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# Recent problems solved by 'Alan3354'

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 Circles/402418: What Is The Circumzference Of C=3.14d1 solutions Answer 284653 by Alan3354(30993)   on 2011-01-31 18:16:10 (Show Source): You can put this solution on YOUR website!That is the circumference. d = diameter
 test/402359: what's the cubed root of 1/61 solutions Answer 284643 by Alan3354(30993)   on 2011-01-31 17:30:42 (Show Source): You can put this solution on YOUR website!duplicate
 Polynomials-and-rational-expressions/402330: what is the square root of 1255? and 2x + 40-05x equals what1 solutions Answer 284642 by Alan3354(30993)   on 2011-01-31 17:29:45 (Show Source): You can put this solution on YOUR website!what is the square root of 1255? =~ 35.426 ------------ 2x + 40-05x equals what Not sure what you mean by that.
 Surface-area/402377: what is the area of a rectangle that is 3(1/3)yr by 1(2/3) yd?1 solutions Answer 284640 by Alan3354(30993)   on 2011-01-31 17:27:53 (Show Source): You can put this solution on YOUR website!= 10 ft by 5 ft = 50 sq ft
 test/402360: what's the cubed root of 1/61 solutions Answer 284638 by Alan3354(30993)   on 2011-01-31 17:26:14 (Show Source): You can put this solution on YOUR website!It's cube root, not cubed. =~ 0.5503212
 Surface-area/402354: The area of a circle is (9y^2+78y+169)(pi) square centimeters. What is the diameter of the circle (make sure answer is labeled correctly)?1 solutions Answer 284637 by Alan3354(30993)   on 2011-01-31 17:19:44 (Show Source): You can put this solution on YOUR website!r = (3y + 13) cm d = (6y + 26) cm
 Problems-with-consecutive-odd-even-integers/402363: Two numbers are reciprocals of each other. One number is 9 times as large as the other. Find the two numbers1 solutions Answer 284635 by Alan3354(30993)   on 2011-01-31 17:18:09 (Show Source): You can put this solution on YOUR website!x = 9*(1/x) = 9/x x^2 = 9 x = ± 3
 Linear-equations/402366: can you show me how to graph the function y=x-3?1 solutions Answer 284634 by Alan3354(30993)   on 2011-01-31 17:16:24 (Show Source): You can put this solution on YOUR website!It's a straight so you need 2 points. Pick 2 values for x, find y eg x = 0, y = -3 --> (0,-3) x = 3, y = 0 --> (3,0) Plot the 2 points Draw a line thru them
 real-numbers/402251: sqrt 18+ sqrt 24 divided by sqrt 61 solutions Answer 284633 by Alan3354(30993)   on 2011-01-31 17:14:47 (Show Source): You can put this solution on YOUR website!sqrt 18+ sqrt 24 divided by sqrt 6 = =
 Complex_Numbers/402369: what is (7 + 2i)(5-3i) in the powers of i1 solutions Answer 284632 by Alan3354(30993)   on 2011-01-31 17:12:08 (Show Source): You can put this solution on YOUR website!what is (7 + 2i)(5-3i) in the powers of i ---------------------- (7 + 2i)(5-3i) = 35 - 21i + 10i + 6 = 41 - 11i ------------ I don't see any powers of i
 Volume/402205: A 9in by 9in by 12in jar in the shape of a rectangular prism is completely filled with gum balls of diameter 3/4 inch. Estimate the number of gum balls in the jar, and explain your reasoning.1 solutions Answer 284539 by Alan3354(30993)   on 2011-01-31 11:35:23 (Show Source): You can put this solution on YOUR website!The jar's volume is 9*9*12 = 972 cubic inches If the gumballs are stacked with their centers on a grid, one above the other, each will occupy (3/4)^3 cubic inches = 27/64. 972/(27/64) = 2304 gumballs. ---------- Stacking is more complex, tho, and the gumballs will stack such that their centers are not vertical. The jar will hold more than 2304, maybe 2500 or 2600.
 Triangles/402140: PLEASE HURRY!!!! If you have a triangle with the sides lengths of 9 and 12, what is the third side length if you want the triangle to be~ obtuse: acute:1 solutions Answer 284531 by Alan3354(30993)   on 2011-01-31 10:51:55 (Show Source): You can put this solution on YOUR website!9^2 + 12^12 = 15^2 If the 3rd side is 15, it's a right triangle. If it's more, it obtuse, one angle > 90º If it's less, it's acute, 3 angles < 90º
 Geometry_Word_Problems/402155: a triangular area has dimensions of 90 feet by 400 feet by 410 feet; is the area a right triangle? explain your answer 1 solutions Answer 284507 by Alan3354(30993)   on 2011-01-31 08:22:07 (Show Source): You can put this solution on YOUR website! It's a right triangle.
 Trigonometry-basics/402095: Hi, please help me solve this problem: Find the exact value of tan (-60 degrees) Thanks!1 solutions Answer 284471 by Alan3354(30993)   on 2011-01-31 00:44:15 (Show Source): You can put this solution on YOUR website!= -sqrt(3)
 Trigonometry-basics/402099: Hi, please help me solve this problem: Find the exact value of cot(390 degrees) Thanks!1 solutions Answer 284470 by Alan3354(30993)   on 2011-01-31 00:43:28 (Show Source): You can put this solution on YOUR website!= cot(30) = sqrt(3)
 Trigonometry-basics/402100: Hi, please help me solve this problem: When using the inverse cosine function on a calculator, between what inclusive degrees will the answers be? Thanks!1 solutions Answer 284469 by Alan3354(30993)   on 2011-01-31 00:42:28 (Show Source): You can put this solution on YOUR website!0 to 180
 Functions/402101: g(f(x)) when f(x) = (1-x)/x and g(x) = 1/(1+x) i know the answer is x because my frustration led me to substitute a couple of numbers in for x and my result was always whatever i plugged in for x. BUT i can't figure out how to do this without subbing in a number for x. HELP PLEASE?1 solutions Answer 284466 by Alan3354(30993)   on 2011-01-31 00:27:44 (Show Source): You can put this solution on YOUR website!g(x) = 1/(1+x) f(x) = (1-x)/x --------- g(x) = 1/(1+x) Sub f(x) for x g(f(x)) = 1/(1 + (1-x)/x) = 1/(x + (1-x)/x) = 1/(1/x) = x
 Expressions-with-variables/401976: I do not understand substitution. 1 solutions Answer 284398 by Alan3354(30993)   on 2011-01-30 19:49:58 (Show Source): You can put this solution on YOUR website!Not everyone does. What do you plan to do about it?
 Travel_Word_Problems/401962: two cars start at the same time at a given point and travel in the same direction at a constant speed of 40 miles per hour and 55 miles per hour. After how long are the cars 5 miles apart? 1 solutions Answer 284396 by Alan3354(30993)   on 2011-01-30 19:49:24 (Show Source): You can put this solution on YOUR website!They separate at 15 mph (55 - 40) 5/15 = 1/3 hours
 Number-Line/401972: true or false; the absolute value of 12 is larger than the absolute value of -11 explain1 solutions Answer 284395 by Alan3354(30993)   on 2011-01-30 19:48:11 (Show Source): You can put this solution on YOUR website!True.
 Graphs/401941: find slope of (-5,4) and (3,-3)1 solutions Answer 284385 by Alan3354(30993)   on 2011-01-30 18:39:11 (Show Source): You can put this solution on YOUR website!Slope = difference in y/diff in x = (-3 - 4)/(3 -(-5)) = -7/8
 Numbers_Word_Problems/401931: I AM A SQUARE NUMBER GREATER THAN 9. ONE OF MY TWO DIGITSIS F5 MORE THAN THE OTHER. WHO AM I1 solutions Answer 284384 by Alan3354(30993)   on 2011-01-30 18:34:58 (Show Source): You can put this solution on YOUR website!16 & 49 come to mind.
 Miscellaneous_Word_Problems/401870: If 23 oz. of cereal costs \$4.97, how much is one unit?1 solutions Answer 284370 by Alan3354(30993)   on 2011-01-30 17:24:38 (Show Source): You can put this solution on YOUR website!If one unit is one ounce, it's 497/23 cents
 Expressions-with-variables/401868: 3-3(5-x)=0 I am lost as to what the first step in to solve for x 1 solutions Answer 284369 by Alan3354(30993)   on 2011-01-30 17:20:02 (Show Source): You can put this solution on YOUR website!3-3(5-x)=0 3 = 3(5-x) 1 = 5-x -4 = -x x = 4 -------- Or 3 - 15 + 3x = 0 -12 + 3x = 0 3x = 12 x = 4 ----- Do anything, get x on one side of the equal sign.
 Polynomials-and-rational-expressions/401726: solve x/x+9 - 9/x-9 = x^2+81/x^2-811 solutions Answer 284321 by Alan3354(30993)   on 2011-01-30 12:01:57 (Show Source): You can put this solution on YOUR website!solve x/x+9 - 9/x-9 = x^2+81/x^2-81 Multiply thru by x^2-81 x(x-9) - 9(x+9) = x^2 + 81 x^2 - 9x - 9x - 81 = x^2 + 81 -18x = 162 x = -9 -------- -9 makes denominators on both sides = 0 --> no solutions.
 Money_Word_Problems/401699: I paid interest in income tax last year. The amount of interest was \$11,000. My question is How much money do I have?1 solutions Answer 284320 by Alan3354(30993)   on 2011-01-30 11:56:44 (Show Source): You can put this solution on YOUR website!Not enough data.
 test/401711: Estimate how many centimeters are in 100 feet using the formula C=2.54XI A.25cm B.250cm C.2500cm D.25000cm1 solutions Answer 284317 by Alan3354(30993)   on 2011-01-30 11:51:41 (Show Source): You can put this solution on YOUR website!100 ft * 12 in/ft * 2.54 cm/in = 3048 cm exactly, not an estimate. ------------ I don't know what those other numbers mean.
 Trigonometry-basics/401678: Hi, please help me figure out this problem: When you use the inverse cosine button on your calculator, between what degrees will the answer be? Thank you!1 solutions Answer 284300 by Alan3354(30993)   on 2011-01-30 10:29:37 (Show Source): You can put this solution on YOUR website!Mine is between 0 and 180º
 Travel_Word_Problems/401608: how long does it take an object weighing 36 grams traveling 1260 fps take to hit a target 50 feet away1 solutions Answer 284286 by Alan3354(30993)   on 2011-01-30 09:47:15 (Show Source): You can put this solution on YOUR website!d = rt 50 = 1260*t t = 50/1260 t =~ 0.03968 seconds t =~ 40 milliseconds --------------------- The weight is not relevant.
 Linear-equations/401668: Solve each system by addition. 7x-4y=-3 X+2y=3 1 solutions Answer 284283 by Alan3354(30993)   on 2011-01-30 09:41:03 (Show Source): You can put this solution on YOUR website!7x-4y=-3 X+2y=3 --------- 7x-4y=-3 2x+4y=6 Eqn 2 times 2 -------- Add 9x = 3 x = 1/3 ------- Can you finish it?
 Probability-and-statistics/401664: how many bit string of length eight either start with a 1 bit or end with the two bits 001 solutions Answer 284281 by Alan3354(30993)   on 2011-01-30 09:34:24 (Show Source): You can put this solution on YOUR website!how many bit string of length eight either start with a 1 bit or end with the two bits 00 ---------------- Starting with the 1 bit = 128 to 255 = 128 numbers Ending with 00 = 256/4 = 64 numbers Half of these 64 numbers start with 1, leaving 32. Assuming starting with 1 and ending with 00 is counted only once: 128 + 32 = 160 numbers