-11 Add 7 |8x-1| > -4 ------------- There's no unique solution since the ABS is always >= 0, never negative. --> for any x it is true. That's C.
 Linear-systems/668059: 5x+3y+2z=-4 -5x-4y-2z=7 4x+2y+2z=-2 Solve with substitution or elimination1 solutions Answer 415334 by Alan3354(30959)   on 2012-10-17 17:59:28 (Show Source): You can put this solution on YOUR website!5x+3y+2z=-4 -5x-4y-2z=7 4x+2y+2z=-2 ------------- Add the middle eqn to the others to eliminate the z terms. Then you have a system in x & y. ------------ I don't need the practice, but I'll check your work.
 Polygons/668016: How many sides does a regular polygon have if one of the exterior angles is 10°?1 solutions Answer 415327 by Alan3354(30959)   on 2012-10-17 17:49:26 (Show Source): You can put this solution on YOUR website!How many sides does a regular polygon have if one of the exterior angles is 10°? --------- 360/10 = 36 sides
 Rational-functions/668049: ineed ur help on binomils, plz plz i am dying what is the slope of a binomial 56x-81 solutions Answer 415326 by Alan3354(30959)   on 2012-10-17 17:47:16 (Show Source): You can put this solution on YOUR website!ineed ur help on binomils, plz plz i am dying what is the slope of a binomial 56x-8 ------------ Binomials don't have a slope. Slope is the change in y divided by the change in x. A linear equation in x & y gives a straight line graph, and has a slope.
 Numbers_Word_Problems/668050: what odd number multiply to equal 440?1 solutions Answer 415322 by Alan3354(30959)   on 2012-10-17 17:42:29 (Show Source): You can put this solution on YOUR website!what odd number multiply to equal 440? ---------- Multiplying odd numbers gives odd numbers.
 Geometric_formulas/668053: 2+21 solutions Answer 415320 by Alan3354(30959)   on 2012-10-17 17:41:44 (Show Source): You can put this solution on YOUR website!2+2 ------- That's soooooo funny. Your future in comedy is certain.
 Volume/668043: I need to know how many paperclips are in a jar with a capacity of 6.5L, whereby an individual paperclip is 2 inches in length and 0.5 inches in width1 solutions Answer 415316 by Alan3354(30959)   on 2012-10-17 17:30:57 (Show Source): You can put this solution on YOUR website!6.5 liters is a volume. ------ To find the volume of each clip, you need to add the wire thickness to L & W. Don't expect to be able to get an accurate or exact number. To do that, use a weighing scale.
 Linear-systems/668034: -4x+4y=-8 x-4y=-7 Need to solve using system of elimination1 solutions Answer 415313 by Alan3354(30959)   on 2012-10-17 17:26:41 (Show Source): You can put this solution on YOUR website!-4x + 4y=-8 +1x - 4y=-7 ------------- Add
 Linear-equations/668017: find three points that solve the equation 3x-4y= -18 then plot them on the graph1 solutions Answer 415310 by Alan3354(30959)   on 2012-10-17 17:20:14 (Show Source): You can put this solution on YOUR website!duplicate, or similar
 Linear-equations/668025: find three points that solve the equation -3y= -2x-6 to plot on a graph1 solutions Answer 415309 by Alan3354(30959)   on 2012-10-17 17:19:21 (Show Source): You can put this solution on YOUR website!find three points that solve the equation -3y= -2x-6 to plot on a graph ---------- Solve for y (or x) -3y= -2x-6 y = (2/3)x + 2 Pick 3 values of x and find y. If you choose x as multiples of 3, you won't get fractions. Plot the points. Draw a line thru them.
 Travel_Word_Problems/667906: You are riding in a train that is traveling at a speed of 120 km/h.How long will it take to travel 950 km?1 solutions Answer 415270 by Alan3354(30959)   on 2012-10-17 14:56:18 (Show Source): You can put this solution on YOUR website!You are riding in a train that is traveling at a speed of 120 km/h.How long will it take to travel 950 km? ----------------- d = r*t t = d/r
 logarithm/667909: Simultaneous equation with logarithims: Solve for x and y the following: Log(2x-5y) = 0; 2Logy = Log(x+1)1 solutions Answer 415262 by Alan3354(30959)   on 2012-10-17 14:30:04 (Show Source): You can put this solution on YOUR website!Solve for x and y the following: Log(2x-5y) = 0; --> 2x - 5y = 1 --------------- 2Logy = Log(x+1) log(y^2) = log(x+1) y^2 = x+1 x = y^2 - 1 ------- 2x - 5y = 1 Sub for x 2(y^2-1) - 5y = 1 2y^2 - 5y -3 = 0 (2y + 1)*(y - 3) = 0 y = 3, x = 8 ============== y = -1/2, x = -3/4
 Polygons/667919: find the number of sides of a regular polygon each of whose exterior angles contains 30 degrees1 solutions Answer 415259 by Alan3354(30959)   on 2012-10-17 14:22:39 (Show Source): You can put this solution on YOUR website!find the number of sides of a regular polygon each of whose exterior angles contains 30 degrees ---------------- 360/30 = 12 sides
 Linear-equations/667902: Determine the equation of each line. Write the answer in standard form using only integers as the coefficients. The line through (-2,0) with slope -3/4 I have a couple of things worked out on this. I am really confused on this. This is what I have: m=-3/4 points (-2,0) x=-3/4y-2 4*(3/4 + x)= -2*4 3y+4x=-8 and I also tried it this other way by plugging in the information I had: y=mx+b 0=-3/4(-2)+b 0=6/4+b -6/4=b y=-3/4x-6/4 1 solutions Answer 415258 by Alan3354(30959)   on 2012-10-17 14:21:12 (Show Source): You can put this solution on YOUR website!Determine the equation of each line. Write the answer in standard form using only integers as the coefficients. The line through (-2,0) with slope -3/4 I have a couple of things worked out on this. I am really confused on this. This is what I have: m=-3/4 points (-2,0) x=-3/4y-2 4*(3/4 + x)= -2*4 3y+4x=-8 *************** That won't work. ================================= and I also tried it this other way by plugging in the information I had: y=mx+b 0=-3/4(-2)+b 0=6/4+b -6/4=b y=-3/4x-6/4 ------------------ This is correct. y = (-3/4)x - 3/2 (slope-intercept form) Get rid of fractions, multiply by 4 4y = -3x - 6 3x + 4y = -6 in "standard form"
 Expressions-with-variables/667831: x+y=5 and xy=4 find x-y?1 solutions Answer 415208 by Alan3354(30959)   on 2012-10-17 10:11:26 (Show Source): You can put this solution on YOUR website!x+y=5 and xy=4 find x-y? ---------- x*(5-x) = 4 x = 1, y = 4 --> x-y = -3 x = 4, y = 1 --> x-y = 3
 Complex_Numbers/667803: find the square root of (1-2 sq rt 2i)?1 solutions Answer 415204 by Alan3354(30959)   on 2012-10-17 10:06:04 (Show Source): You can put this solution on YOUR website!find the square root of (1-2 sq rt 2i)? ----------------- Angle = atan(sqrt(8)) =~ 70.5288 z = 3cis(70.5288) sqrt(z) = sqrt(3)cis(35.2644) sqrt(z) = sqrt(3)*sqrt(2/3) + i*sqrt(3)*sqrt(1/3) = sqrt(2) + i