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# Recent problems solved by 'Alan3354'

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 Probability-and-statistics/633115: If two cards are drawn from a pack, what is the probaility that: They are of the same suit1 solutions Answer 398668 by Alan3354(30993)   on 2012-07-30 09:15:27 (Show Source): You can put this solution on YOUR website!If two cards are drawn from a pack, what is the probaility that: They are of the same suit ----------------- After the 1st card is drawn, there are 12 of that suit out of 51 cards 12/51 = 4/17
 Distributive-associative-commutative-properties/632940: What is -mp-mp ?1 solutions Answer 398592 by Alan3354(30993)   on 2012-07-29 20:47:39 (Show Source): You can put this solution on YOUR website!What is -mp-mp ? = -2mp
 test/632951: the sum of N and its next consecutive is 47, what is N? The next consecutive of N is N+______ _____=______ N=________ 1 solutions Answer 398589 by Alan3354(30993)   on 2012-07-29 20:45:01 (Show Source): You can put this solution on YOUR website!Do it like this: --------------------- The sum of N and its next consecutive is 65, what is N? --------- 65/2 = 32.5 --> 32 & 33
 test/632952: The sum of N and its next consecutive is 65, what is N? The next consecutive of N is_______ __________=___________ N=__________1 solutions Answer 398588 by Alan3354(30993)   on 2012-07-29 20:44:23 (Show Source): You can put this solution on YOUR website!The sum of N and its next consecutive is 65, what is N? --------- 65/2 = 32.5 --> 32 & 33
 Trigonometry-basics/632972: (tan^2 x - cot^2 x) / tan x + cot x = tan x - cot x, verify. 1 solutions Answer 398581 by Alan3354(30993)   on 2012-07-29 20:01:04 (Show Source): You can put this solution on YOUR website!(tan^2 x - cot^2 x) / tan x + cot x = tan x - cot x, verify. ----------- Multiply by (tan + cot)
 Circles/632968: A triangle with sides 3,4,5 is inscribed in a circle. What is the area of the circle?1 solutions Answer 398562 by Alan3354(30993)   on 2012-07-29 18:48:49 (Show Source): You can put this solution on YOUR website!A triangle with sides 3,4,5 is inscribed in a circle. What is the area of the circle? -------- 3, 4, 5 is a right triangle. The diameter of a circle with an inscribed right triangle is the hypotenuse of the triangle. --> r = 2.5 You can find the area with that.
 Polynomials-and-rational-expressions/632971: what is the GCF of 8x^2+20x1 solutions Answer 398561 by Alan3354(30993)   on 2012-07-29 18:46:51 (Show Source): You can put this solution on YOUR website!what is the GCF of 8x^2+20x ------------- GCF is Greatest Common Factor. you have only 1 binomial. Usually "common" refers to what is contained in more than one expression. The GCF of one expression is itself.
 Quadratic-relations-and-conic-sections/632970: WHAT IS THE (H,K) OF THIS EQUATION. X^2+16X=8Y-16, I need to find the graph of the parabola.1 solutions Answer 398560 by Alan3354(30993)   on 2012-07-29 18:44:40 (Show Source): You can put this solution on YOUR website!WHAT IS THE (H,K) OF THIS EQUATION. X^2+16X=8Y-16, I need to find the graph of the parabola. -------------- You can't find a graph, you have to make it. ------------- dl the FREE graph software at http://www.padowan.dk Use F6 to enter it as it is.
 Trigonometry-basics/632871: I'm trying to use the sum and differences identities to write this expression as a sine, cosine, and tangent of an angle presented in degrees. I'm trying to completely, and correctly, solve this equation: sin(140)deg cos(5)deg + cos (140)deg sin (50)deg. So far...I've come up with this solution: sin(140 + 50)= 190 degrees Because Sin(u+v)= sin(u)cos(v)+cos(u)sin(v) So...how am I supposed to solve and write the above expression as a sine, cosine, and tangent of an angle? Thanks! - Pat1 solutions Answer 398525 by Alan3354(30993)   on 2012-07-29 12:11:13 (Show Source): You can put this solution on YOUR website!One term has 5 degrees.
 Linear_Algebra/632878: 3x1-3x2+5x3=6 x1+7x2+5x3=4 5x1+10x2+15x31 solutions Answer 398524 by Alan3354(30993)   on 2012-07-29 12:03:17 (Show Source): You can put this solution on YOUR website!3x1-3x2+5x3=6 x1+7x2+5x3=4 5x1+10x2+15x3 --------- The last row has no equal sign.
 Miscellaneous_Word_Problems/632873: How long would it take light to travel a mole of millimeters? Write your answer in a form like this: 6 years, 4 months, and 13 days. Give your answer in approximate form (within a few days). I figured out that light travels at a speed of 3x10^8 m/s. I have only dealt with moles regarding the periodic elements and cannot figure out how to transfer that knowledge to this question.1 solutions Answer 398518 by Alan3354(30993)   on 2012-07-29 10:19:47 (Show Source): You can put this solution on YOUR website! How long would it take light to travel a mole of millimeters? Write your answer in a form like this: 6 years, 4 months, and 13 days. Give your answer in approximate form (within a few days). -------------- There is no mole of millimeters. If you mean the number of molecules in a mole, 6.022E23 mms = 6.022E20 meters -------- d = r*t t = d/r = 6.022E20/3E8 seconds =~ 2.007E12 seconds ------ You can change the units.
 Travel_Word_Problems/632767: A plane travels 800 miles against a storm in 4 hours. Giving up, the pilot turns around and flies back 800 miles to the airport in only 2 hours with the aid of the tailwind. Find the speed of the wind and the speed of the plane in still air.1 solutions Answer 398471 by Alan3354(30993)   on 2012-07-28 22:05:16 (Show Source): You can put this solution on YOUR website!A plane travels 800 miles against a storm in 4 hours. Giving up, the pilot turns around and flies back 800 miles to the airport in only 2 hours with the aid of the tailwind. Find the speed of the wind and the speed of the plane in still air. ------------ find the 2 groundspeeds. The plane's airspeed is the average. --------- The windspeed is the difference between groundspeed and airspeed.
 test/632762: Use the graph to determine whether each system has no solution, one solution, or infinetly many solutions.. 1. Y=x-1 Y=-x+1 2. X-y=-4 Y=x+4 3. Y=x+4 2x-2y=2 4. Y=2x-3 2x-2y=21 solutions Answer 398470 by Alan3354(30993)   on 2012-07-28 22:01:41 (Show Source): You can put this solution on YOUR website!Use the graph to determine whether each system has no solution, one solution, or infinetly many solutions.. 1. Y=x-1 Y=-x+1 ----------- These are straight lines, so you need 2 points. y = x-1 Pick 2 values for x and find y. Plot the 2 points. Draw a line thru them. ============== The intersection (if any) is the solution. Do the others the same way. ---------------------------------------- 2. X-y=-4 Y=x+4 3. Y=x+4 2x-2y=2 4. Y=2x-3 2x-2y=2
 Expressions-with-variables/632771: i NEED HELP SOLVING D=ABC FOR B1 solutions Answer 398469 by Alan3354(30993)   on 2012-07-28 21:59:35 (Show Source): You can put this solution on YOUR website!i NEED HELP SOLVING D=ABC FOR B --------- Divide by AC
 Expressions-with-variables/632754: how to solve 4/5x^-7?1 solutions Answer 398455 by Alan3354(30993)   on 2012-07-28 20:33:16 (Show Source): You can put this solution on YOUR website!how to solve 4/5x^-7? -------------- Not an equation, nothing to solve.
 Expressions-with-variables/632756: how to solve -16x^-51 solutions Answer 398454 by Alan3354(30993)   on 2012-07-28 20:32:38 (Show Source): You can put this solution on YOUR website!how to solve -16x^-5 ----------- It's not an equation, nothing to solve.
 Miscellaneous_Word_Problems/632746: `Problem: One day I was at school,the electricity went out at home. when I left for swim practice that morning,all the clocks were working and the time was 6:30am.When I returned home they all said different times. the wind -up clock,which was unaffected by the loss of electricity,have a time of 5:21pm. my math clock, which stops when the electricity is off and runs when the electricity is on, gave a time of 3:50 pm. My digital clock, which resets to midnight when the power goes off and continues to run from that point,have a flashing time of 6:03 am. Assuming the electricity went out only once, what time did it go out and for how long? ~ also can you show all of your work thank you soo much1 solutions Answer 398453 by Alan3354(30993)   on 2012-07-28 20:31:34 (Show Source): You can put this solution on YOUR website!dup
 Miscellaneous_Word_Problems/632744: Problem: One day I was at school,the electricity went out at home. when I left for swim practice that morning,all the clocks were working and the time was 6:30am.When I returned home they all said different times. the wind -up clock,which was unaffected by the loss of electricity,have a time of 5:21pm. my math clock, which stops when the electricity is off and runs when the electricity is on, gave a time of 3:50 pm. My digital clock, which resets to midnight when the power goes off and continues to run from that point,have a flashing time of 6:03 am. Assuming the electricity went out only once, what time did it go out and for how long? ~ also can you show all of your work thank you soo much!1 solutions Answer 398452 by Alan3354(30993)   on 2012-07-28 20:31:14 (Show Source): You can put this solution on YOUR website!dup
 Miscellaneous_Word_Problems/632747: `Problem: One day I was at school,the electricity went out at home. when I left for swim practice that morning,all the clocks were working and the time was 6:30am.When I returned home they all said different times. the wind -up clock,which was unaffected by the loss of electricity,have a time of 5:21pm. my math clock, which stops when the electricity is off and runs when the electricity is on, gave a time of 3:50 pm. My digital clock, which resets to midnight when the power goes off and continues to run from that point,have a flashing time of 6:03 am. Assuming the electricity went out only once, what time did it go out and for how long? ~ also can you show all of your work thank you soo muchh1 solutions Answer 398451 by Alan3354(30993)   on 2012-07-28 20:30:49 (Show Source): You can put this solution on YOUR website!One day I was at school,the electricity went out at home. when I left for swim practice that morning,all the clocks were working and the time was 6:30am.When I returned home they all said different times. the wind -up clock,which was unaffected by the loss of electricity,have a time of 5:21pm. my math clock, which stops when the electricity is off and runs when the electricity is on, gave a time of 3:50 pm. My digital clock, which resets to midnight when the power goes off and continues to run from that point,have a flashing time of 6:03 am. Assuming the electricity went out only once, what time did it go out and for how long? ------------------------------ the wind -up clock,which was unaffected by the loss of electricity,have a time of 5:21pm. my math clock, which stops when the electricity is off and runs when the electricity is on, gave a time of 3:50 pm. ---- The difference from 350 to 521 = 1hr 31 minutes, the time the power was off. --------- My digital clock, which resets to midnight when the power goes off and continues to run from that point,have a flashing time of 6:03 am. Assuming the electricity went out only once, what time did it go out ---- The digital clock ran for 6hr 3 minutes since power was restored. ---- 1721 - 603 = 1118, the time the power was restored. 1118 - 131 = 0947, the time the power went off
 Graphs/632724: I'm suppose to solve the system of equation by using the addition method: x-y =-9 x+3 = 15 I know the answer is (-3,6) but I dont know HOW they got the answer.1 solutions Answer 398437 by Alan3354(30993)   on 2012-07-28 17:27:27 (Show Source): You can put this solution on YOUR website!x-y =-9 x+3 = 15 ==================== I think you mean x- y =-9 x+3y = 15 -------------- Subtract -4y = -24 y = 6 ------ Sub for y in either eqn, find x
 Square-cubic-other-roots/632674: cube root of 9.81 solutions Answer 398428 by Alan3354(30993)   on 2012-07-28 16:04:48 (Show Source): You can put this solution on YOUR website!cube root of 9.8 ---------------- Use a calculator.
 Quadratic_Equations/632712: Without solving the equation (or factoring) determine the solution to the equation x^-6x=0 by using only the graph. Can you help me? Thanks Does it have a maximum or minimum What are the coordinates of the vertex in (x,y) form What is the equation of the axis of symmetry for this parabola1 solutions Answer 398426 by Alan3354(30993)   on 2012-07-28 16:01:18 (Show Source): You can put this solution on YOUR website!x^-6x=0 -------------- Is the exponent -6x ?
 Polygons/632623: four exterior angles of a polygon are 80 degrees each. if the remaining angles are 20 degrees, how many sides has the polygon?1 solutions Answer 398406 by Alan3354(30993)   on 2012-07-28 13:35:47 (Show Source): You can put this solution on YOUR website!four exterior angles of a polygon are 80 degrees each. if the remaining angles are 20 degrees, how many sides has the polygon? ----------------- Hint: The total is always 360 degs 4*80 = 320
 test/632624: How to solve k=m/v equations1 solutions Answer 398405 by Alan3354(30993)   on 2012-07-28 13:32:58 (Show Source): You can put this solution on YOUR website!How to solve k=m/v equations ------------------ The same as any equation.
 Pythagorean-theorem/632678: Given a right triangle, use the Pythagorean theorem to find "a" (one of the legs) when c = 40 and b = 20. Use a calculator and round your answer to the nearest tenth1 solutions Answer 398404 by Alan3354(30993)   on 2012-07-28 13:30:08 (Show Source): You can put this solution on YOUR website!Given a right triangle, use the Pythagorean theorem to find "a" (one of the legs) when c = 40 and b = 20. Use a calculator and round your answer to the nearest tenth --------------------
 Length-and-distance/632581: CD is a water pipeline. A(2,3) and B(5,4) are two towns. A pumping station is to be located on the pipeline to pump water to A and B. Each town is to pay for their own service pipes and insist on equality of costs. What is the total length of the service pipe required?1 solutions Answer 398370 by Alan3354(30993)   on 2012-07-28 09:37:52 (Show Source): You can put this solution on YOUR website!A(2,3) and B(5,4) are two towns --------- d =~ 3.162 units ============= No cost info is given
 Exponents/632595: (-6.2) to the 9th power times (-6.2) to the 12th power. How do you solve this equation?1 solutions Answer 398369 by Alan3354(30993)   on 2012-07-28 09:34:30 (Show Source): You can put this solution on YOUR website!(-6.2) to the 9th power times (-6.2) to the 12th power. How do you solve this equation? ============= There's no equal sign, so it's not an equation. --> nothing to solve for.
 Trigonometry-basics/632576: what are the roots of x when cot(x)-square root 3/3 1 solutions Answer 398366 by Alan3354(30993)   on 2012-07-28 08:21:34 (Show Source): You can put this solution on YOUR website!what are the roots of x when cot(x)-square root 3/3 ----------- What?
 Exponents/632594: x to the 5th power times x to the 12th power. How do you solve this eqation?1 solutions Answer 398365 by Alan3354(30993)   on 2012-07-28 08:20:25 (Show Source): You can put this solution on YOUR website!x to the 5th power times x to the 12th power. How do you solve this eqation? =============== It's not an equation, there's no equal sign. --> nothing to be solved. ------- =
 Graphs/632499: -3x+y=-3 x-y=31 solutions Answer 398333 by Alan3354(30993)   on 2012-07-27 20:06:27 (Show Source): You can put this solution on YOUR website!-3x+ y=-3 +x - y =3 ------------ Add
 Equations/632498: Write an equation for a line that is parallel to the x-axis. What would be the y-intercept and x-intercept for the line of the equation above?1 solutions Answer 398332 by Alan3354(30993)   on 2012-07-27 19:26:58 (Show Source): You can put this solution on YOUR website!Write an equation for a line that is parallel to the x-axis. ------------ y = k, k = any number --------------- What would be the y-intercept and x-intercept for the line of the equation above? The y-int is (0,k). There is no x-int, it's parallel to the x-axis. Parallel lines don't intersect.