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# Recent problems solved by 'Alan3354'

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 Polygons/520800: The measure of each exterior angle of a regular polygon is (2/3) that of an interior angle. How many sides does the regular polygon have?1 solutions Answer 346217 by Alan3354(30965)   on 2011-10-25 10:53:55 (Show Source): You can put this solution on YOUR website!I + (2/3)I = 180 I = 108 degs (internal angles) ext angle = 72 degs 360/72 = 5 sides
 decimal-numbers/520324: what is the answer to 3.77 times 10 to the 4th power? my answer is 37,700 is this correct? 1 solutions Answer 346026 by Alan3354(30965)   on 2011-10-24 17:35:53 (Show Source): You can put this solution on YOUR website!They're equal.
 real-numbers/520328: convert 1200 dm (second power)= ____________________hm1 solutions Answer 346024 by Alan3354(30965)   on 2011-10-24 17:34:22 (Show Source): You can put this solution on YOUR website!What's hm mean?
 Quadratic-relations-and-conic-sections/520251: The coordinates of the point on the parabola y^2=8x which is at minimum distance from the circle x^2+(y+6)^2 is1 solutions Answer 346011 by Alan3354(30965)   on 2011-10-24 16:52:28 (Show Source): You can put this solution on YOUR website!The circle eqn is not complete
 Pythagorean-theorem/520293: using the rule of pythagoras to find the other leg and the hypotenus of a right triangle for each leg with the value of 7?1 solutions Answer 346010 by Alan3354(30965)   on 2011-10-24 16:44:06 (Show Source): You can put this solution on YOUR website!Can you reword that?
 Probability-and-statistics/520284: plums cost 0.32 each which is closest esitmate to the cost of 18 plums 1 solutions Answer 346009 by Alan3354(30965)   on 2011-10-24 16:43:13 (Show Source): You can put this solution on YOUR website!0.32*18 = 5.76
 Travel_Word_Problems/520269: Tom travels 60 miles per hour going to a neighboring city and 50 miles per hour coming back using the same road. He drove a total of 5 hours away and back. What is the distance from Tom's house to the city he visited?1 solutions Answer 346008 by Alan3354(30965)   on 2011-10-24 16:33:52 (Show Source): You can put this solution on YOUR website!Tom travels 60 miles per hour going to a neighboring city and 50 miles per hour coming back using the same road. He drove a total of 5 hours away and back. What is the distance from Tom's house to the city he visited? --------------- The avg speed of the round trip is 2*60*50/(60 + 50) = 6000/110 mi/hr ----------- This is similar to parallel resistors or parallel flows, but x2 Note that the avg speed is not 55 because more time is spent going 50 mi/hr. ----------- = 600/11 mi/hr d = r*t = 5*(600/11) miles round-trip d = 1500/11 miles one-way d =~ 136.4 miles
 Polygons/520280: find the number of sides of a regular polygon each of whose exterior angles contain 30 degrees1 solutions Answer 346007 by Alan3354(30965)   on 2011-10-24 16:29:01 (Show Source): You can put this solution on YOUR website!360/30 = 12 sides
 Probability-and-statistics/520257: find an angle between 0degrees and 360degrees that is coterminal with -480degrees. Find an angle between 0 and 2pi that is coterminal with 15pi/2?1 solutions Answer 346006 by Alan3354(30965)   on 2011-10-24 16:28:20 (Show Source): You can put this solution on YOUR website!find an angle between 0degrees and 360degrees that is coterminal with -480degrees. Add 360 degs repeatedly until you get a positive number. ------------------- Find an angle between 0 and 2pi that is coterminal with 15pi/2? Subtract 2pi repeatedly until the result is what you need.
 Percentage-and-ratio-word-problems/520274: Explain which is more accurate: measuring to the nearest millimeter or to the nearest eight of an inch. Please help me understand this question.1 solutions Answer 346005 by Alan3354(30965)   on 2011-10-24 16:25:50 (Show Source): You can put this solution on YOUR website!Explain which is more accurate: measuring to the nearest millimeter or to the nearest eight of an inch. ------------ A millimeter is smaller. 1 inch = 25.4 mm 1 inch = eight 8ths of an inch ---------------------- That has no effect on accuracy, tho, only resolution. A person taking measurments in mms can be careless or drunk, and be off by a lot.
 Miscellaneous_Word_Problems/520239: Please help! If an object is thrown upward with an initial velocity of 16 ft/sec, its height, h, in feet, after t seconds is given by h=16t-16t^2 Find the number of seconds before the object hits the ground. (Round your answer to the nearest tenth, if necessary.) Thank you!!1 solutions Answer 346001 by Alan3354(30965)   on 2011-10-24 15:39:56 (Show Source): You can put this solution on YOUR website!If an object is thrown upward with an initial velocity of 16 ft/sec, its height, h, in feet, after t seconds is given by h=16t-16t^2 Find the number of seconds before the object hits the ground. (Round your answer to the nearest tenth, if necessary.) ----------------- It hits the ground when h = 0 h=16t-16t^2 = 0 t = 0 (when it's starts) t = 1 second at impact
 Travel_Word_Problems/520243: On a trip of 80 miles, a man traveled 12 times as far by train as by boat and 4 miles less by bus than by boat. Find the number of miles traveled in each part of the journey. I keep coming back to 12x+x-4= 80 , but I'm sure I'm missing something! Thanks for the help.1 solutions Answer 345999 by Alan3354(30965)   on 2011-10-24 15:35:11 (Show Source): You can put this solution on YOUR website!On a trip of 80 miles, a man traveled 12 times as far by train as by boat and 4 miles less by bus than by boat. Find the number of miles traveled in each part of the journey. ------------------ b = distance by boat 12b + b + (b-4) = 80
 Volume/520233: cylinder has a radius of 50 cm and a volume of 800L calculate the height of this cylinder correct to the nearest whole number....i tried1 solutions Answer 345998 by Alan3354(30965)   on 2011-10-24 15:11:42 (Show Source): You can put this solution on YOUR website!cylinder has a radius of 50 cm and a volume of 800L calculate the height of this cylinder correct to the nearest whole number ------------ Vol = 800 liters = 800000 cubic cms (cc) h = 800000/(2500*pi) h = 102 cm or 1.02 meters
 Length-and-distance/520232: Find the distance of the line PQ where P( 0, -1 ) Q ( 2, -3 ) 1 solutions Answer 345997 by Alan3354(30965)   on 2011-10-24 15:08:42 (Show Source): You can put this solution on YOUR website!Find the distance of the line PQ where P( 0, -1 ) Q ( 2, -3 ) --------- You mean the length of line PQ, or the distance from P to Q. P(0,-1) Q (2,-3) Don't put spaces in the points. ------------- d =~ 2.828
 Probability-and-statistics/520202: A company's computer password must consist of 4 letters with no repetition of letters. How many possible passwords are there?1 solutions Answer 345995 by Alan3354(30965)   on 2011-10-24 15:04:58 (Show Source): You can put this solution on YOUR website!A company's computer password must consist of 4 letters with no repetition of letters. How many possible passwords are there? ------------ If it's not case sensitive, ie, if a is the same as A, b = B, etc, then it's 26*25*24*23 combinations. you can multiply that.
 Length-and-distance/520227: Find the distance of line mn where m ( 10, 4 ) and n ( 10, 0 ) 1 solutions Answer 345994 by Alan3354(30965)   on 2011-10-24 15:02:45 (Show Source): You can put this solution on YOUR website!x = 10 for both points. d = 4
 Travel_Word_Problems/520224: If you are swimming 30ft/min south and the river is flowing 30ft/min north what is your velocity?1 solutions Answer 345993 by Alan3354(30965)   on 2011-10-24 15:01:55 (Show Source): You can put this solution on YOUR website!If you are swimming 30ft/min south and the river is flowing 30ft/min north what is your velocity? ---------------- wrt (with respect to) the water, it's 30 ft/min. wrt the ground, it's 30 - 30 = zero. It's the wet version of a treadmill.
 Travel_Word_Problems/520225: If an elevator is falling down at 50 m/s and you jump at 1 m/s what is your velocity?1 solutions Answer 345992 by Alan3354(30965)   on 2011-10-24 14:59:51 (Show Source): You can put this solution on YOUR website!If an elevator is falling down at 50 m/s and you jump at 1 m/s what is your velocity? -------------- Down is usually negative --> - 50 m/sec --> -50 + 1 = -49 m/sec
 Inequalities/520213: Hi. I am trying to help my daughter with her homework and I can't help. How do you solve 2/3x = -8?1 solutions Answer 345982 by Alan3354(30965)   on 2011-10-24 14:37:42 (Show Source): You can put this solution on YOUR website!2/3x = -8? Multiply by 3 2x = -24 Divide by 2 x = -12
 Numbers_Word_Problems/520164: what is 10% of the product of 9?1 solutions Answer 345979 by Alan3354(30965)   on 2011-10-24 14:31:21 (Show Source): You can put this solution on YOUR website!what is 10% of the product of 9? ----------- The product of 9 and what?
 Angles/520210: what is the angle measurement (7x-14)(4x+19)1 solutions Answer 345977 by Alan3354(30965)   on 2011-10-24 14:29:03 (Show Source): You can put this solution on YOUR website!what is the angle measurement (7x-14)(4x+19) ----------------- What angles?
 Square-cubic-other-roots/520143: 50 squared plus 60 squared = square root of 6251 solutions Answer 345972 by Alan3354(30965)   on 2011-10-24 14:17:10 (Show Source): You can put this solution on YOUR website!50 squared plus 60 squared = square root of 625 ------------- Is that a question? It's not true.
 decimal-numbers/520177: express 0.07569 to 3 significant figures1 solutions Answer 345961 by Alan3354(30965)   on 2011-10-24 13:42:44 (Show Source): You can put this solution on YOUR website!= 0.0757
 Linear-systems/519824: What is It is the pathagoream theorum by the way.1 solutions Answer 345794 by Alan3354(30965)   on 2011-10-23 18:51:05 (Show Source): You can put this solution on YOUR website!= 45 + 61 = 106
 Complex_Numbers/519793: Z^3=i1 solutions Answer 345793 by Alan3354(30965)   on 2011-10-23 18:46:48 (Show Source): You can put this solution on YOUR website!Do you have a question?
 Graphs/519821: How do you graph y= -3x - 2? 1 solutions Answer 345792 by Alan3354(30965)   on 2011-10-23 18:45:12 (Show Source): You can put this solution on YOUR website!It's a straight line, you need 2 points. Pick 2 values for x and find y. Plot the points. Draw a line thru them.
 Travel_Word_Problems/519798: you throw a ball to your friend. the ball leaves your hand 5 feet above the ground and has an initial vertical velocity of 50 ft per second.1 solutions Answer 345790 by Alan3354(30965)   on 2011-10-23 18:44:17 (Show Source): You can put this solution on YOUR website!I remember doing that.
 Travel_Word_Problems/519804: Plane A travels at 200 mph and plane B travels at 500 mph. If plane A has a 2 hours head start how far will both planes travel before plane B overtakes plane A? The book gives me the answer, I need to see the equation please.1 solutions Answer 345788 by Alan3354(30965)   on 2011-10-23 18:43:05 (Show Source): You can put this solution on YOUR website! Plane A travels at 200 mph and plane B travels at 500 mph. If plane A has a 2 hours head start how far will both planes travel before plane B overtakes plane A? The book gives me the answer, I need to see the equation please. ----------- A is 400 miles away (200*2) B gains on A at 300 mph (500 - 200) B overtakes A in 4/3 hours (400/300) d = r*t = (4/3)*500 d = 2000/3 miles
 Proportions/519809: what is the solution to 4/9=r-3/61 solutions Answer 345787 by Alan3354(30965)   on 2011-10-23 18:39:52 (Show Source): You can put this solution on YOUR website!You should say "solve for r" 4/9=r-3/6 r = 4/9 + 1/2 r = 8/18 + 9/18 r = 17/18
 Functions/519763: I need step by step instructions on how to graph a step function. I don't need to see the graph but to just be instructed by words. The step function is f(x) = 2[x] (ceiling function) for the domain -2 < x < 1 (the less than signs are less than or equal to). I would appreciate your help. I am having a lot of trouble on this problem and the help would be great. Thank you.1 solutions Answer 345769 by Alan3354(30965)   on 2011-10-23 17:11:17 (Show Source): You can put this solution on YOUR website!I need step by step instructions on how to graph a step function. I don't need to see the graph but to just be instructed by words. The step function is f(x) = 2[x] (ceiling function) for the domain -2 < x < 1 (the less than signs are less than or equal to). I would appreciate your help. I am having a lot of trouble on this problem and the help would be great. Thank you. ------------- If you mean f(x) = 2|x| It's the same as any other graph. Pick values for x and find y. Plot the points, draw a straight line thru them. In this case, the graph is limited, from x > -2 to x <1
 real-numbers/519761: the problem is y=bx-c how do I solve for y?1 solutions Answer 345767 by Alan3354(30965)   on 2011-10-23 17:08:44 (Show Source): You can put this solution on YOUR website!y is already solved for. y is equal to bx-c