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# Recent problems solved by 'maali40'

maali40 answered: 13 problems
 Expressions-with-variables/170465: This question is from textbook Introductory Algebra Virginia's AT&T 9002 cordless phone has a range of 1000 ft. Her apartment is a corner unit, located as shown in the figure below. Will Virginia be able to use the phone at the community pool? picture shows the distance from the apartment to the ground is 180 ft., the distance from the ground on the outside of the building to the far side of the grounds is 600 ft., and the distance from the far side of the grounds to the far side of the pool is 400 ft. (looks like a U shape)1 solutions Answer 125850 by maali40(13)   on 2008-12-01 07:09:38 (Show Source): You can put this solution on YOUR website!yes note 2*182=372 SHORTEST DISTANCE BETWEEN 2 POINTS IS...
 Expressions-with-variables/170455: This question is from textbook Introductory Algebra Solve the problem. Marty leaves the airport in his private plane and flies due east at 186 mph. Two hours later, a jet leaves the same airport and flies due east at 434 mph. When will the jet overtake Marty's plane?1 solutions Answer 125843 by maali40(13)   on 2008-12-01 06:47:13 (Show Source): You can put this solution on YOUR website!186*x=(x-2)*434 868=(434-186)*x x=868/248 hours answer is x hrs after marty left airport.Is the airport moving?? anyway we are saying in3.5hrs marty went 186*3.5 miles in1.5 hrs the other jet go's 186*3.5 MILES =1.5*434 MILES JA DAT'S WHAT SAYING.tHESE ARE INTERESTING 186 mph relative to what? Must be saying 186 miles ,in straight line , away from airport in 1 hour. So in 2 hrs 392 miles away.in 1.5 hrs more (392 +1.5*186) miles away.In 1.5 hrs the other jet is 1.5* 434 miles away if on same straight line he gets hit in rear?? dONT'T FORGET YOUR WATCH!
 Finance/170450: Hi, Here's one more "Algebra in Finance" GRE prep word problem I don't know how to solve: A group can charter a particular aircraft at a fixed total cost. If 36 people charter the aircraft rather than 40 people, the cost per person is greater by \$12. What is the cost per person if 40 people charter the aircraft? Thanks again, Julie1 solutions Answer 125842 by maali40(13)   on 2008-12-01 06:11:31 (Show Source): You can put this solution on YOUR website!\$108.00 cost of charter is\$4320.00 4320/36= 120
 Quadratic_Equations/170445: if a quadratic trinomial cannot be factored, what kind of trinomial is it? Give example and explain.1 solutions Answer 125841 by maali40(13)   on 2008-12-01 05:52:38 (Show Source): You can put this solution on YOUR website!Quadractic is polynomial of degree 2.A1*x^2+A2*x+A3 some like Ax^2 +Bx + C Notice (x-3)*(x-4) not= x^2 -7*X +12 'WHEN CAN YOU GET AWAY WITH SAYING IT IS????' (-3)*(-4) = (-1)^2*12 What's (-1)^2? When? What's (x^2-4)/(x-2) are u at level u "STAY AWAY FROM 'DIVISION BY 1-1"? wHY? cAN'T GENERALLY SOLVE FOR x 'complete square heh both work the "roots" are ,when have x^2+bx +c ,(-b+(or-)(b^2-4*c)^.5)/2 where b^2=>4*c OR NO ROOTS UNLESS SOME FANTASY!!DID YOU SEE SOMEWHERE 'DONE WITH FACTORING THEN PROCEEDS MORE"FACTORING" AND "FORMULAS" What did u think about that???Are u studying algebra for the 'grade' ? then stick it
 Numbers_Word_Problems/170444: The perimeter of a rectangle is 22 cm. The length is 7 cm longer than the width. What are the length and width of the rectangle? I figure p = 22 cm; l = 7 cm + width; l + w = 22 cm; 2l + 2w = 22 cm; I don't know where to go from there. I'm sorry. I really appreciate your help. (Pre-Algebra didn't prepare me for algebra word problems.) This does not come from a textbook, but from a sample test from the head of the Math Dept. Thank you very much.1 solutions Answer 125840 by maali40(13)   on 2008-12-01 05:21:35 (Show Source): You can put this solution on YOUR website!i DON'T UNDERSTAND YOUR PROBLEM what did you say l was ? 7cm.+w .So you say 2l+2w=22cm. so why don't you say 14cm. +2w +2w=22cm. Therefore w=2cm. l=9cm. Course l=7+w 22=2l+2w 14 +4w=22 w=2 l=9 all units the same -no??
 Numbers_Word_Problems/170446: This question is from textbook e-math Find two consecutive integers such that the sum of one-third the first and one-fourth the second is nine.1 solutions Answer 125839 by maali40(13)   on 2008-12-01 04:59:49 (Show Source): You can put this solution on YOUR website!Two consecutiive integers N and (N+1) where N/3+(N+1)/4=9 N*4/12 +(N+1)*3/12=9 4*N+3*N+3=12*9 7*N=108-3 N=105/7 N=15 (N+1)=16 ______________________________ N/M +(N+1)/(M+1) = ((2M+1)N+M)/(M(M+1))= 2+j(2M+1) When N=M+jM(M+1) for j=0,1,2 ,,,,j IS NOT THAT GENERAL??
 Percentage-and-ratio-word-problems/170225: Slick jim won the lottery.he spent Two thirds of his winnings on a very posh house.he spent two thirds of what he had left on a luxury yacht. Then he spent two thirds of what he had left on a hot air balloon. He spent his last £20000 on a flashy car. How much did Slick Jim win on the lottery? many thanks,dj.1 solutions Answer 125655 by maali40(13)   on 2008-11-30 06:55:09 (Show Source): You can put this solution on YOUR website!W pounds ='s winnings L='s 200000 2/3*W * (the sum of parts that follow as j=0 to 2 of (1/3)^j) = W-L=2/3*W*((1/3)^3-1)/(1/3-1)=52/54*W =W-200000. Therefore w=200000/27
 Rational-functions/170223: My question pertains to a rational function that appears on page 36 in W.W. Sawyer's short book(not a textbook) entitled What Is Calculus About? At one point on this page, Sawyer says that velocity equals (-1)x t^-2. So, the equation is v= (1)x t^-2. Sawyer notes that ^t-2 can be changed to 1/t^2. Then he says that v= -1/t^2. But when I multiply -1/-1 times 1/t^2 I get -1/-t^2 instead of -1/t^2. I assume that I am doing something wrong. What am I doing wrong? Why does the correct transformation result in -1/t^2 rather than -1/-t^2? 1 solutions Answer 125652 by maali40(13)   on 2008-11-30 05:05:59 (Show Source): You can put this solution on YOUR website!Seems your question is in regard to using implied multiplication in syntax or using a multiplication symbol (for example 3*4=12) (5b=5*b) (course we don't say 54=5*4 unless defined only have 0 to 9 in use and using implied multiplication then 67=6*7).The question here is are we not saying we are not using implied multiplication since say (-1)*t^..ETC,meaning then the exponent is -2 and have therefore -1/t^2 WHERE OF COURSE UNDERSTOOD t^-2 THE '-SIGN' NOT ALGEBRA OPERATOR BUT SYMBOL USED TO DENOTE RECIPROCAL (t^2)-1=1/t^2.If did have implied mulltiplication t^-x would be 1/t^1*x=(1/t^1)*x=x/t. Problem if using implied multiplication and wanted exponent to be -x=-1*x and said have t^(-x) ,there is a standard symbol named superscript which example of use is 5^(3) =5!/(5-3)! where note that is not algebra - operator but more like what most may think - is.So when see b=x/y and a^b understand did not want to say a^(x/y) also did not want to say (a^x)^(1/y)or (a^x)^(y^-1).Course if want an exponent b*c could do (a^b)^c.Did I correctlly assume your question was in regard to syntax so all would read the same? Hope helps you .Course remember I am not saying there is any worth in any of this except standard simple knowledge in country where who cares what you know?And I've heard for example POE died broke in jail.yours truly M. Ali ( just for fun won't check my typing anymore just post see if you find errors?)
 Quadratic_Equations/169928: Perform the indicated operation: a) ((x^2+x-2)/x )/ (x+2)/x^2 b) (1/x-3)+((x-1)/(x^2+3x+9))+(x^2+x-3)/(x^3-27)1 solutions Answer 125367 by maali40(13)   on 2008-11-27 21:32:17 (Show Source): You can put this solution on YOUR website!((x^2+x-2)/x )/ (x+2)/x^2 is(x-1)*(x+2)/x/(x+2)/x^2=(x-1)/x^3 unless x=-2 then it's 1/x^2 (1/x-3)+((x-1)/(x^2+3x+9))+(x^2+x-3)/(x^3-27) is ((x-1)*(x-3)+x^2+x-3)/(x^3-27)+(1-3x)/x unless x=3 then it's (0-8)/3+(2+0)/27+(9+3*0)/27/0 where 0 -+1+-1 " -1+1 or 1-1"
 Miscellaneous_Word_Problems/169742: Please help me solve this problem. What is the ratio (r) of this geometric progression? 3 square root of 3, 18, 36 square root of 3, 216, ... r= __________________________________ 1 solutions Answer 125118 by maali40(13)   on 2008-11-26 03:36:59 (Show Source): You can put this solution on YOUR website!How do you know you have what you have? You have a 'function of t' for interval x to x+c (I*z=c).You have b=x/z and z*r^b times the sum of the parts that follow, as i is 0 to I-1,r^i. What you need to see is that r=a^z(only positive to non-integer exponents)and you have z*a^x times the sum of the parts that follow,as i is 0 to I-1,(a^i)^z which totals to (z*a^x*(a^c-a))/(a^z-1).So you see you are summing rectangles involved with 'function t=a^t' for t=i*z+x.And do you see that the difference of f(u) for u=t+z and u=t,divided by z is a^t when f(u) z*a^u/(a^z-1)?.And also a^t is same as (for all intents and purposes?)sum of the parts that follow ,as j=0 to sufficient,t^j*log(a)^j/ j!. ( (e^t)^log(a)) is a^t.If had 'desk top' for symbols standard in mathematics mighthave made this prettier? yours truly Michael Ali unemployed bascically for all my life and broke so are u sure you want to bother learning things i may be expert in regard to?
 Length-and-distance/167994: THE LENGTH OF A RECTANGULAR WAL IS 3M MORE THAN TWICE ITS HEIGHT. THE WIDTH OF A PICTURE ON THE WALL IS 1M LESS THAN THE HEIGHT OF THE WALL. THE PICTURE IS 2M LONGER THAN IT IS WIDE. FIND THE AREA OF THE WALL IF 19 M SQUARED OF THE WALL ARE NOT COVERED BY THE PICTURE?1 solutions Answer 124962 by maali40(13)   on 2008-11-25 01:42:29 (Show Source): You can put this solution on YOUR website!Height of wall = H meters Length of wall =(3+2H)meters Width of picture=(H-1) meters Length of picture=(H+1) meters Area of wall= (3H+2H^2) square meters ----- 3+2H+(3+2H-H-1)(H-1)=19 3+2H+(2+H)(H-1)=19 3+2H+2H+H^2-2-H=19 -------------H^2+3H-18=0 H=(-3+(9-4(-18))^.5)/2 H=3
 logarithm/169545: Solve the equation. [1/8]^-2p=2^3p+2 8^2*p=8*p+2 64*p=8*p+2 56*p=2 p=2/56=1/28 NOTE (64-8)p=(8-8)p+2 but no division by (1-1) here we see 64*1/28=8*1/28 +56/28 just to see no algebra operator to get 56*p=2 a. p=2/3 b. p=-2/9 c. p=-9/2 d. p=3/21 solutions Answer 124959 by maali40(13)   on 2008-11-25 00:43:40 (Show Source): You can put this solution on YOUR website!Solve the equation. [1/8]^-2p=2^3p+2 8^2*p=8*p+2 64*p=8*p+2 56*p=2 p=2/56=1/28 NOTE (64-8)p=(8-8)p+2 but no division by (1-1) here we see 64*1/28=8*1/28 +56/28 just to see no algebra operator to get 56*p=2 a. p=2/3 b. p=-2/9 c. p=-9/2 d. p=3/2 e. none of these
 Expressions-with-variables/169534: 1 solutions Answer 124955 by maali40(13)   on 2008-11-24 23:36:47 (Show Source): You can put this solution on YOUR website!x=-2 y=5 z=-3 1. x+y-z (-2 +5 -(-3) )=(2*(-1+1)+3-(-3))=(2(-1+1)+3(1+(-)^2))for all intents here =(3(1+1))=6 no 'division by (1-1)' so arithmetic suffices. 2. 2y-2 ----------=(2*5-2)/(-2)=(5-1)/(-1)=(4+(1-1))/(-1) 'here' =-4 x 3. x + 31 ---- ----- =-2/5/(-3)+31/30=2/15+31/30=4/30+31/30=35/30=7/6 y*z 30 4. z - y - 12.7=(-3)-(5)-(12.7)=-20.7=-20-7/10=-207/10