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Alan3354 answered: 30948 problems
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test/538024: If m and n are odd integers, which of the following must also be an odd integer? a)(m+n) (m-n) b)m(n+1) c)mn+1 d)2m+n 1 solutions Answer 353074 by Alan3354(30968)   on 2011-11-28 19:09:12 (Show Source): You can put this solution on YOUR website! If m and n are odd integers, which of the following must also be an odd integer? a)(m+n) (m-n) b)m(n+1) c)mn+1 d)2m+n ----------- Use m = 5 and n = 7: a) 12*(-2) = -24 b) 5*6 = 30 c) 5*7+1 = 36 d) 2*5 + 7 = 17 ------------ a, b & c are eliminated Might be d 2*m is an even number. Adding an odd number, n, --> an odd number. It's d.

Parallelograms/538022: how would you solve the problem 3x=4x-3 1 solutions Answer 353072 by Alan3354(30968)   on 2011-11-28 19:02:22 (Show Source): You can put this solution on YOUR website! I would subtract 4x from both sides, then divide by -1

Polygons/538019: The sum of all the interior and exterior angles of a polygon is 2880. how many sides does the polygon have? 1 solutions Answer 353069 by Alan3354(30968)   on 2011-11-28 19:00:03 (Show Source): You can put this solution on YOUR website! The sum of all the interior and exterior angles of a polygon is 2880. how many sides does the polygon have? ---------------- The easy way: 2880/180 = 16 ---------------- The hard way: The sum of exterior angles is always 360 degs, so the sum of the interior angles is 2520 degs. ------------ sum of int = (n-2)*180 = 2520 n-2 = 2520/180 = 14 n = 16 sides

Pythagorean-theorem/538017: I have a right angle side A is 12 ft. and side B is 20 ft. what is side C opposite angle of 90 degrees? 1 solutions Answer 353068 by Alan3354(30968)   on 2011-11-28 18:56:13 (Show Source): You can put this solution on YOUR website! Caps usually denote angles, and lower case is the side opposite the angle.

test/538013: 4^4×4^5= 1 solutions Answer 353065 by Alan3354(30968)   on 2011-11-28 18:55:00 (Show Source): You can put this solution on YOUR website! = 262144

Numbers_Word_Problems/538003: The sum of the digits of a certain two-digit number is 12. When you reverse its digits you decrease the number by 54. Find the number? 1 solutions Answer 353062 by Alan3354(30968)   on 2011-11-28 18:50:00 (Show Source): You can put this solution on YOUR website! 93

Linear-systems/538000: How do i find the value of x? 1 solutions Answer 353061 by Alan3354(30968)   on 2011-11-28 18:49:23 (Show Source): You can put this solution on YOUR website! It depends on what you know.

Travel_Word_Problems/537930: I need STEPS on how to do this! A boy ran to the store at 6 miles per hour, he walked back at 4 miles per hour. If the roundtrip took hom 10 minutes, how far is the store? 1 solutions Answer 353058 by Alan3354(30968)   on 2011-11-28 18:46:41 (Show Source): You can put this solution on YOUR website! A boy ran to the store at 6 miles per hour, he walked back at 4 miles per hour. If the roundtrip took hom 10 minutes, how far is the store? --------------- Avg speed of the round trip is 2*6*4/(6+4) = 4.8 mi/hr --------- d = r*t = 4.8 mi/hr * (10/60) hr = 0.8 miles round trip --> 0.4 miles each way

Linear-equations/537978: I need to find the intercepts for -4x + 10y = 20. I dont know how to solve it. i tried and got yx= 2(not even a possible answer -_-') and so that shows i need help beacuse the answer is suposed to be points.thank you and please hurry. 1 solutions Answer 353053 by Alan3354(30968)   on 2011-11-28 18:38:57 (Show Source): You can put this solution on YOUR website! I need to find the intercepts for -4x + 10y = 20. ----------- The line crosses the y-axis when x = 0. -4x + 10y = 20. 0 + 10y = 20 y = 2 or (0,2) is the y-int. ---------- The line crosses the x-axis when y = 0. -4x = 20 x = -5 or (-5,0)

Expressions-with-variables/537872: I am not sure how to simplify this problem: I know that if there was one monomial in the denominator than i would divide each monomial in the numerator by the denominator but i am not sure what to do here. Thank You 1 solutions Answer 353023 by Alan3354(30968)   on 2011-11-28 16:58:40 (Show Source): You can put this solution on YOUR website! I am not sure how to simplify this problem: I know that if there was one monomial in the denominator than i would divide each monomial in the numerator by the denominator but i am not sure what to do here. ---------------------- Divide NUM and DEN by 3^n = = = 6

Linear-equations/537846: how do i write 4x-2y=10 in slope and y-intercept form? 1 solutions Answer 353016 by Alan3354(30968)   on 2011-11-28 16:17:31 (Show Source): You can put this solution on YOUR website! You solve for y.

Travel_Word_Problems/537782: A jet leaves Charlotte, North Carolina, airport traveling at an average rate of 564km/h. Another jet leaves the airport one half hour later traveling at 744km/h in the same direction. How long will the second jet take to overtake the first? 1 solutions Answer 353008 by Alan3354(30968)   on 2011-11-28 15:47:29 (Show Source): You can put this solution on YOUR website! A jet leaves Charlotte, North Carolina, airport traveling at an average rate of 564km/h. Another jet leaves the airport one half hour later traveling at 744km/h in the same direction. How long will the second jet take to overtake the first? -------------- The 1st plane is 282 km away when the 2nd leaves (564 * 0.5) The 2nd plane gains on the 1st at 180 km/hr (744 - 564) 282/180 = 1.56667 hours to overtake = 1 hr 34 minutes

Unit_Conversion_Word_Problems/537812: what is the product of 2 ft. 7 in. and 6 1 solutions Answer 353007 by Alan3354(30968)   on 2011-11-28 15:43:30 (Show Source): You can put this solution on YOUR website! what is the product of 2 ft. 7 in. and 6 = 12 ft 42 in 42 in = 3'6" --> 15' 6" ------------ And people don't like metric.

Triangles/537807: in a riqht anqle triaqle if a=8 and b=1 how much is c = ? and how can i fiqure it out? 1 solutions Answer 353006 by Alan3354(30968)   on 2011-11-28 15:39:45 (Show Source): You can put this solution on YOUR website! in a riqht anqle triaqle if a=8 and b=1 how much is c = ? and how can i fiqure it out? -------------- Use Pythagoras. c =~ 8.062

expressions/537810: Can you please help me solve 15n=m? No other info was given. Thank you!!! 1 solutions Answer 353004 by Alan3354(30968)   on 2011-11-28 15:33:50 (Show Source): You can put this solution on YOUR website! solve 15n=m It's already "solved" for m --------- solve 15n=m n = m/15 if solved for n

Average/537796: Todd scored a 90 on test one. What must he score on test two to get a 93 average? 1 solutions Answer 353000 by Alan3354(30968)   on 2011-11-28 15:10:10 (Show Source): You can put this solution on YOUR website! If it's only the 2 tests, 96. 93*2 = 186 186 - 90 = 96. --------------- (90 + s)/2 = 93 90 + s = 186 s = 96

Proofs/537651: prove that m = y/x-b/x 1 solutions Answer 352946 by Alan3354(30968)   on 2011-11-28 10:33:16 (Show Source): You can put this solution on YOUR website! m = y/x-b/x ------- mx = y - b y = mx + b I'm convinced.

logarithm/537653: -(.5log.5+.5log.5)=? 1 solutions Answer 352945 by Alan3354(30968)   on 2011-11-28 10:30:28 (Show Source): You can put this solution on YOUR website! -(.5log.5+.5log.5)=? ----------- If the logs are base 10: = -log(0.5) = log(2) =~ 0.30103

Matrices-and-determiminant/537657: 2x+4y=1 4x+8y=2 1 solutions Answer 352944 by Alan3354(30968)   on 2011-11-28 10:28:18 (Show Source): You can put this solution on YOUR website! Eqn 2 is 2 times eqn 1. --> dependent, no unique solution, an infinite # of solutions.

logarithm/537649: F(x)=3^x-3 The x-3 is in the exponent area. F(-3), F(-1), F(0) Every answer I come up with is wrong. I have tried 3^((-3)-3) 19683 WRONG, I don't know what to do! 1 solutions Answer 352943 by Alan3354(30968)   on 2011-11-28 10:08:52 (Show Source): You can put this solution on YOUR website! F(x)=3^x-3 The x-3 is in the exponent area. F(-3), F(-1), F(0) Every answer I come up with is wrong. I have tried 3^((-3)-3) 19683 WRONG, I don't know what to do! ----------

Travel_Word_Problems/537640: a high speed bullet train accelerates and decelerates at a rate =6 feet per second square. It's maximum cruising speed =95mi/h. Find the minimum time that the train takes to travel between two consecutive stations that are =40 miles apart. 1 solutions Answer 352941 by Alan3354(30968)   on 2011-11-28 09:59:09 (Show Source): You can put this solution on YOUR website! a high speed bullet train accelerates and decelerates at a rate =6 feet per second square. It's [sic] maximum cruising speed =95mi/h. Find the minimum time that the train takes to travel between two consecutive stations that are =40 miles apart. ---------------- 95 mi/hr = 95*22/15 ft/sec = 418/3 ft/sec ------------ The time to accelerate from 0 to 418/3 at 6 ft/sec/sec = (418/3)/6 seconds = 209/9 seconds at the start and at the end of the trip. ---------- Distance traveled in 209/9 seconds = (1/2)*(209/9)*(418/3) times 2 = 83762/27 feet (apx 1618 ft starting, and 1618 stopping) -------------- 40 miles = 211200 feet 211200 - 3236 = 207964 ft @ 418/3 ft/sec --> 1492.56 seconds at cruise 1492.56 + 2*(209/9) = 1539 seconds = 25' 39" ------------- I rode the TGV from Paris to Brussels, it goes 345 mi/hr PS it's = it is

Problems-with-consecutive-odd-even-integers/537385: i need help on finding three consecutive odd intergers whose sum is 117 1 solutions Answer 352882 by Alan3354(30968)   on 2011-11-27 21:17:34 (Show Source): You can put this solution on YOUR website! 117/3 = 39, the middle number --> 37, 39 & 41

Complex_Numbers/537401: What is the multiplicative inverse of 5-9i? 1 solutions Answer 352881 by Alan3354(30968)   on 2011-11-27 21:16:17 (Show Source): You can put this solution on YOUR website! What is the multiplicative inverse of 5-9i? ------------- = =

Trigonometry-basics/537416: how to show the proof of tangent squared x = 2(secant squared x)-tangent squared x 1 solutions Answer 352879 by Alan3354(30968)   on 2011-11-27 21:01:17 (Show Source): You can put this solution on YOUR website! tangent squared x = 2(secant squared x)-tangent squared x 2 tan^2 = 2sec^2 They're not equal.

Geometry_Word_Problems/537340: How many degrees are there in the angle formed by the hands of a clock at 8:30? I'm so confused how can you possibly find the angle measure without using a protractor?!! 1 solutions Answer 352824 by Alan3354(30968)   on 2011-11-27 18:00:47 (Show Source): You can put this solution on YOUR website! How many degrees are there in the angle formed by the hands of a clock at 8:30? -------------- Protracors are "eyeball accurate", not sufficient. The minute hand is at 180 degs (angles measured from 12) The hour hand is at (8.5/12)*360 degs = 255 degs 255- 180 = 75 degs between the 2 pointers

Linear-equations/537338: how do i write y-3=1/2(x-4)in slope intercept form 1 solutions Answer 352822 by Alan3354(30968)   on 2011-11-27 17:55:57 (Show Source): You can put this solution on YOUR website! how do i write y-3=1/2(x-4)in slope intercept form -------------- Solve for y y = 1/2(x-4) + 3 y = (1/2)x - 2 + 3 y = (1/2)x + 1

Travel_Word_Problems/537317: A rabbit lure on a greyhound racetrack is set to travel once around the track at 40 feet per second, and then its speed is increased to 50 feet per second for the second loop around the track. If the total time it takes for the lure to go around the track twice is 135 seconds, what is the distance once around the track? 1 solutions Answer 352821 by Alan3354(30968)   on 2011-11-27 17:54:36 (Show Source): You can put this solution on YOUR website! A rabbit lure on a greyhound racetrack is set to travel once around the track at 40 feet per second, and then its speed is increased to 50 feet per second for the second loop around the track. If the total time it takes for the lure to go around the track twice is 135 seconds, what is the distance once around the track? --------------- Avg speed = 2*40*50/(40+50) = 400/9 ft/sec d = r*t = (400/9)*135 = 6000 ft

Linear-equations/537334: Five linear curves form a what? 1 solutions Answer 352820 by Alan3354(30968)   on 2011-11-27 17:49:02 (Show Source): You can put this solution on YOUR website! There are no linear curves

real-numbers/537319: is .252525....... rational or irrational 1 solutions Answer 352819 by Alan3354(30968)   on 2011-11-27 17:48:22 (Show Source): You can put this solution on YOUR website! Rational. Repeating decimals can be solved for fractions, integer/integer. ------------------- 1n = 0.252525... 100n = 25.2525... 1n = 0.252525... ------------------- subtract 99n = 25 n = 25/99, which is rational

Circles/537293: a circle has a diameter of 6 inches. what is the circle's area, in square inches? 1 solutions Answer 352816 by Alan3354(30968)   on 2011-11-27 17:38:43 (Show Source): You can put this solution on YOUR website! r = d/2 = 3 inches

Volume/537306: My cylinder tank is 79 inches long and 36 inches wide and 36 inches tall, how Many gallons will it hold 1 solutions Answer 352814 by Alan3354(30968)   on 2011-11-27 17:36:39 (Show Source): You can put this solution on YOUR website! My cylinder tank is 79 inches long and 36 inches wide and 36 inches tall, how Many gallons will it hold ------------------- cubic inches 1 gallon =~ 232 cubic inches Vol = pi*79*18^2*36/232 gallons Vol =~ 12478 gallons