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Recent problems solved by 'Alan3354'

Alan3354 answered: 30973 problems
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Polynomials-and-rational-expressions/427313: simplify a. 6^2= b. 6^-2= c. (1/6)^2= d. (1/6)^-2= e. -6^2= f. (-6)^2= 1 solutions Answer 297164 by Alan3354(30993)   on 2011-03-26 09:51:58 (Show Source): You can put this solution on YOUR website! simplify a. 6^2= b. c. (1/6)^2= d. (1/6)^-2= 6^2 e. -6^2= -36 f. (-6)^2= Use a calculator for the others, if necessary.

Coordinate-system/426887: solve. p=6n-5n/14 1 solutions Answer 297163 by Alan3354(30993)   on 2011-03-26 09:50:15 (Show Source): You can put this solution on YOUR website! p=6n-5n/14 p = n/14 n = 14p

Radicals/426841: I need some help on this problem, can someone help me? sqrt of 9x+25/81 1 solutions Answer 297162 by Alan3354(30993)   on 2011-03-26 09:48:21 (Show Source): You can put this solution on YOUR website! What do you want to do? What terms are under the radical? Use parentheses.

Travel_Word_Problems/426820: A boat goes upstream 600 m, moving 30 m/min through the water. The boat travels back downstream to the starting point, this time only going 20 m/min through the water. The total time spent is 75 minutes. How fast was the current flowing? 1 solutions Answer 297159 by Alan3354(30993)   on 2011-03-26 09:26:56 (Show Source): You can put this solution on YOUR website! A boat goes upstream 600 m, moving 30 m/min through the water. The boat travels back downstream to the starting point, this time only going 20 m/min through the water. The total time spent is 75 minutes. How fast was the current flowing? --------------- b = boat's speed relative to the water c = current ------------- Upstream + downstream = 75 mins 600/(30 - c) + 600/(20 + c) = 75 One equation and one variable (c-20)*(c+10) = 0 c = 20 m/min

Quadratic_Equations/427178: The motion of an autombile acceleration away from traffic light is represented by the funcitond(t) = 9t^2, where t is the time in seconds and d(t) is the distanct covered by the automobile. Approximately how many seconds does it take for the automobile to travel 180 feet? 1 solutions Answer 297156 by Alan3354(30993)   on 2011-03-26 08:47:44 (Show Source): You can put this solution on YOUR website! The motion of an autombile acceleration away from traffic light is represented by the funciton d(t) = 9t^2, where t is the time in seconds and d(t) is the distanct covered by the automobile. Approximately how many seconds does it take for the automobile to travel 180 feet? ------------ d(t) = 9t^2 = 180 t^2 = 20 t =~ 4.472 seconds

Coordinate-system/427180: given the linear equation y=-4/7x-5 find the y- coordinates of the points (-7,),(0,), and (7,) plot those points and graph the linear equation 1 solutions Answer 297153 by Alan3354(30993)   on 2011-03-26 08:41:09 (Show Source): You can put this solution on YOUR website! given the linear equation y=-4/7x-5 find the y- coordinates of the points (-7,),(0,), and (7,) plot those points and graph the linear equation ------------ Sub the values for x and find y. I think you mean y = -(4/7)x - 5 @ x = -7, y = -4 - 5 = -9 @ x = 0, y = -5 Do the same for x = 7 ----------------- Get the FREE graph software at http://www.padowan.dk

Pythagorean-theorem/427243: If a rectangular TV screen is 45 cm long and and 32 cm wide, what is the diagonal measurement of the screen? I tried 45^2 + 32^2 = X^2, but i am not sure this is the correct answer. 2025 + 1024 = X^2 sqrt ( 3049 ) = x x = 55.22 cm long? 1 solutions Answer 297146 by Alan3354(30993)   on 2011-03-26 07:59:08 (Show Source): You can put this solution on YOUR website! That's correct.

Complex_Numbers/427286: what is the answer to the question (-2 - 4i)(8 - 3i) 1 solutions Answer 297145 by Alan3354(30993)   on 2011-03-26 07:57:12 (Show Source): You can put this solution on YOUR website! What is your question? (-2 - 4i)(8 - 3i) is not a question. ---------------------- If you want to multiply those, = -2(8 - 3i) - 4i(8 - 3i) same as always = = = -28 - 26i

Radicals/427242: I am in a bit of a pickle and could sure use some help on this radical problem: 3( `sqrt(7)` + `sqrt(6)` ) + 2 ( `sqrt(6)` + `sqrt(7)` ) Can someone help? 1 solutions Answer 297126 by Alan3354(30993)   on 2011-03-26 02:15:27 (Show Source): You can put this solution on YOUR website! I don't know what those marks mean. 3( `sqrt(7)` + `sqrt(6)` ) + 2 ( `sqrt(6)` + `sqrt(7)` ) =

Polynomials-and-rational-expressions/427269: Hi I really need help with this math problem-----> find all numbers for which the rational expression is undefined 8/v-2 1 solutions Answer 297125 by Alan3354(30993)   on 2011-03-26 02:12:52 (Show Source): You can put this solution on YOUR website! 2. It makes the denominator zero.

Radicals/427219: I am trying to get an answer to this one: sqrt(5)xsqrt(35)= 1 solutions Answer 297090 by Alan3354(30993)   on 2011-03-25 21:08:16 (Show Source): You can put this solution on YOUR website! sqrt(5)*sqrt(35) Use the asterisk for multiply, x is often used for other things. ---------- =

Linear_Equations_And_Systems_Word_Problems/427218: Each of 2 brothers can wash a car in 1 hr.However their sister can wash the car in 45 mins., if all 3 works together how long will it take to wash the car? 1 solutions Answer 297089 by Alan3354(30993)   on 2011-03-25 21:04:23 (Show Source): You can put this solution on YOUR website! Use minutes for all 3 1 car in 60 mins --? 1/60 car/minute With all three, they do 1/60 + 1/60 + 1/45 car/min = (3+3+4)/180 car/min = 1/18 car per minute --> 18 minutes per car ---------------------- You can use a shortcut The 2 brothers together take 30 minutes, since they both do 1/60 per minute Use 30 & 45 and the product/sum = (30*45)/(30 + 45) = 1350/75 = 18 minutes

Money_Word_Problems/427214: Find the derivative of the function. HINT [See Quick Examples on page 835.] f(x) = (6x2 − x)ln x f '(x) = 1 solutions Answer 297088 by Alan3354(30993)   on 2011-03-25 21:01:04 (Show Source): You can put this solution on YOUR website! Do you mean f(x) = (6x^2 - x)*ln(x) ? --------- f' = (12x - 1)ln(x) + (1/x)*(6x^2 - x) = (12x - 1)ln(x) + 6x - 1

test/427206: have a problem and of course it's like always one number holding me up. It's a long problem but I'm going to send an example then what my problem is if you could tell me where that number is coming from. Example problem is k=Wd^2=(189)(4000)^2=3.024x10^9 step 2 =3.024x10^9/(4550)2 step 3 =146.1. I'm not sure where the 3.024 is coming from. My problem now is k=wd^2=(181)(4000)^2=????x10^9 I'm stuck please help. 1 solutions Answer 297085 by Alan3354(30993)   on 2011-03-25 20:53:25 (Show Source): You can put this solution on YOUR website! 189*16 = 3024 --------------- k=Wd^2=(189)(4000)^2 = 3.024x10^9 step 2 =3.024x10^9/(4550)2 step 3 =146.1 I don't know where you got the 4550, or what (4550)2 means. I don't know what you're trying to do here. ---------------- = 181*16E6 = 2896E6 = 2.896E9 = ------------------ k=Wd^2=(189)(4000)^2 = 189*(4E3)^2 = 189*16E6 = 3024E6 = 3.024E9 or

Rational-functions/427157: 8-sqrt(8+12)=3 may u please help me with this question 1 solutions Answer 297056 by Alan3354(30993)   on 2011-03-25 18:02:37 (Show Source): You can put this solution on YOUR website! They're not equal. Help do what? 8-sqrt(8+12)=3 is not a question.

Miscellaneous_Word_Problems/427164: Flor wants to solve the equation (.6)x=16. what step should she takes first? f. subtract .6 from each side. g. subtract 16 from each side. h. multiply both sides by 5 i. divide each side by 16 1 solutions Answer 297055 by Alan3354(30993)   on 2011-03-25 18:00:52 (Show Source): You can put this solution on YOUR website! Divide both sides by 0.6 ------------

Graphs/427133: Graph the conic: (x-1)^2 over 9 - (y+2)^2 over 16 = 1 1 solutions Answer 297040 by Alan3354(30993)   on 2011-03-25 16:26:36 (Show Source): You can put this solution on YOUR website! dl the FREE graph software from http://www.padowan.dk

Polynomials-and-rational-expressions/427137: how do I simplify and rewrite without using negative or zero exponents a^4.a^4= 1 solutions Answer 297039 by Alan3354(30993)   on 2011-03-25 16:25:50 (Show Source): You can put this solution on YOUR website! = a^8

Polynomials-and-rational-expressions/427139: how do I simplify and rewrite without using negative or zero exponents m^7/m^3= 1 solutions Answer 297038 by Alan3354(30993)   on 2011-03-25 16:24:48 (Show Source): You can put this solution on YOUR website! = m^4

Polynomials-and-rational-expressions/427105: how do you express 96 as the product of only prime numbers? 1 solutions Answer 297027 by Alan3354(30993)   on 2011-03-25 15:20:09 (Show Source): You can put this solution on YOUR website! = 2*2*2*2*2*3

Inequalities/427092: Which of the following are solutions to the inequality 3x - 4y < 15? a. ( -4, -9) b. ( 3, -4) c. ( 6, 2) d. ( 7, 1) I answered c. (6,2) can anyone tell me if this is correct? Thank you! 1 solutions Answer 297025 by Alan3354(30993)   on 2011-03-25 15:10:29 (Show Source): You can put this solution on YOUR website! If you sub 6 for x and 2 for y, it is less than 15, so it's correct.

Radicals/427100: April shoots an arrow upward into the air at a speed of 64 ft per second from a platform that is 34 feet high. The height of the arrow is given by the function h(t)=-16t^2+64t+34, where t is the time in seconds. What is the maximum height of the arrow? 1 solutions Answer 297024 by Alan3354(30993)   on 2011-03-25 15:06:48 (Show Source): You can put this solution on YOUR website! April shoots an arrow upward into the air at a speed of 64 ft per second from a platform that is 34 feet high. The height of the arrow is given by the function h(t)=-16t^2+64t+34, where t is the time in seconds. What is the maximum height of the arrow? ------------- The max is the vertex of the parabola, on the line of symmetry t = -b/2a t = -64/-32 = 2 seconds h(2) = -16*4 + 64*2 + 34 h(2) = 98 feet, the max ht

Functions/427087: if x=5,what is the value of 18x+23 1 solutions Answer 297020 by Alan3354(30993)   on 2011-03-25 14:51:08 (Show Source): You can put this solution on YOUR website! 113

Polynomials-and-rational-expressions/427091: If you foil ( x - 2) ( 5x + 2) and foil (3x + 5)(x - 2) + (2x - 3)(x - 2) then combine like term would you get the same solution? 1 solutions Answer 297018 by Alan3354(30993)   on 2011-03-25 14:45:21 (Show Source): You can put this solution on YOUR website! Yes

Polynomials-and-rational-expressions/427060: I am to solve and rewrite in a scientific notation please explain how to do this (2.3x10^4)(7x10^20)= 1 solutions Answer 297014 by Alan3354(30993)   on 2011-03-25 14:19:46 (Show Source): You can put this solution on YOUR website! (2.3x10^4)(7x10^20) Multiply 2.3*7 = 16.1 Multiply 10^4 * 10^20 = 10^24 --> 16.1*10^24 Move the decimal from 16.1 to 1.61 and add one to the exponent --> 1.61*10^25

Radicals/427080: Simplify: square root of 3x divided by sq.root 15x^3. My solution is (3)(1)(x)/(5)(3)(x^2)(x)= 1/x sq. root 5 but I don't think this is right. 1 solutions Answer 297010 by Alan3354(30993)   on 2011-03-25 14:06:48 (Show Source): You can put this solution on YOUR website! = = = your answer take the radical out of the denominator =

Rectangles/427041: How does a 4th grader find the dimensions of a rectangle when the perimeter is 58 and the area is 54. 1 solutions Answer 297000 by Alan3354(30993)   on 2011-03-25 12:01:13 (Show Source): You can put this solution on YOUR website! How does a 4th grader find the dimensions of a rectangle when the perimeter is 58 and the area is 54. --------------- Perimeter = 2L + 2W = 58 --> L + W = 29 Area = L*W = 54 ------------------ L = 54/W (54/W) + W = 29 54 + W^2 = 29W (W - 2)*(W - 27) = 0 W = 2 L = 27 ----------- I'm not sure that'll work in the 4th grade, it's been awhile since I was there. ---------------------- Try this: Factor 54 and look for a pair that adds to 29 54 = 1 x 54 2 x 27 3 x 18 6 x 9 Only 2 by 27 fits. If the solution is not integers, that won't work.

Coordinate-system/427044: (-7,4) 7x=6y+5 My answer was 6y=24+5=29 that is wrong why? 1 solutions Answer 296999 by Alan3354(30993)   on 2011-03-25 11:53:00 (Show Source): You can put this solution on YOUR website! (-7,4) 7x=6y+5 My answer was 6y=24+5=29 that is wrong why? -------- Your answer doesn't have an x term? ----------- You didn't say what the problem is, either, just gave a point and an equation.

logarithm/427043: what is 5^3=125 in logarithmic form? 1 solutions Answer 296998 by Alan3354(30993)   on 2011-03-25 11:49:58 (Show Source): You can put this solution on YOUR website! ----------- The log is the exponent, remember that.

Travel_Word_Problems/427046: Hello, My question is: "The H.M.S. Dreadnaught is 10 miles north of Montauk and steaming due north at 15 miles/hour, while the U.S.S. Mona Lisa is 70 miles east of Montauk and steaming due east at an even 40 miles/hour. How fast is their distance apart increasing?" I know that will be the sum of miles that they are (10*15) + (70*40) = 2950 But, I don't the rest. I think it will be divided by something, but I don't know what. I'm stuck on that question. Can you please help me on that? Thanks, Cristian 1 solutions Answer 296997 by Alan3354(30993)   on 2011-03-25 11:47:15 (Show Source): You can put this solution on YOUR website! "The H.M.S. Dreadnaught is 10 miles north of Montauk and steaming due north at 15 miles/hour, while the U.S.S. Mona Lisa is 70 miles east of Montauk and steaming due east at an even 40 miles/hour. How fast is their distance apart increasing?" -------------- I know that will be the sum of miles that they are (10*15) + (70*40) = 2950 If you include units, you'll see a problem with that 10 miles * 15 miles/hour = 150 sq miles/hr ?? Not good. ----------------------- Their directions are 90º apart, so it's a right triangle. r = sqrt(1825) =~ 42.72 mph r = the speed of one relative to the other. ---------------- The distances have no effect on the relative speed.

Rectangles/427025: A rectangular sheet of aluminum foil is 50cm long and20cm wide, and weighs 5.4 grams. Find the thickness of the aluminum foil in cm. 1 solutions Answer 296993 by Alan3354(30993)   on 2011-03-25 10:37:19 (Show Source): You can put this solution on YOUR website! A rectangular sheet of aluminum foil is 50cm long and20cm wide, and weighs 5.4 grams. Find the thickness of the aluminum foil in cm. ---------------- Its volume = 50*20*t (t = thickness) Using 2.7 gm/cc for the density of Al, 5.4 = 1000t*2.7 t = 5.4/2.700E3 cm t = 2E-3 cm or 0.002 cm = 0.02 mm = 20 microns