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Recent problems solved by 'Alan3354'

Alan3354 answered: 30973 problems
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Linear-equations/423157: P(3,-7),Q(-1,-7) 1 solutions Answer 295222 by Alan3354(30993)   on 2011-03-16 20:34:31 (Show Source): You can put this solution on YOUR website! Do you have a question?

Travel_Word_Problems/423018: man travel 60 miles for the first leg of trip then 54 miles second leg, travels 4.5 hours total. distance traveled is 225 miles total. 1 solutions Answer 295193 by Alan3354(30993)   on 2011-03-16 18:48:01 (Show Source): You can put this solution on YOUR website! Do you have a question?

Expressions-with-variables/423026: C= 5(f-32)divided by 9 for f 1 solutions Answer 295192 by Alan3354(30993)   on 2011-03-16 18:46:37 (Show Source): You can put this solution on YOUR website! C = (5/9)*(F-32) (9/5)*C = F - 32 F = (9/5)*C + 32 ---------------- F = (9*C + 160)*2/10 more useful eg, to convert from 37 C to F: 37*9 = 333 Add 160 = 493 x2 = 986 move the decimal --> 98.6 F commonly used as normal body temperature, tho there's at least 1 deg F variation in that.

Graphs/423056: How would you graph this equation and what would be the y intercept? x=3y=9 1 solutions Answer 295180 by Alan3354(30993)   on 2011-03-16 18:17:12 (Show Source): You can put this solution on YOUR website! Too many equal signs.

Inequalities/422938: your age is greater than 12 years old. 1 solutions Answer 295170 by Alan3354(30993)   on 2011-03-16 17:49:21 (Show Source): You can put this solution on YOUR website! How did you know?

test/423034: Y=x-3 1 solutions Answer 295168 by Alan3354(30993)   on 2011-03-16 17:47:32 (Show Source): You can put this solution on YOUR website! Do you have a question?

Geometry_proofs/423032: given: circle p prove: triangle axb ~ triangle cxd 1 solutions Answer 295166 by Alan3354(30993)   on 2011-03-16 17:45:46 (Show Source): You can put this solution on YOUR website! No diagrams are shown

Inequalities/422946: at least 80 runners showed up for the charity race. 1 solutions Answer 295164 by Alan3354(30993)   on 2011-03-16 17:44:08 (Show Source): You can put this solution on YOUR website! Do you have a question?

Pythagorean-theorem/423029: A=4 c=8 1 solutions Answer 295161 by Alan3354(30993)   on 2011-03-16 17:41:15 (Show Source): You can put this solution on YOUR website! Do you have a question?

Inequalities/422954: n < -11 1 solutions Answer 295126 by Alan3354(30993)   on 2011-03-16 15:58:19 (Show Source): You can put this solution on YOUR website! Do you have a question?

test/422657: In trting to fins out how i can solve this linear system problem u-v= 0 and 7u+v=0 using substitution method 1 solutions Answer 294987 by Alan3354(30993)   on 2011-03-15 21:53:35 (Show Source): You can put this solution on YOUR website! u-v= 0 --> u = v 7u+v=0 7v+v = 0 v = 0 u = 0

Problems-with-consecutive-odd-even-integers/422442: the sum of three consecutive odd integers is 81. find the intereg. 1 solutions Answer 294873 by Alan3354(30993)   on 2011-03-15 14:41:09 (Show Source): You can put this solution on YOUR website! 81/3 = 27, the middle number --> 25, 27 & 29

Surface-area/422064: what is the answer to 1/64 can this be re dosted yes or no 1 solutions Answer 294630 by Alan3354(30993)   on 2011-03-14 17:05:57 (Show Source): You can put this solution on YOUR website! There's no answer to 1/64, it's not a question. What is "re dosted?"

Exponential-and-logarithmic-functions/421970: Find each value of x. 2^log2 ^5=x 1 solutions Answer 294582 by Alan3354(30993)   on 2011-03-14 13:58:45 (Show Source): You can put this solution on YOUR website! x = 2^log2 ^5 x = 2^log(32) x =~ 2^1.50515 x =~ 2.8385

Numbers_Word_Problems/421967: The sum of the page numbers on the facing pages of a book is 285. Find the larger page number. 1 solutions Answer 294581 by Alan3354(30993)   on 2011-03-14 13:57:10 (Show Source): You can put this solution on YOUR website! The sum of the page numbers on the facing pages of a book is 285. Find the larger page number. ------------ 285/2 = 142.5, the middle --> 142 & 143

Travel_Word_Problems/421927: How far does a plane travel in the last five minutes of the flight, before it lands? 1 solutions Answer 294580 by Alan3354(30993)   on 2011-03-14 13:56:17 (Show Source): You can put this solution on YOUR website! Different planes travel different distances.

Quadratic-relations-and-conic-sections/421972: how do you factor (x+21)(x-6)? 1 solutions Answer 294579 by Alan3354(30993)   on 2011-03-14 13:54:20 (Show Source): You can put this solution on YOUR website! It's already factored.

Travel_Word_Problems/421963: Jake flew his plane 500 miles against the wind in the same time as it took him to fly 700 miles with the wind. If the speed of the wind is 40 mph, what was the speed of the plane? So far for the set up of the problem I have Jake against the wind and Jake with the wind. R*T= D so Jake against the wind 500D=R-40 *T and Jake with the wind is 700D=S+40*T but I don't know how to set this up for solving 1 solutions Answer 294577 by Alan3354(30993)   on 2011-03-14 13:53:16 (Show Source): You can put this solution on YOUR website! Jake flew his plane 500 miles against the wind in the same time as it took him to fly 700 miles with the wind. If the speed of the wind is 40 mph, what was the speed of the plane? ---------------- a = airspeed of the plane 700 = (a+40)*t 500 = (a-40)*t ----------- t = 700/(a+40) = 500/(a-40) 700*(a-40) = 500*(a+40) 700a - 28000 = 500a + 20000 200a = 48000 a = 240 mi/hr

Travel_Word_Problems/421928: How far does a plane travel in the first 3 minutes after take off? 1 solutions Answer 294565 by Alan3354(30993)   on 2011-03-14 12:44:06 (Show Source): You can put this solution on YOUR website! Different planes travel different distances.

real-numbers/421950: Find two rational numbers between 1 and 999/1000 I know that 1 is the same as 1000/100, so I do not know how there can be a rational number between 1000/100 and 999/1000 1 solutions Answer 294564 by Alan3354(30993)   on 2011-03-14 12:39:59 (Show Source): You can put this solution on YOUR website! Find two rational numbers between 1 and 999/1000 I know that 1 is the same as 1000/100, so I do not know how there can be a rational number between 1000/100 and 999/1000 ------------- 1 = 1000/1000, not 1000/100. ------------ 1 = 100000/100000 999/1000 = 9990/100000 --> 9991/100000, 9992/100000, etc

logarithm/421709: log3^X=4 1 solutions Answer 294454 by Alan3354(30993)   on 2011-03-13 20:45:15 (Show Source): You can put this solution on YOUR website! log3^X=4 x*log(3) = 4 x = 4/log(3) Just calculator work now.

Numbers_Word_Problems/421739: what are the consecutive even numbers between 50 and 80? 1 solutions Answer 294453 by Alan3354(30993)   on 2011-03-13 20:43:36 (Show Source): You can put this solution on YOUR website! 52, 54, 56...78

Linear-equations/421754: Ok What is the answer for 4x - y = 6? 1 solutions Answer 294452 by Alan3354(30993)   on 2011-03-13 20:41:52 (Show Source): You can put this solution on YOUR website! What is the question?

Points-lines-and-rays/421761: (3,-3); 4x-5y=9 1 solutions Answer 294451 by Alan3354(30993)   on 2011-03-13 20:41:26 (Show Source): You can put this solution on YOUR website! Do you have a question?

Exponential-and-logarithmic-functions/421723: I need help solving this problem: log(4x+10)=3 Any help you could give is greatly appreciated. 1 solutions Answer 294429 by Alan3354(30993)   on 2011-03-13 19:12:41 (Show Source): You can put this solution on YOUR website! log(4x+10)=3 4x+10 = 1000 etc

Numbers_Word_Problems/421602: Find three consecutive integers whose sum of the first and the third is -88 1 solutions Answer 294403 by Alan3354(30993)   on 2011-03-13 14:30:45 (Show Source): You can put this solution on YOUR website! n = 1st n + (n+1) + (n+2) = -88 3n + 3 = -88 3n = -91 n <> integer ------------ No such numbers. The sum of 3 consecutive numbers is always a multiple of 3. Also 3 odd or even, or any consistently spaced, integers add to a multiple of 3.

Rational-functions/421536: 2x^2+2y^2=98 1 solutions Answer 294402 by Alan3354(30993)   on 2011-03-13 14:21:07 (Show Source): You can put this solution on YOUR website! Do you have a question?

Triangles/421580: In a right triangle, if r and s are the lengths of the legs and t is the length of the hypotenuse, then? 1 solutions Answer 294401 by Alan3354(30993)   on 2011-03-13 14:20:14 (Show Source): You can put this solution on YOUR website! sin(R) = r/t sin(S) = s/t tan(R) = r/s Angle T = 90 degs etc

Trigonometry-basics/421595: what is the exact value of tan -240degrees 1 solutions Answer 294400 by Alan3354(30993)   on 2011-03-13 14:17:32 (Show Source): You can put this solution on YOUR website! =

Angles/421577: if (-2, y) lies on 3x+5y=9, what is y? 1 solutions Answer 294399 by Alan3354(30993)   on 2011-03-13 14:16:12 (Show Source): You can put this solution on YOUR website! if (-2, y) lies on 3x+5y=9, what is y? ------------- Sub -2 for x 3*-2 + 5y = 9 5y = 15 y = 3

Surface-area/421354: A dog owner has 250ft of fencing to enclose a rectangular run area for his dog. If he wants the maximun possible ares, what should the length and width of the rectangle be? i did 2x+2z=250 then got the equation 2z=250-2x using -b/2a i got -250/-4=62.5=x then 2z=250-2(62.5) and got z =62.5 which would mean each side is 62.5 and that checks out because 62.5*4=250 but how do i know thats the maximun area and also thats a square since all sides are equal? can anyone please please tell me what i did wrong or what i need to do? thank you!! 1 solutions Answer 294265 by Alan3354(30993)   on 2011-03-12 18:49:09 (Show Source): You can put this solution on YOUR website! A dog owner has 250ft of fencing to enclose a rectangular run area for his dog. If he wants the maximun possible ares, what should the length and width of the rectangle be? ---------------- The max area for a rectangle is a square. The perimeter = 250 ft = 2L + 2W --> L + W = 125 W = 125 - L -------- Area = L*W = L*(125 - L) is a parabola. The max is at the vertex The line of symmetry is L = -b/2a L = 125/2 = 62.5 The vertex is on the line of symmetry at f(-b/2a) = f(62.5) That proves that 62.5 ft gives the max area for the given perimeter. Max area = 62.5^2 = 3906.25 sq ft