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Recent problems solved by 'Alan3354'

Alan3354 answered: 30973 problems
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Travel_Word_Problems/662419: two trains are coming in the opposite direction each at a speed of 60 kmph, now a fly on one train moves towards the other with a speed of 80kmph, how much distance will it cover before it is crushed.? 1 solutions Answer 412337 by Alan3354(30993)   on 2012-10-06 16:28:46 (Show Source): You can put this solution on YOUR website! two trains are coming in the opposite direction each at a speed of 60 kmph, now a fly on one train moves towards the other with a speed of 80kmph, how much distance will it cover before it is crushed.? ---------------- How far apart are the trains?

Travel_Word_Problems/662538: jennas sixth grade class is taking a bus to the zoo. the zoo is 156 miles from the school. if the bus travels an average of 55mi/h , about how lng will it atke the class to get there 1 solutions Answer 412336 by Alan3354(30993)   on 2012-10-06 16:26:31 (Show Source): You can put this solution on YOUR website! jennas sixth grade class is taking a bus to the zoo. the zoo is 156 miles from the school. if the bus travels an average of 55mi/h , about how lng will it atke the class to get there ---------- d = r*t t = d/r

Complex_Numbers/662528: How many ways are there to make twelve without using zero 1 solutions Answer 412334 by Alan3354(30993)   on 2012-10-06 16:21:04 (Show Source): You can put this solution on YOUR website! How many ways are there to make twelve without using zero -------------- An infinite number. 1 + 11 2 + 10 etc 1/5 + 59/5 -1 + 13 -2 + 14 -899 + 911 3*4 2*6 (1/3)*36

Travel_Word_Problems/662535: A car travels 134 miles in 3 hours. Find the average speed of the car in miles per hour. Round to the nearest tenth. 1 solutions Answer 412332 by Alan3354(30993)   on 2012-10-06 16:14:56 (Show Source): You can put this solution on YOUR website! A car travels 134 miles in 3 hours. Find the average speed of the car in miles per hour. Round to the nearest tenth. -------------- d = r*t r = d/t It's the # of miles divided by the # of hours.

Trigonometry-basics/662514: I cant seem to figure this problem out. Any help would be greatly appreciated. Ok here it is - Find the smallest positive number x, so that sin(x^2+3x+1)=-1? any Ideas. Thank you for your time. 1 solutions Answer 412321 by Alan3354(30993)   on 2012-10-06 15:00:44 (Show Source): You can put this solution on YOUR website! Find the smallest positive number x, so that sin(x^2+3x+1)=-1? --------- sin(x^2+3x+1)=-1 (x^2+3x+1) = 3pi/2 or -pi/2 ------ Or, Solve for x

Linear-equations/662513: -x+3y=4 x-3y=3 what is the elimination method to solve these two problems 1 solutions Answer 412319 by Alan3354(30993)   on 2012-10-06 14:55:42 (Show Source): You can put this solution on YOUR website! -x+3y=4 x-3y=3 what is the elimination method to solve these two problems ------------- It's 2 equations, 1 problem. ============================== -x+3y=4 x -3y=3 --------- Add 0 + 0 = 7 --> inconsistent, no solution. If you graph them, you get parallel lines. No intersection, no solution.

Travel_Word_Problems/662501: Jeremiah can kayak downstream a distance of 21 kilometers in 3 hours. Going upstream, he can kayak a distance of only 24 kilometers in 4 hours. How fast could Jeremiah kayak in still water (if there were no current)? 1 solutions Answer 412318 by Alan3354(30993)   on 2012-10-06 14:50:33 (Show Source): You can put this solution on YOUR website! Jeremiah can kayak downstream a distance of 21 kilometers in 3 hours. Going upstream, he can kayak a distance of only 24 kilometers in 4 hours. How fast could Jeremiah kayak in still water (if there were no current)? ------------------------------- d'stream speed = 21/3 = 7 km/hr u'stream = 24/4 = 6 km/hr ---- His speed is the average = 6.5 km/hr

Problems-with-consecutive-odd-even-integers/662480: The product of three positive, consecutive odd integers is 15 times their sum. What are the integers? 1 solutions Answer 412317 by Alan3354(30993)   on 2012-10-06 14:47:12 (Show Source): You can put this solution on YOUR website! The product of three positive, consecutive odd integers is 15 times their sum. What are the integers? ----------------------- x = middle integer (x-2) + x + (x+2) = 3x (x-2)*x*(x+2) = 15*3x = 45x x = 0 (not an odd number) ------------- x = 7 --> 5, 7 , 9

test/662509: Solve |x - 3|= - 2 1 solutions Answer 412315 by Alan3354(30993)   on 2012-10-06 14:42:53 (Show Source): You can put this solution on YOUR website! Solve |x - 3|= - 2 ------------ The absolute value cannot be negative. No solution.

Polynomials-and-rational-expressions/662499: How do I write 243^-3/5 in a radical notation? 1 solutions Answer 412302 by Alan3354(30993)   on 2012-10-06 14:07:49 (Show Source): You can put this solution on YOUR website! 243^-3/5

test/662505: Solve this absolute value equation for x: | 7x + 6 | = 10 1 solutions Answer 412301 by Alan3354(30993)   on 2012-10-06 14:06:46 (Show Source): You can put this solution on YOUR website! | 7x + 6 | = 10 7x+6 = 10 x = 4/7 ============ -(7x+6) = 10 7x+6 = -10 x = -16/7

logarithm/662500: I am trying to solve: 3 ln x=-9 and I get .049787 Is there supposed to be 2 answers that are separated by a comma 1 solutions Answer 412299 by Alan3354(30993)   on 2012-10-06 14:05:21 (Show Source): You can put this solution on YOUR website! I am trying to solve: 3 ln x=-9 and I get .049787 ----------- 3ln(x) = -9 ln(x) = -3 x =~ 0.049787 Just one answer.

Mixture_Word_Problems/662482: How do I dilute a 50% solution to a 25% solution 1 solutions Answer 412287 by Alan3354(30993)   on 2012-10-06 12:50:29 (Show Source): You can put this solution on YOUR website! How do I dilute a 50% solution to a 25% solution --------------- 50% is 1 to 1 25% is 1 to 3 Add solvent amount = total starting amount. eg, If you have one liter of 50%, add 1 liter of solvent.

Polynomials-and-rational-expressions/662478: Iam trying to find all the zeros for x5+6x4-x3-6x2-20x-120 found -6 1 solutions Answer 412285 by Alan3354(30993)   on 2012-10-06 12:45:47 (Show Source): You can put this solution on YOUR website! x5+6x4-x3-6x2-20x-120 -------------- Divide by (x+6) --> x = =/- sqrt(5) x = +/- 2i

Numeric_Fractions/662468: What would 2/7 x 3/11 be, my email adress is des.r.lewis@gmail.com 1 solutions Answer 412272 by Alan3354(30993)   on 2012-10-06 11:26:22 (Show Source): You can put this solution on YOUR website! 2/7 x 3/11 ------- = 2*3/(7*11) = 6/77

Travel_Word_Problems/662428: Pedro can finish a table for about 3 hrs and Juan is 2 hrs if they will combine how long they can finish a table? please help me to get the right formula. 1 solutions Answer 412268 by Alan3354(30993)   on 2012-10-06 11:15:27 (Show Source): You can put this solution on YOUR website! Pedro can finish a table for about 3 hrs and Juan is 2 hrs if they will combine how long they can finish a table? P does 1/3 of the job per hour. J does 1/2 per hour. Together, they do 1/3 + 1/2 per hour = 5/6 per hour --> 6/5 hours per job --------------------- please help me to get the right formula. Knowing how to do it is important. Knowing a formula, if there is one, is not.

Expressions-with-variables/662458: x+y= 18 x*y= 56 We've figured out the values of x and y are 14 and 4, but we have stalled trying to prove our answer algebraicly, I.e. to "show our work." Can you help, please? 1 solutions Answer 412267 by Alan3354(30993)   on 2012-10-06 11:12:33 (Show Source): You can put this solution on YOUR website! x+y= 18 x*y= 56 ----------- y = 18 - x Sub for y x*(18 - x) = 56 x = 4, x = 14

Average/662418: how we find increase in average of some thing??? 1 solutions Answer 412259 by Alan3354(30993)   on 2012-10-06 11:00:17 (Show Source): You can put this solution on YOUR website! how we find increase in average of some thing??? ------------ You'll have to be more specific.

Equations/662427: what is the equation for (8,-5); 4x-3y=7 1 solutions Answer 412247 by Alan3354(30993)   on 2012-10-06 10:25:58 (Show Source): You can put this solution on YOUR website! what is the equation for (8,-5); 4x-3y=7 ------------------- What do you want to do? (8,-5) is a point. 4x-3y = 7 is an equation. ----------- You can find a line thru the point parallel to the eqn, or perpendicular to it. You can find the distance from the point to the line. You can find a circle centered at the point tangent to the line. You have to know what you want to do.

Square-cubic-other-roots/662451: Where do I become? I have no idea how to work this problem.(a+b)/(c)=(x)/(d) 1 solutions Answer 412246 by Alan3354(30993)   on 2012-10-06 10:22:37 (Show Source): You can put this solution on YOUR website! Where do I become? Don't know what that means. ----------- I have no idea how to work this problem.(a+b)/(c)=(x)/(d) ----- That's not a problem, it's an equation. Step 1, say what you want to do.

Surface-area/662432: if l=14 cm and w=8 cm , how do you write an expression for the perimeter or a rectangle ? how do you find the perimeter of the rectangle ? write and expression for the area of the rectangle . find the area of the rectangle 1 solutions Answer 412239 by Alan3354(30993)   on 2012-10-06 09:36:30 (Show Source): You can put this solution on YOUR website! if l=14 cm and w=8 cm , how do you write an expression for the perimeter or a rectangle ? Look at a piece of paper, or the monitor. The perimeter is the distance around the outside. Start at any corner and add the distances moved around the object, back to the starting point. --------------------- how do you find the perimeter of the rectangle ? See above. ----------------------- write and expression for the area of the rectangle . Area = L*W, Length times Width ------- find the area of the rectangle You find it.

Travel_Word_Problems/662433: The highway roads intersect at right angle. A car is 12 kilometers from the intersection at the same time that a truck is 5 kilometers from the same point. If the car is twice as fast as the truck, at what time will they be 5 kilometers apart? 1 solutions Answer 412236 by Alan3354(30993)   on 2012-10-06 09:24:47 (Show Source): You can put this solution on YOUR website! The highway roads intersect at right angle. A car is 12 kilometers from the intersection at the same time that a truck is 5 kilometers from the same point. If the car is twice as fast as the truck, at what time will they be 5 kilometers apart? ------------------- The speeds have to be given. If they move at the speed of light, it will take less time than at 1 mm/month.

Quadratic_Equations/662434: The area of an equilateral triangle is 20 square meters. One of its sides is 10 meters long. What are the maximum dimensions of the triangle? 1 solutions Answer 412232 by Alan3354(30993)   on 2012-10-06 08:56:20 (Show Source): You can put this solution on YOUR website! The area of an equilateral triangle is 20 square meters. One of its sides is 10 meters long. What are the maximum dimensions of the triangle? -------------- If 1 side = 10 meters, all are 10 meters. The area is not 20 sq meters. ------ There's no max or min, it's 10 meters, that's given.

Surface-area/662239: for a regular dodecagon with side measure of 10cm and apothem of 18.67cm find the area and perimeter 1 solutions Answer 412174 by Alan3354(30993)   on 2012-10-05 21:30:15 (Show Source): You can put this solution on YOUR website! for a regular dodecagon with side measure of 10cm and apothem of 18.67cm find the area and perimeter --------------- n = # of sides, s = side length --------- Perimeter = n*s

Percentage-and-ratio-word-problems/662332: 55% of what is 60.6 m? 1 solutions Answer 412114 by Alan3354(30993)   on 2012-10-05 18:51:45 (Show Source): You can put this solution on YOUR website! 55% of what is 60.6 m? -------- 0.55*what = 60.6 m what = 60.6 m/0.55 what = 110.181818... m

Polynomials-and-rational-expressions/662328: factor 2a^2+28a+98 1 solutions Answer 412113 by Alan3354(30993)   on 2012-10-05 18:37:29 (Show Source): You can put this solution on YOUR website! factor 2a^2+28a+98 ------------ All the coefficients are even numbers. --------- Factor out a 2, then notice that both ends are perfect squares.

Systems-of-equations/662278: -3(x-5)=51 1 solutions Answer 412112 by Alan3354(30993)   on 2012-10-05 18:35:43 (Show Source): You can put this solution on YOUR website! -3(x-5)=51 (x-5) = -17 x = -12

Angles/662337: The measure of an angle is seventeen times the measure of a supplementary angle. What is the measure of each angle? 1 solutions Answer 412110 by Alan3354(30993)   on 2012-10-05 18:32:49 (Show Source): You can put this solution on YOUR website! The measure of an angle is seventeen times the measure of a supplementary angle. What is the measure of each angle? ------------ A = the angle S = the supplement ---- A + S = 180 A = 17S ------ 17S + S = 180 etc

Triangles/662304: my problem is this. Solve the problem.The sum of the measures of the angles in any triangle is 180 degrees. In triangle ABC, angles A and B have the same measure, while angle C is 42 degrees larger than each of the other two angles. Find the measure of angle C. i don't understand how to find the measure of angle C. 1 solutions Answer 412107 by Alan3354(30993)   on 2012-10-05 18:30:06 (Show Source): You can put this solution on YOUR website! In triangle ABC, angles A and B have the same measure, while angle C is 42 degrees larger than each of the other two angles. Find the measure of angle C. ================ A = B C = A + 42 ---- A + B + C = 180 A + A + A+42 = 180 3A + 42 = 180 3A = 138 A = B = 46 degs C = A + 42 C = 88 degs

Exponents/662330: whats 3 3/7 times 1 1/4 1 solutions Answer 412106 by Alan3354(30993)   on 2012-10-05 18:27:26 (Show Source): You can put this solution on YOUR website! whats 3 3/7 times 1 1/4 ------------- = (24/7)*(5/4) = 120/28 = 30/7

Linear-systems/662280: Solve the system by the substitution method 4x + y = 25 3x + 4y= 22 the answer the teacher got was 5,10 but I can not figure out how to get there. 1 solutions Answer 412074 by Alan3354(30993)   on 2012-10-05 15:01:09 (Show Source): You can put this solution on YOUR website! Solve the system by the substitution method 4x + y = 25 --> y = 25 - 4x 3x + 4y= 22 ------------- Sub for y in the 2nd eqn 3x + 4*(25-4x) = 22 3x + 100 - 16x = 22 -13x = -78 x = 6 ------ y = 25-4x y = 1 --> (6,1) ============ If you sub (5,10), you'll see it doesn't fit