Sunday
July 31, 2016

Posts by Reiny

Total # Posts: 35,386

maths
weight of water when full --- x kg weight of empty tank ------- y kg (1/2)x + y = 310 ** (3/4)x + y = 450 *** subtract: *** - ** (1/4)x = 140 x = 560 back in ** 280 + y =310 y = 30 the tank weighs 30 kg
June 4, 2016

math
full capacity ---- x litres (5/7)x - 440 = (2/5)x multiply by 35 , the LCD 25x - 15400 = 14x take over
June 4, 2016

math
Wow, a 100 ft ladder ???? And the base is 40 ft out ??? totally totally unsafe , absurd and against all safety regulations.
June 3, 2016

Math
prob(win) = 1/1000 Expected value = (1/1000)($800) = $.80 which would a "fair" price for the ticket.
June 3, 2016

Math
The period is π , and the amplitude is 7 so we could go with y = 7sin πt we want the min to be 0 and the max to be 14 so we need y = 7sin πt + 7 when t = 0 we want y = 0, so we need a phase shift y = 7sin π(t+Ø) + 7 when t=0, we want y = 0 when t = 1...
June 3, 2016

Add Math
let the point be P(x,y) so √( (x-1)^2 + (y-6)^2 ) = √( (x-3)^2 + (y-2)^2 ) square both sides, and expand x^2 - 2x + 1 + y^2 - 12y + 36 = x^2 - 6x + 9 + y^2 - 4y + 4 4x - 8y = -24 x - 2y = -6 Notice that this is the equation of the right-bisector of the line joining...
June 2, 2016

Polynomials and properties of exponenets
-3(4x+5) = -12x - 15 which is C 5k^2(-6k-2k+6) = -30k^3 - 10k^3 + 30k^2 which is none of them. I suspect a typo, why would you have two like terms in the bracket ? the others are correct
June 2, 2016

algebra
And here I was under the impression that I had answered this for you. http://www.jiskha.com/display.cgi?id=1464879381 Where you actually given some functions that you did not post?
June 2, 2016

algebra
all kinds of functions. Any 3 non-collinear points can be expressed by a quadratic, a cubic, a trig function .... e.g Wolfram found: y = -4.7632sinx + 8.70749cosx - 7.70749 if you want a quadratic" y = ax^2 + bx + c -7 = 4a - 2b + c 1 = c -17 = 9a + 3b + c solve for a, b...
June 2, 2016

Math
slope = (y2 - y1)/(x2 - x1) sub in your values and evaluate
June 2, 2016

math
original room : x m by y m , area = xy case1: (x+2)(y+3) = xy + 16 xy + 3x + 2y + 6 = xy+16 3x + 2y = 10 case2: (x-1)(y+2) = xy + 16 xy + 2x - y - 2 = xy+16 2x - y = 18 solve: 3x+2y=10 2x -y = 18 I get a negative value for y, which makes no sense check your problem, or your ...
June 2, 2016

Chemistry , not maths
to get the tutor for your question, make sure your subject is correct
June 2, 2016

Simultaneous equation
It is just a matter of translating the English to Math. Going with your definitions of A and B "the sum of their ages" ---> A + B "the difference of their ages" --> A-B "is equal to 5 times" ---> = 5(.... (the sum of their ages) is equal...
June 2, 2016

math
simple method: numbers which divide by 630 leaving remainder of 6: 636 1266 1896 2526 3156 3786 4416 ... numbers which divide by 940 leaving remainder of 4: 944 1884 2824 3764 ...... looks hopeless alternate method Let that number be k then k/630 = x + 6/630 --> k = 630x + ...
June 2, 2016

MAth
What is 200(1.06)^2 - 200 ?
June 1, 2016

Mathematics
False! Counter-example 4 possible multiples of 6 are 6, 12, 30, and 42 their sum is 90 but 90 is not divisible evenly be 12, so the statement is false
June 1, 2016

Math trig
first one is true tan A = sinA/cosA square both sides: tan^2 A = sin^2 A/cos^2 A watch the second one, wouldn't the 2's on the right side cancel for you in your equation?? correct way: since tanA = sinA/cosA so 2(tanA) = 2(sinA/cosA) = 2sinA/cosA
June 1, 2016

math
slope = (.4 + 14)/(4+5) = 14.4/9 = 144/90 = 8/5 so using (-5,-14) y+14 = (8/5)(x+5) 5y + 70 = 8x + 40 8x - 5y = 30
June 1, 2016

Pre-Cal: Plz help!
[(X^(2)+3)^(1/3)](-1)(x^(-2))+[1/3(x^(2)+3)^(-2/3)](2x)(x^(-1)) = [ ( x^2 + 3)^(1/3) ] ( -1/x^2 ) + [ (1/3) /(x^2 + 3)(2/3) ](2x/x) I entered it exactly the way you typed it, and did not get that answer. Check your brackets http://www.wolframalpha.com/input/?i=simplify+%5B(X%...
June 1, 2016

Quadratic Functions2
This question and the other one I just answered for you are fundamental questions that you just have to know how to do in this topic. To simply say, "I can't figure out how to get the answer" tells me you are not even in the course. Anyway.... since you know the ...
June 1, 2016

Quadratic Functions1
1. f(x)= 3(x-2)^2-6 with zeros of 0.59 and 3.41 everything you asked for , except the y-intercept, can simply be stated directly from the equation: x-intercepts, you stated them already axis of symmetry: x-2 = 0 or x = 2 vertex: (2,-6) for the y-intercept, let x = 0 y = 3(-2)^...
June 1, 2016

@ Kaitland and Othilia - Algebra
The purpose of this webpage is not to facilitate cheating. You are in danger of being banned from using it.
June 1, 2016

mathhhhhh plz help immediately
is that X^3=36.31*10^-24 ? if so , just take the cube roots of that number. I get (36.31)^(1/3) * 10^-8 or appr 3.3114 * 10^-8
June 1, 2016

Math- Prob Stat
The absolutely perfect webpage for your question. Just plug in the values http://davidmlane.com/normal.html
June 1, 2016

math plz help ;-;
Is the top of the ice-cream a hemisphere? "On top of the cone is 18 as the bottom is 26. " This makes no sense to me. I need the radius of the cone, and the height of the cone. (The radius of the hemisphere is determined by the radius of the cone)
June 1, 2016

math plz help ;-;
Consider the following properties of a triangle 1. If a triangle has an obtuse angle, that angle must be opposite the largest side 2. A triangle can have at most one obtuse angle 3. If a triangle has sides a, b, and c, with c as the largest side, then if -- c^2 > a^2 + b^2...
June 1, 2016

stats
number of possible 5-digit pins = 3x3x3x3x3 = 243 prob(same) = 1/243
June 1, 2016

math plz help ;-;
slope is (-7-8)/(1+4) = -15/5 = -3 so y = -3x + b plug in one of your points, I picked (-4,8) : 8 = -3(-4) + b ---> b = -4 so y = -3x - 4 now, how easy was that?
June 1, 2016

Math - system of eqns
1 1 1 | 6 -1 -2 3 | 1 3 -4 4 | 5 1 1 1 | 6 0 -1 4 | 7 from: add #1 and #2 0 7 -1 | 13 from #3 x 1 - #3 1 1 1 | 6 0 -1 4 | 7 0 0 27| 62 from #2 x 7 + #3 1 1 1 6 0 1 -4 -7 switch signs 0 0 1 62/27 divide by 27 so x3 = 62/27 now back substitute x2 - 4(62/27) = -7 x2 = 248/27 -7...
June 1, 2016

math
let the times for the 3 subjects be 2x, 3x and x hrs each 2x+3x+x = 8 6x=8 x = 4/3 science : 2(4/3) = 8/3 hrs or 2 hrs and 40 minutes Math : 3(4/3) = 4 hours Lit : 4/3 hrs or 1 hour and 20 minutes check: 2:40 + 4:00 + 1:20 = 6:00
June 1, 2016

Radicals
not sure of your notation. does ^3 root -192 supposed to mean the cuberoot of -192 ? if so , (-192)^(1/3) = (-64)^(1/3) * (3^(1/3) = -4 (3)^(1/3) or -4 cuberoot (3) -6 exponent 3root 13 ?? = (-6)^3 √13 ???
May 31, 2016

Adding and subtracting mixed numbers
I would do it this way: (4 1/8 + 6 1/4) - 2 1/2 first of all, there is no need for the brackets in this case secondly, I change all my mixed fractions to workable fractions = 33/8 + 25/4 - 5/2 LCD is 8 = 33/8 + 50/8 - 20/8 = 63/8 or 7 7/8 mixed numbers are "nice" to ...
May 31, 2016

Algebra
First of all: you don't have an equation to solve are you simplifying? Your run-ons of "over" have to bracketed to establish priority e.g. is it ( (1+1/x)/x ) / (1/(x-1) ) or ( (1+1/x)/x ) / (1/x-1) ) or ...
May 31, 2016

math plz help ;-;
easiest way: for the y-intercept, let x = 0 , (can be done mentally) so -3y=12 ----- > y = -4 You are probably using the equation in the form y = mx +b, where b is the y-intercept, so change your given equation to that form 2x - 3y = 12 -3y = -2x + 12 divide by -3 y = (2/3)...
May 31, 2016

Maths (quadratic equation) need help
base ---- x height ---2x-3 area of triangle = (1/2) base x heigh (1/2)(x)(2x-3) = 10 carry on
May 31, 2016

Maths (quadratic equation) need help
using their hint: let the numerator of original fraction be x then the denominator is 2x+1 so the original fraction is x/(2x+1) condition stated: x/(2x+1) + 2 1/10 = (2x+1)/x x(2x+1) + 21/10 = (2x+1)/x multiply each term by 10x(2x+1) , the LCD 10x^2 + 21x(2x+1) = 10(2x+1)^2 ...
May 31, 2016

Math - Vectors
a) u = (-1, 2, -1) , v = (2, -1, 0) , w = (1, 1, -1) b) you want the cross-product of u and v, that is, a vector which is perpendicular to both u and v I don't know which method you have learned, but you should get (1, 2, 3) c) the normal to the triangle is (1,2,3) so the ...
May 31, 2016

Math - Year 10 - Probability
I can't solve the question, because there was no question.
May 31, 2016

math help
1,127.5 milligrams = 1.1275 grams ahhh, the beauty of the metric system !
May 31, 2016

maths
When I answered this question there was another solution after Steve's which has now been deleted. I only completed Steve's solution to correct that other posting.
May 31, 2016

maths
from Steve's ... 1/x + 1/y = 7/20 times 20xy, the LCD 20y + 20x = 7xy 20(y+x) = 7xy 20(14) = 7xy 40 = xy -----> y = 40/x plug into the first: x + 40/x = 14 x^2 + 40 - 14x = 0 (x-10)(x-4) = 0 x = 10 or x = 4 if x = 10, y = 40/10 = 4 if x = 4 , y = 40/4 = 10 the numbers ...
May 31, 2016

Math Calculus I
your f ' (x) is correct but not complete f ' (x) = (9*(cos^2(x)+sin^2(x)))/(3cos(x)+sin(x))^2 remember that sin^2 x + cos^2 x = 1 f '(x) = 9/(3cosx + sinx)^2 so when x = π/6 , f'(π/6) = 9/(3√3/2 + 1/2)^2 = appr .93769 this is the slope of the ...
May 30, 2016

math
Assuming you made your sketch, angle SOT + angle E = 180° , (since the angles at S and T are each 90° ) angle SOT + 78 = 180 angle SOT = 102° so the arc SOT = 102/360 of the circumference = 17/60 of the circumference
May 30, 2016

Math - volume about y axis
Makes no sense to me neither. f(x) = x^2 - 1 is a parabola opening upwards, so when we revolve it about the y-axis we have it open-ended above. We need a closed region to revolve. Did you mean the region below the x-axis ?
May 30, 2016

Algebra 1
length = 4x-3 Width = x-4 2W + 2L = perimeter 2(4x-3) + 2(x-4) = 84 8x - 6 + 2x - 8 = 84 10x = 98 x = 9.8
May 30, 2016

Trigonometry
sketch a right-angled triangle . since cosØ = 2/5 = x/r x^2 + y^2 = r^2 4 + y^2 = 25 y^2 = 21 x = ±√21 case 1: if x = +√21 cosØ = 2/5 , sinØ = √21/5 cos 2Ø = cos^2 Ø- sin^2 Ø = 4/25 - 21/25 = -17/25 case 2: if ...
May 30, 2016

Math..help
you should memorize the pattern for squaring a binomial: (a - b)^2 = a^2 - 2ab + b^2 so (3a - 7/9)^2 = 9a^2 - 42/9 a + 49/81 = 9a^2 - (14/3) a + 49/81
May 30, 2016

Math (Polar to Cartesian Equations)
secØ = r/x , cscØ = r/y so r^2 = 4(r/x)(r/y) r^2 = 4r^2/(xy) 1 = 4/(xy) xy = 4
May 30, 2016

math
just sub into the basic formula: amount = 400(1.07)^t
May 30, 2016

Math help!
#5 7^4/7^2____ 49 7^2 ______ 49 49 _____ 49 care to re-evaluate your answer? #6 –2r(8r + 5) = -16r^2 - 10r #7 correct #8. (2y – 3) (3y – 2) = 6y^2 - 4y - 9y + 6 = 6y^2 - 13y + 6 mmmmhhh, 1 out of 4 correct, somebody needs more studying and review.
May 30, 2016

math
arc cd=90° ?? this makes no sense, since arc length is measured in linear units , not degrees Are you saying that the arc cd subtends a 90° angle at the centre? If so, then r^2 + r^2 = 12^2 2r^2 = 144 r^2 = 72 r = 6√2 area of whole circle = 72π inches^2 area...
May 30, 2016

Math
correct
May 30, 2016

math
width --- x length --- x+4 solve for x x(x+4) = 117 hint: the quadratic factors nicely.
May 30, 2016

Math
Poorly worded question. Assuming her position is at the origin, and assuming by "path of ball" you mean the height of the ball, and assuming the net is at (20,10), and assuming the ball lands 5 ft beyond the net, we could have .... height = ax(x-25) subbing in (20,10...
May 30, 2016

algebra
300 ft/2.92 seconds = (300/5280) miles / (2.92/3600) hrs = (300/5280)(3600/2.92) mph = 70.05 mph = appr 70 mph
May 30, 2016

math
calculate the distance for different values of t e.g. t = 0, D(0) = -1.5(-8) + 9 = 21 t = 1, D(1) = 19.5 ... t = 5 , D)5) = 13.5 .. t = 8 , D(8) = 9 .. t = 12 , D(12) = 3 t = 15 , D(15) = -1.5 This question does not make any sense to me
May 30, 2016

maths
I don't understand your question. Please proofread and repost. Where does C suddenly come from ?
May 30, 2016

Math
L --- linear N --- non-linear xy = -9 --- N y = 3x --- L x + 7 = y --- L y = x - 4 --- L y = x^2 --- N x + y - 20 = 2x --- L 1/2x = y ---- L y = 5/x ---- N y = 30 - x^2 ---- N Did you notice why some are L and some are N ?
May 30, 2016

Math
Make a sketch to see that r = 5, h = 3 then s^2 = 5^2 + 3^2 = 34 slant height = √34 cm circumference of base of cone = 2π(5) = 10π cm This becomes the arc-length in a circle of circumference of 2π√34 let the angle of the sector be Ø arc = r&...
May 30, 2016

math plz help ;-;
Since both equations contain 2x, the easiest way would be elimination, thus subtract them: -4y = -2 y = -2/-4 = 1/2 sub into the first: 2x - 5(1/2) = -1 2x = 5/2-1 = 3/2 x = 3/4 ---------> x = 3/4 , y = 1/2 #2 y=(3/5_x-1 y=6/10x+3 ----> y = (3/5)x + 3 since you have two ...
May 30, 2016

math
(1.4*10^1)(8*10^4) = 11.2 * 10^5 = 1.12 * 10^6
May 29, 2016

Geometry
tan 43° = height/250 solve for "height"
May 29, 2016

CORRECTION - Maths , logarithms
#1 answer is incorrect 2^x * 6^x = log 14 14^x = log 14 now take logs of both sides, and use log rules x log14 = log(log14) x = log(log14)/log14 = appr .05168 it is easy to show that x = 1 is not a solution to the question since 14^1 ≠ log14 #2 2^2x+1 - (9)2^x = -4 the ...
May 29, 2016

Algebra
number of generals (student?) --- x , x ≥ 300 number of adults ----- y , y ≥ 500 ad cost = .5x + 1y , where .5x+y ≤ 400 profit = 6x + 9y - .5x - y = 5.5x + 8y The question cannot be answered e.g. If we allow the min of each x = 300, y = 500 profit = 5.5(300...
May 29, 2016

algebra
Just translate into math: shortest side --- x longest side ---- x+7 remaining side --- x+2 solve: x + x+7 + x+2 = 45
May 29, 2016

Math
(2/5)x + 15 = 27 solve for x
May 29, 2016

Math
let the 3 consecutive odds be n, n+2, and n+4 n+n+2+n+4=69 3n = 63 n = 21 They are 21, 23, and 25, with 23 as the prime one
May 29, 2016

Maths
I see a recursive formula: term(n) = term(n-1) + (n-1)^2 , for n > 1 , term(1) = 0 term(1) = 0 term(2) = 0 + 1^2 = 1 term(3) = 1 + 2^2 = 5 term(4) = 5 + 3^2 = 14 term(5) = 14 + 4^2 = 30 term(6) = 30 + 5^2 = 55
May 29, 2016

Math
average score of first three test is 90 ----> sum of those 3 tests was 270 average score of two test is 89 ---> sum of those 2 tests = 178 avg of 5 tests = (270 + 178)/5 = 89.6
May 28, 2016

Math
The volumes of two similar objects are proportional to the cube of their sides so vol1 : vol2 = 2.6^3 : 3.4^3 = 13^3 : 17^3 = 2197 : 4913 note: 2.6/3.4 = 26/34 = 13/17
May 28, 2016

algebra
If you meant: 7a^4 b , then the degree would be 5
May 28, 2016

Algebra
base ----- x cm height ---- 2x-4 cm area of triangle = (1/2) base x height (1/2)(x)(2x-4) = 48 x(2x-4) = 96 2x^2 - 8x - 96 = 0 x^2 - 4x - 48 = 0 (x-8)(x+6) = 0 x = 8 or x = -6, the latter is inadmissable base is 8 cm height is 12 cm
May 28, 2016

Maths
length of trail ---- x miles x/15 - x/20 = 8/60 times 60 , the LCD 4x - 3x = 8 x = 8 the trail is 8 miles long check: time at 20 mph = 8/20 hrs = 24 minutes time at 15 mph = 8/15 hrs = 32 minutes for a difference of 8 minutes
May 28, 2016

Calc
Because of summetry, we only need to look at the first quadrant Area of whole thing in quadrant I = ∫(16 - 4x^2) dx from 0 to 2 = [16x - (4/3)x^3] from 0 to 2 = 32 - (4/3)(8) - 0 = 64/3 So the area created by y = b must be 32/3 the intersection of y = b and y = 4x^2: 4x^...
May 27, 2016

Go with Steve - Calculus
My answer is gibberish I read it as area not volume, the irony is that I used to stress "Read the question carefully at least three times"
May 27, 2016

Calculus
Then you simply have area = ∫ (5 - 1/x) dx from 1 to 4 = [5x - lnx] from 1 to 4 take over after you found your answer , look at http://www.wolframalpha.com/input/?i=area+between+y+%3D+5+and+y+%3D+1%2Fx+from+1+to+4
May 27, 2016

Calculus
area = ∫ 1/x dx from 1 to 4 = [lnx] from 1 to 4 = ln4 - ln1 = ln4 - 0 = appr 1.3863 confirmation: http://www.wolframalpha.com/input/?i=%E2%88%AB+1%2Fx+dx+from+1+to+4 b) not sure about the y = 5 Are we rotating about y = 5 instead of the x-axis? Do we still have x = 1 to ...
May 27, 2016

math
do we know how many bottles in a case?
May 27, 2016

MATH - CALC
f(x) = x^3 - 3x^2 = x^2(x-3) You should be familiar with the general shape of y = 1x^3 + ..... yours crosses at x = 3 and since you have a double root at x = 0, it touches the x-axis at x = 0 find f'(x) and f''(x) , that should be easy when f'(x) is positive, ...
May 27, 2016

math
really? You are studying the above topic and you are asking this question? Sorry, but .....
May 26, 2016

math
"first term in an arithmetic sequence is 15" ---> a=15 "the tenth term is 69" ---> a+9d = 69 sub in a = 15 to find d then evaluate a + 3d
May 26, 2016

math
I will assume d is the diameter. so r = 4, h = 12 V = (1/3)π r^2 h plug in your values
May 26, 2016

Math
what is 1.35(29.50) ?
May 26, 2016

math
speed of plane without wind ---- x km/h speed of wind --------- y km/n 5600/(x-y) = 8 700/(x-y) = 1 x-y = 700 ** 9900/(x+y) = 9 1100/(x-y) = 1 x + y = 1100 *** add ** and *** to find x then sub back into **
May 26, 2016

math
Very very unsafe placement of a ladder.
May 26, 2016

Ratios math
cars : SUV's = 4:1 = 16:4 SUV's : Minivans = 4:5 now that I have a common "4" for the SUV's in both, I can say cars : SUV's : minivans = 16 : 4 : 5 or = 16x : 4x : 5x but 5x = 20 x = 4 so we have 64 cars, 16 SUV's , and 20 minivans for a total of ...
May 26, 2016

Math
Kiki, I found the 2.5 seconds for you in your previous post. Just sub that value into your equation. then do it again for t = 4 let me know what you got.
May 26, 2016

Math
what is C(5,2) x C(3,1) ?
May 26, 2016

Math
equivalent to finding the vertex of the parabola h = -16t^2 + 80t + 6 the t of the vertex is -b/(2a) = -80/-32 = 2.5 seconds
May 26, 2016

math
@ sad/jeo 6 almost identical questions without any work shown or indication where your problems are. Steve and I have answered 3 of them. Surely you can do the rest by following our methods.
May 26, 2016

math
if selling at 600 is a loss of 25%, the cost was .75x = 600 x = 800 so make a profit of 25% on the 800 , he should have sold at 800(1.25) = 1000
May 26, 2016

math
cost of first = 240/1.2 = 200 cost of 2nd = 240/.8 = 300 percentage change = (200+300)/480 = 1.04166.. he made a profit of appr 4.17%
May 26, 2016

precal
two numbers: x and y xy = 48 ---> y = 48/x and 1/x + 1/y = 1/3 (x+y)/(xy) = 1/3 (x+y)/48 = 1/3 x+y = 16 x + 48/x = 16 x^2 + 48 = 16x x^2 - 16x + 48 = 0 (x-12)(x-4) = 0 x = 12 or x = 4 if x = 12, y = 48/12 = 4 if x = 4, y = 48/4 = 12 The two numbers are 12 and 4
May 25, 2016

Pre-cal
cos^2 x = 3/4 cosx = ± √3/2 x = 30°, 150°, 210° or 330° in radians: π/6, 5π/6, 7π/6, 11π/6
May 25, 2016

Math
Your question is not clear at all. Are we first selecting the committees, then picking the president and vp ? number of committees = C(11,5) = 462 to pick a president , then vice president, order does matter, so 11x10 = 110 or P(11,2) if we are picking the pres and vpres from ...
May 25, 2016

algerba
the usual way to type a power is to use the ^ to show exponents, e.g. x^2 is "x squared" 0 = −2x^2 − 3x + 8 in standard form is 2x^2 + 3x - 8 = 0 so b^2 - 4ac = 9 - 4(2)(-8) = ...... 4(x + 2)^2 = 36 divide both sides by 4 (x+2)^2 = 9 x+2 = ±√...
May 25, 2016

Math/ ratios/ Fractions/ Singapore Math
Ross' total --- x Holly's amount = 60-x after spending: Holly has (3/4)(60-x) Ross has x-5 given: Holly/Ross = 1/2 (3/4)(60-x) / (x-5) = 1/2 45 - (3/4)x / (x-5) = 1/2 90 - (3/2)x = x - 5 180 - 3x = 2x - 10 190 = 5x x = 38 take over, using my definitions at the top
May 25, 2016

Math/ more ratios
let the number of pennies they have be 6x , 5x and 7x respectively 6x + 5x + 7x = 754 18x = 754 x = 41.88.. you are right, it makes no sense, it has to be a whole number. I suspect a typo in the question in your text or whatever your source.
May 25, 2016

correction - College Algebra
You cannot take log of individual terms, you have to take log of both sides. i.e. log (3^n + 9) = 69 but , why not just do this: 3^n = 60 now log both sides, and use log rules: n log3 = log60 n = log60/log2 = appr 3.727 check: 3^3.727 + 9 = 69.01100 , close enough to 69 if you...
May 25, 2016

math
amount of her money --- x after spending 2/7 of it, she has (5/7)x left then she spends (2/5) of that, or (2/5)(5/7)x total amount spent = (2/7)x + (10/35)x = (2/7)x + (2/7)x = (4/7)x so (3/7)x = 15 3x = 105 x = 35 <------ money she started with check: she spends (2/7)(35) ...
May 25, 2016

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