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Alan3354 answered: 30973 problems
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Expressions-with-variables/268003: 8x+4y=12;y 1 solutions Answer 196522 by Alan3354(30993)   on 2010-02-10 10:24:37 (Show Source): You can put this solution on YOUR website! Do you have a question?

Surface-area/268023: how to determine the area of a rectangle which has a side that measures 20 ft? 1 solutions Answer 196516 by Alan3354(30993)   on 2010-02-10 10:05:00 (Show Source): You can put this solution on YOUR website! Area = product of 2 adjacent sides, or Length x Width

test/268014: Examine the following unbalanced chemical equation: CO2 + C → CO. Which of the following is the correctly balanced form of this equation? A. 2CO2 + C → CO B. CO2 + C → 2CO C. CO2 + C2 → CO D. CO2 + C → C2O 1 solutions Answer 196512 by Alan3354(30993)   on 2010-02-10 09:50:21 (Show Source): You can put this solution on YOUR website! Count the C and O on both sides. Only one has an equal number.

test/268015: One atom of silicon can properly be combined in a compound with A. one atom of chlorine. B. two atoms of oxygen. C. three atoms of hydrogen. D. four atoms of calcium. 1 solutions Answer 196508 by Alan3354(30993)   on 2010-02-10 09:49:19 (Show Source): You can put this solution on YOUR website! B

test/268017: In a nuclear reaction, energy is released by the combination of two elements into a new element. This process is an example of A. natural radioactivity. B. artificial disintegration. C. nuclear fusion. D. nuclear fission. 1 solutions Answer 196505 by Alan3354(30993)   on 2010-02-10 09:44:35 (Show Source): You can put this solution on YOUR website! C

Radicals/268008: I am stuck on thise problem, I tried to do it but not sure I did it right. Please help!! (2 sqrt y)^3 1 solutions Answer 196504 by Alan3354(30993)   on 2010-02-10 09:42:59 (Show Source): You can put this solution on YOUR website! (2 sqrt y)^3 = (2 sqrt y)^2 * (2 sqrt y) = 4y*(2 sqrt y) =

test/267998: Which of the following is represented in the highest percentage by volume in dry air? A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen 1 solutions Answer 196498 by Alan3354(30993)   on 2010-02-10 08:42:40 (Show Source): You can put this solution on YOUR website! B

Linear-equations/267973: Write an equation of the line that passes through the point and has the given slope.Write the equation in slope-intercept form. 1 solutions Answer 196495 by Alan3354(30993)   on 2010-02-10 08:16:14 (Show Source): You can put this solution on YOUR website! You didn't give any data, but here's an example: or 2 Given 2 points example. Find the equation of the line thru the points (2,1) and (3,5) --------------------- This is a 2 step process. First find the slope of the line thru the points. slope, m = diffy/diffx m = (5-1)/(3-2) m = 4 --------- Now use y = mx + b with either point to find b, the y-intercept. y = mx + b 5 = 4*3 + b b = -7 ------- y = mx + b y = 4x - 7 is the answer. ------------------------ For further assistance, or to check your work, email me via the thank you note. ---------------------- A line and a point example. Write in standard form the eqation of a line that satisfies the given conditions. Perpendicular to 9x+3y=36, through (1,2) ----------------- Find the slope of the line. Do that by putting the equation in slope-intercept form, y = mx + b. That means solve for y. 9x+3y = 36 3y= - 9x + 36 y = -3x + 13 The slope, m = -3 ------------------ The slope of lines parallel have the same slope. The slope of lines perpendicular is the negative inverse, m = +1/3 ---------------- Use y = mx + b and the point (1,2) to find b. 2 = (1/3)*1 + b b = 5/3 The equation is y = (1/3)x + 5/3 (slope-intercept form) x - 3y = -5 (standard form) ------------------------ For further assistance, or to check your work, email me via the thank you note.

Expressions-with-variables/267862: How do I write a slope intercept form of the equation of a line? 1 solutions Answer 196470 by Alan3354(30993)   on 2010-02-09 21:30:42 (Show Source): You can put this solution on YOUR website! Whatever you're given, solve for y. y = mx + b m is slope b is y-intercept

Quadratic_Equations/267876: how do you get the quotient for -9/i in the form a + bi and how do you get the quotient for 9+3i _____ 4 -8i 1 solutions Answer 196469 by Alan3354(30993)   on 2010-02-09 21:28:57 (Show Source): You can put this solution on YOUR website! how do you get the quotient for -9/i in the form a + bi Multiply NUM and DEN by i = -9i/i^2 = 9i It is in a + bi form, a = 0 -------------------------- how do you get the quotient for 9+3i _____ 4 -8i ------------ Multiply NUM and DEN by the conjugate of the DEN 4+8i = (9+3i)*(4+8i)/(16+64) = (12 + 84i)/80 = (3+21i)/20 or (3/20)*(1+7i)

Graphs/267875: is (2,2) a soultion? 1 solutions Answer 196465 by Alan3354(30993)   on 2010-02-09 21:17:45 (Show Source): You can put this solution on YOUR website! It is for some things, not for others.

Geometry_Word_Problems/267082: For a convex 40-gon, what is the sum of the measures of the interior angles? 1 solutions Answer 196464 by Alan3354(30993)   on 2010-02-09 21:17:11 (Show Source): You can put this solution on YOUR website! 38*180 degrees

Miscellaneous_Word_Problems/267852: Ariana and her father build a 0.08 scale model of her grandmother's cottage in Greece as a present for her mother. If the the scale model has a square footage of 7.68 square feet and if one side is 3.2 feet long, what is the square footage of her grandmother's cottage? So far I think I got the other length, 2.4 ft. But would I do after that? 1 solutions Answer 196459 by Alan3354(30993)   on 2010-02-09 20:46:10 (Show Source): You can put this solution on YOUR website! Ariana and her father build a 0.08 scale model of her grandmother's cottage in Greece as a present for her mother. If the the scale model has a square footage of 7.68 square feet and if one side is 3.2 feet long, what is the square footage of her grandmother's cottage? So far I think I got the other length, 2.4 ft. But would I do after that? ----------------------- It is 3.2 by 2.4 at 0.08 scale. Both dimensions are 0.08 times the actual s1*0.08 = 3.2 s1 = 3.2/0.08 = 40 feet s1 = 2.4/0.08 = 30 feet Area = 40*30 = 1200 square feet

Numbers_Word_Problems/267831: Mrs. Donegan opened a book so the sum of the page numbers on the facing pages was 33. Show the pages of her open book...What are the consecutive page numbers? 1 solutions Answer 196458 by Alan3354(30993)   on 2010-02-09 20:41:51 (Show Source): You can put this solution on YOUR website! 33/2 = 16.5 --> 16 and 17

Graphs/267851: please help me solve this problem find the point that is one-fourth of the distance from the point P(-1,3) to the point Q(7,5) along the segment PQ. 1 solutions Answer 196457 by Alan3354(30993)   on 2010-02-09 20:40:38 (Show Source): You can put this solution on YOUR website! find the point that is one-fourth of the distance from the point P(-1,3) to the point Q(7,5) along the segment PQ. --------------- Do the x and y separately. The x distance from P to Q = 8 The y distance = 2 1/4 of x = 2 1/4 of y = 1/2 Add to P: --> (1,3.5)

Exponents/267787: Write in Scientific Notation. Show simplification. (3x10^-2)(2x10^3)/all under 12x10^-4 1 solutions Answer 196451 by Alan3354(30993)   on 2010-02-09 20:10:46 (Show Source): You can put this solution on YOUR website! (3x10^-2)(2x10^3)/all under 12x10^-4 under? -------------- = 12E-4/(3E-2 * 2E3) = 12E-4/6E1 = 2E-5 or 2*10^-5 if you prefer inconvenient

Trigonometry-basics/267832: in triangle ABC if A=54.3degrees B=63.8 degree and b=12.2 find a 1 solutions Answer 196449 by Alan3354(30993)   on 2010-02-09 20:07:45 (Show Source): You can put this solution on YOUR website! Use the Law of Sines: a/sin(A) = b/sin(B) a = b*sin(A)/sin(B) a = 12.2*sin(54.3)/sin(63.8) You can do the math

logarithm/267826: (The 25 is supposed to be small and on the bottom but I couldn't figure out how) I am not sure what to do now... 1 solutions Answer 196443 by Alan3354(30993)   on 2010-02-09 19:51:51 (Show Source): You can put this solution on YOUR website! w = 1/2 You had it solved, just didn't write down the last step. I am not sure what to do now...

Triangles/267761: Find the range for the measure of the third side of a triangle given the measures of two sides. 5 and 9 1 solutions Answer 196442 by Alan3354(30993)   on 2010-02-09 19:48:01 (Show Source): You can put this solution on YOUR website! It has to be more than 4 (9-5) and less than 14 (9+5) 14>s>4

Geometry_Word_Problems/267778: the length of a rectangular rug is 3 ft. If the areais 15 ft squared, what is the perimeter of the rug? 1 solutions Answer 196439 by Alan3354(30993)   on 2010-02-09 19:43:41 (Show Source): You can put this solution on YOUR website! Area = Length * Width find the Width ------------------- Perimeter = 2L + 2W

Polynomials-and-rational-expressions/267811: Multiply. (5^2+10)(2^2+2) 1 solutions Answer 196438 by Alan3354(30993)   on 2010-02-09 19:41:59 (Show Source): You can put this solution on YOUR website! Give it a try. email via the TY note to check your work.

Travel_Word_Problems/267809: A car travels 45 km with an average speed of 10 m/s. How many seconds takes to complete the travel? 1 solutions Answer 196437 by Alan3354(30993)   on 2010-02-09 19:41:18 (Show Source): You can put this solution on YOUR website! 45 km = 45000 meters You have 2 numbers to work with. ----------------- email via the TY note to check your work.

Travel_Word_Problems/267813: The sound travels in an average speed of 340m/s the lightning that comes from a cloud caused by a storm, is obseved almost inmediately. If th sound of lightning comes to our ears about 1.3 minutes after. How far is the storm? 1 solutions Answer 196436 by Alan3354(30993)   on 2010-02-09 19:39:56 (Show Source): You can put this solution on YOUR website! 1.3 minutes = 78 seconds ------------------------------- That gives you 340 m/sec and 78 seconds. Take it from there.

Triangles/267800: find the area of a triangle 15cm x 10 cm 1 solutions Answer 196431 by Alan3354(30993)   on 2010-02-09 19:25:41 (Show Source): You can put this solution on YOUR website! Are those 2 sides? Which sides?

Linear-equations/267781: I'm having trouble solving: 3xsquared times 6x = 2xsquared - 8 could you help? 1 solutions Answer 196414 by Alan3354(30993)   on 2010-02-09 18:59:33 (Show Source): You can put this solution on YOUR website! 3xsquared times 6x = 2xsquared - 8 ---------------- x = -0.727845 (by graphical methods)

Quadratic_Equations/267713: 3x+y=16 y=16-3x x(16-3x)=16x-3x^2 x^2 +(16x-3x^2)= x^2+16x+9x^2 10x^2 +256 I get 10x^2-144x+256........the answer is 10x^2-96x+256 How do they get -96x?? This is a minimization/maximization of quadratic functions problem Thanks for any/all help! 1 solutions Answer 196391 by Alan3354(30993)   on 2010-02-09 17:29:43 (Show Source): You can put this solution on YOUR website! 3x+y=16 y=16-3x ---------- Are these the 2 equations? It's the same one twice. There's no point in working further. --> dependent, infinite # of solutions. ------------------ x(16-3x)=16x-3x^2 ?? Where did this come from? x^2 +(16x-3x^2)= x^2+16x+9x^2 10x^2 +256 I get 10x^2-144x+256........the answer is 10x^2-96x+256 How do they get -96x?? ------------------- Restate the problem, if it's different than that above.

logarithm/267661: Solve the equation log x + log15 = log 90 1 solutions Answer 196374 by Alan3354(30993)   on 2010-02-09 15:50:38 (Show Source): You can put this solution on YOUR website! log x + log15 = log 90 log(x) = log(90) - log(15) = log(90/15) = log(6) x = 6

Quadratic_Equations/267628: How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are only given the solution? Is it possible to have different quadratic equations with the same solution? Explain. Provide your classmate’s with one or two solutions with which they must create a quadratic equation. 1 solutions Answer 196367 by Alan3354(30993)   on 2010-02-09 15:28:44 (Show Source): You can put this solution on YOUR website! How do you know if a quadratic equation will have one, two, or no solutions? If the discriminant is zero (0), there's one solution. Otherwise, there's 2. ------------------------- How do you find a quadratic equation if you are only given the solution? If the solutions are x = a and x = b, it's (x-a)*(x-b) = 0. In the case of one solution, it's (x-a)^2 = 0 ---------------------- Is it possible to have different quadratic equations with the same solution? Yes, it is. You can draw an infinite number of parabolas thru the same 2 points on the x-axis. ------------------------ Explain. Provide your classmate’s with one or two solutions with which they must create a quadratic equation. Look at some of the solved problems. There are examples of practical problems that are solved with quadratics. One example: The height of an object shot upward at velocity v from the level h0 is given by (h in feet, t in seconds)

test/267609: In a transverse wave that travels through a medium, the molecules of the medium vibrate A. in the direction in which the wave travels. B. at right angles to the direction in which the wave travels. C. at twice the velocity of the molecules in a longitudinal wave. D. with smaller amplitudes than the molecules in a longitudinal wave. 1 solutions Answer 196365 by Alan3354(30993)   on 2010-02-09 15:22:00 (Show Source): You can put this solution on YOUR website! B ------- Longitudinal waves vibrate the medium in the same direction as the propogation of the wave.

test/267622: A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes A. three times as low. B. nine times as low. C. three times as high. D. nine times as high. 1 solutions Answer 196362 by Alan3354(30993)   on 2010-02-09 15:17:11 (Show Source): You can put this solution on YOUR website! A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes A. three times as low. B. nine times as low. C. three times as high. D. nine times as high. ----------------- Three times farther is four (4) times as far. People who write books should learn to speak English. --------------- Assuming three times as far was intended: It would be 1/9 the intensity, which is sort of what B says. --------------------- What is "nine times as low" ?? If it's 1 times as low, how much is that? That would be zero (0). Then how can it get to be 9 times as low? See my statement above about speaking English, instead of Gibberish.

logarithm/267647: Solve each equation logX + log8 = log200 1 solutions Answer 196358 by Alan3354(30993)   on 2010-02-09 15:11:08 (Show Source): You can put this solution on YOUR website! logX + log8 = log200 log(x) = log(200)-log(8) = log(200/8) log(x) = log(25) x =~ 1.39794