Wednesday

April 23, 2014

April 23, 2014

Number of results: 28,018

**calculus (derivativs)**

((x^2+25)(1)-(x)(2x))/(x^2+25)^2 = 0 Simplify (25-x^2)/(x^2+25)^2 = 0 As long as x^2+25 <> 0 then you can multiply both sides by the denominator (25-x^2) = 0 Thus x^2 = 25 x = ±5 ( Check: 25+25<>0 .. okay) Find y when x=-5 and x=+5. These are your points
*Tuesday, September 17, 2013 at 5:57pm by Graham*

**math**

convert to common denominator least commmon multiple of 5 and 25 is 25 so we want the fraction 3/5 to convert into the form x/25 so, 3/5 = x/25 we can cross multiply to get 5x = 25*3 x = 5*3 x= 15 So the fraction would be 15/25 Optional: adding 15/25 to 21/25 = 36/25 or 1 11/25
*Thursday, March 21, 2013 at 4:57pm by Knights*

**Maths**

j:r = 3:1, so j=3r (j+25)/(r+25) = 4/3 (3r+25)/(r+25) = 4/3 3(3r+25) = 4(r+25) 9r+75 = 4r+100 5r = 25 r = 5 so, John is 15 in 25 years, the two will be 40 and 30
*Friday, February 15, 2013 at 4:20am by Steve*

**Math**

Let's use the "brute force" method. Start at the top with the most valuable combination and start adding. 25 + 25 + 25 = 75 25 + 25 + 10 = 65 25 + 25 + 5 = 55 25 + 25 + 1 = 51 25 + 10 + 10 = 45 25 + 10 + 5 = 40 25 + 10 + 1 = 36 10 + 10 + 10 = 30 10 + 10 + 5 = 25 10 + 10 + 1 = ...
*Sunday, January 9, 2011 at 11:07am by drwls*

**in desperate need of help, PRECALC**

went 200 miles total averaging 50mph so took 4 hours total going: time = 100/x returning time = 100/y so 100/x + 100/y = 4 25/x + 25/y = 1 25 y + 25 x = xy xy - 25 y = 25 x y(x-25) = 25 x y = 25 x /(x-25) as x approaches 25, y becomes undefined, vertical asymptote
*Thursday, January 23, 2014 at 1:11am by Damon*

**physics**

first do the stopping problem d = Vi t + .5 a t^2 d = 25 t + .5 a t^2 50 = 25 t + .5 a t^2 v = Vi + a t 0 = 25 + at a t = -25 a = -25/t combine 50 = 25 t - .5(25t) 50 = .5 (25 t) t = 4 seconds to stop after applying brakes a = -25/4 while stopping Now do the problem for the ...
*Thursday, January 20, 2011 at 1:53am by Damon*

**math**

dy/dx = slope = [ (x+4)(2x) - x^2 ] /(x+4)^2 = ( x^2 + 8 x ] / (x+4)^2 at x = 1 this slope is = 9/25 so that is m goes through (1, 1/5) 1/5 = (9/25)(1) + b 5/25 = 9/25 + b b = -4/25 so y = 9 x/25 - 4/25 or 25 y = 9 x - 4
*Friday, March 8, 2013 at 10:27pm by Damon*

**Math/Radioactive Dating**

Sorry to re-enter the discussion at this point, but I just looked at the question again. It shows the ratio 1:3, so as Lena also noted the equation should then have been 1 = 4(1/2)^(t/1.25) 1/4 = (1/2)^(t/1.25) whether we take ln or logs does not matter we either get t/1.25 = ...
*Saturday, February 19, 2011 at 5:56pm by Reiny*

**Calculus**

I guess we are not allowed to cut this canvas up so the tent will be ten feet long and the opening at the end will be an equilateral triangle with slopes(hypotenuse of right triangle bounded by center pole h, slope, and ground g, of 5 ft. Maximize the area of that triangle A...
*Saturday, November 24, 2012 at 6:43pm by Damon*

**Calculus**

The McLaurin series expansion of that function about x=25 is f(x) = f(25) + (x-25)[f'(x) at x=25) f'(x) = (1/2)*x^(-1/2) f'(25) = (1/2)/5 = 1/10 Therefore f(x) = 5 + (x-25)/10 f(25.2) = 5+ .02 = 5.02 There is nothing wrong with your answer. The correct value is 5.01996016... ...
*Sunday, September 27, 2009 at 11:37pm by drwls*

**calculus**

The way you stated it, it would not be a closed region. I will assume it is also bounded by the y-axis, so we are looking at the right-angled triangle in quadrant II y = 5x + 25 x = (y-25)/5 x^2 = (y^2 - 50y + 625)/25 = y^2 /25 - 2y + 25 Rotating it about the y-axis V= π...
*Wednesday, May 2, 2012 at 12:15am by Reiny*

**math**

There are 25 chips. 7/25 of them are red and 6/25 are blue. The probability of what you described is (7/25)*(6/25) = 42/625
*Sunday, March 15, 2009 at 2:09am by drwls*

**math**

Original Amt. = $X. 1. Spent: $25. Bal. = (X-25). 2. Spent: (X-25)/2. Bal. = (X-25)/2. 3. Spent: (1/3)(X-25)/2 = (x-25)/6. Bal. = (X-25)/2 - (x-25)/6, Bal.=3(X-25)/6 - (X-25)/6 = 2(X-25)/6 = (X-25)/3. Bal. = (X-25)/3 = $60. (X-25)/3 = 60, Multiply both sides by 3: X - 25 = 180...
*Friday, August 19, 2011 at 3:44pm by Henry*

**chem**

Hg = glycolic acid Hg = 0.2M x 50 mL = 10 mmols. KOH = 5mL x 0.25M = 1.25 mmols. .......Hg + OH^- ==> g^- H2O I......10...0........0....0 added......1.25............ C...-1.25.-1.25.....1.25 E.....8.75..0.......1.25..1.25 Use the Henderson-Hasselbalch equation, substitute ...
*Friday, January 11, 2013 at 11:18am by DrBob222*

**math**

which expression below shows how much paul would collect in a week if he had 40 clients receiving daily plus sunday delivery,and 25 clients receiving sunday delivery only 1] 40[$2.25]+25[$1.00] 2] 40[$1.00]+25[$2.25] 3] 40[$1.25] +25[$2.25] 4] 65[$2.25] 5] not enough ...
*Thursday, November 15, 2012 at 9:39am by hudson*

**Math**

(9/4)*(25/25)=(9*25)/(4*25)=225/100=2.25 23=23*(25/25)=575/25 23 8/25=(575/25)+(8/25)=583/25 (583/25)*(4/4)=2332/100=23.32
*Monday, March 7, 2011 at 10:29pm by Anonymous*

**Math**

Here, no quadratics required, luckily. solving the second equation for y in terms of x y = (3/4) * x substituting into the first equation x^2 + y^2 = 25 yields x^2 + ( (3/4) * x)^2 = 25 x^2 + (9/16)*(x^2)=25 combining terms (25/16) * (x^2)= 25 x^2 = 25 * (16/25) x^2 = 16 x...
*Tuesday, October 2, 2007 at 10:38pm by Quidditch*

**math 8th grade**

25+25+25+25+25+28=128
*Thursday, March 31, 2011 at 5:37pm by sam*

**math**

Solve this pair of equations: x + y = 25 1/x + 1/y = 1/6 Rewrite as 1/x + 1/(25-x) = 1/6 [(25-x) + x]/[x(25-x)] = 1/6 150 = x(25-x) x^2 -25x + 150 = 0 (x-30)(x-5) = 0 One more step
*Tuesday, August 26, 2008 at 12:55am by drwls*

**math**

If adam is a now, then a - 1/2 = 12 a = 12 1/2 a + x/2 = 2x 12 1/2 + x/2 = 2x 25 + x = 4x x = 25/3 check: 25/6 + 25/2 = 25(2/3) = 2 * 25/3 25/2 + 75/3 = 100
*Saturday, March 29, 2014 at 8:42pm by Steve*

**math**

9 1/5 - 7 6/25 = 46/5 - 181/25 = 230 - 181/25 = 49/25 = 1 24/25 Now estimate to see if the answer is reasonable by rounding each mixed number to the nearest integer then subtracting.
*Friday, February 15, 2008 at 5:44pm by george*

**maths**

x+sqrt(x)=6/25 sqrt(x) = 6/25-x x=(6/25)^2 - 12x/25+x^2 rearrange to a quadratic 0=x^2-37x/25+36/625 now solve for x
*Monday, September 19, 2011 at 1:08am by Dr Russ*

**math**

2.)If f(x)=3x,g(x)=x-3,and h(x)= the square root of x, find (fogox)(X). I really didn't get this will someone please show me how to do it? This I what I did to solve for it: 3(x-3) 3(he square root of 25-3 3(5-3) 15-9=6 Ok here is another way I solved for it but I am still ...
*Saturday, April 6, 2013 at 6:52pm by Leo*

**math**

2.)If f(x)=3x,g(x)=x-3,and h(x)= the square root of x, find (fogox)(X). I really didn't get this will someone please show me how to do it? This I what I did to solve for it: 3(x-3) 3(he square root of 25-3 3(5-3) 15-9=6 Ok here is another way I solved for it but I am still ...
*Saturday, April 6, 2013 at 6:52pm by Leo*

**algebra**

paul charges $2.25 per week for daily plus sunday delivey, and $1.00 per week for sunday deliver only a:40[$2.25)+25($1.00) b:40($1.00)+25($2.25) C:40($1.25)+25($2.25) D:65($2.25)
*Friday, August 30, 2013 at 10:47am by kim *

**Precalculus**

x^2 + 25y^2 - 6x - 100y + 84 = 0 x^ - 6x + 9 + 25(y^2 - 4y + 4) = -84 + 9 + 100 notice in the y expression, I added 4 to the inside, but that was multiplied by 25, so I had to add 100 on the right side. (x-3)^2 + 25(y-2)^2 = 25 (x-3)^2/25 + (y-2)^2 = 1 so a^2 = 25, and b^2 = 1...
*Monday, November 23, 2009 at 11:21pm by Reiny*

**Complex Algaebra, Plz Help!!**

y = 25/(3x-2) find inverse x = 25/(3y-2) 3 x y - 2 x = 25 3 x y = (2x - 25) y = (2x-25)/3x f(x^2) = 25/(3x^2-2) c is not an equation, no = sign so no solution
*Wednesday, December 19, 2012 at 1:45pm by Damon*

**maths**

3^-3 * 6^2 * root 98 / 5^2 * cube root 1/25 * 15^-4/3 *3^1/3 = (1/27)*(36)*(7√2)/25 * (1/25)^(1/3) * (1/3)^(4/3) * (1/5)^(4/3) * 3(1/3) = (3/4) * 7√2/25) * (1/5)^(2/3) * (1/5)^(4/3) * (1/3)^(4/3) * 3^(1/3) = (3/4)(7√2/25) * ....... not working out at all ...
*Saturday, March 30, 2013 at 4:28am by Reiny*

**math**

Start inside the deepest parentheses: -1[-2(-3)^3]^2 = -1[-2(-27)]^2 = -1[54]^2 = -2916 -3{3-2{10-3(-2)^2}^2]^2 = -3{3-2{10-3*4}^2]^2 = -3{3-2{10-12}^2]^2 = -3{3-2{-2}^2]^2 = -3{3-2*4]^2 = -3{3-8]^2 = -3(-5)^2 = -3*25 = -75 -3[4-7(-3-5)]-(-5)^2 = -3[4-7(-8)]-25 = -3[4+56] - 25...
*Tuesday, September 27, 2011 at 7:26pm by Steve*

**Math**

T13 = a+12d = 61 T20 = a+19d = 82 so, T20-T13 = 7d = 21 d = 3 a = 25 S25 = 25/2 (25 + 25+24*3) = 25/2 (122) = 25*61 = 1525
*Saturday, December 17, 2011 at 12:46am by Steve*

**1st grade math**

25 cents 25 (with the cent sign -- a c with a line through it) $0.25 a quarter 25/100
*Thursday, April 8, 2010 at 4:58pm by Ms. Sue*

**Math**

Look carefully at the definition of "absolute value" and you should be able to answer your question. e.g |25| = 25 |-25| = 25
*Monday, January 28, 2013 at 7:44pm by Reiny*

**Calculus--complex numbers**

if a circle then of form (a-h)^2 + (b-k)^2 = R^2 center at (h,k) here (a-.5)^2 + (b-.5)^2 = ???? a^2 -a +.25 +b^2 -b +.25 = ??? BUT a^2-a +b^2-b = 0 step 3 so .25 + .25 = .5 .5 = R^2 = 1/2 so R = 1/sqrt 2
*Wednesday, March 12, 2008 at 4:09am by Damon*

**physics**

balance the torques. 62(25) + 76(25-2) = 96(25) + x(25-2.5) Now just solve for x
*Monday, January 20, 2014 at 1:09am by Steve@Math*

**Integrated Math 1**

Suppose a parabola f(x) has its vertex at (0, 25) and its zeros at x = -5 and x = 5. Then f(x)equals _____. A. 25-x^2 B. 1- 1/25 x^2 C. x^2-1 D. x^2-25
*Wednesday, July 11, 2012 at 11:17am by Tifini*

**Math**

You probably know what 1/5 of 25 is Hint: 25/5 So, double that to get 2/5 of 25. Or, just multiply fractions: 2/5 * 25/1 = 50/5 = ?
*Wednesday, August 28, 2013 at 4:12pm by Steve*

**Math**

(3/5)25 = (5/5)x 3/5x = 25 x = 25 / 3/5 x = 25 * (5/3) x = 125 / 3 x = 41.67 or about 42 minutes
*Wednesday, November 13, 2013 at 6:40pm by Ms. Sue*

**math**

(x+5)(x+5) Foil x^2 + 5 x + 5 x + 25 = x^2 + 10 x + 25 or use distributive property x(x+5) + 5(x+5) = x^2 + 5 x + 5 x + 25 = x^2+10x+25 again
*Monday, February 10, 2014 at 3:18pm by Damon*

**Math**

c = m p + b 50 = m (1) + b 25 = m(2) + b ------------- subtract 25 = - m m = -25 the slope then 25 = -25 (2) + b 75 = b the intercept with cup axis so c = -25 p + 75 so if I charged nothing, I would give away 75 cups and if I charged three, I would sell none :)
*Monday, January 19, 2009 at 11:36am by Damon*

**Finance**

25 * 0.17 = 4.25 25 - 4.25 - 2.50 = $18.25
*Sunday, June 24, 2012 at 5:44pm by Ms. Sue*

**Algebra; HELP PLEASE.**

well, let's see if y = a^x if x = 2, y = 1/25 so 1/25 = a^2 1/5 = a so try y = (1/5)^x test x = -2 y = (1/5)^-2 y = (1)/(1/5)^2 = 1/(1/25) = 25 that sure is promising
*Thursday, February 2, 2012 at 6:54pm by Damon*

**maths, variations checking!**

Your expression for y is incorrect, try this instead... A) y is inversely proportional to (x-1) if there exists a non-zero constant k such that y = k/(x-1). B) Given that when y=5 x=3, we can solve for k in y = k/(x-1) as follows: 5 = k/(3-1) 5 = k/2 5(2) = k [cross multiply] ...
*Tuesday, December 18, 2007 at 5:57am by Cathy*

**physics**

ok, just use -4 instead of -40' v = Vo + a t Vo = 25 m/s when the thing stops, v = 0 so time to stop 0 = 25 + a t NOW we have a = -4 0 = 25 -4 t 4 = 25/4 = 6.25 seconds to stop after the brakes are applied
*Saturday, July 19, 2008 at 2:44pm by Damon*

**Math**

b/g = 3/5 (b+5)/(g+3) = 5/7 b = 3g/5 (3g/5 + 5)/(g+3) = 5/7 (3g+25)/(g+3) = 25/7 7(3g+25) = 25(g+3) 21g + 175 = 25g + 75 4g = 100 g = 25 so, b=15 15/25 = 3/5 20/28 = 5/7
*Saturday, February 11, 2012 at 1:08am by Steve*

**Math**

1. are you saying .... If v = (-5, -3), then find -5 ||v||^2 ?? |v| = ≤((-5)^2 + (-3)^2) = √34 so -5 |v|^2 = -5(34) = - 170 2. V = -25j = 0i - 25y = (0, -25) so |V| = 25 so a unit vector in the same direction of V is (0/25, -25,25) = (0, -1) 3. obviously true by ...
*Saturday, June 8, 2013 at 10:44pm by Reiny*

**Integrated Math 1**

The standard equation of a parabola is : y = a x ^ 2 + bx + c The vertex of a parabola is the point where the parabola crosses its axis. If the coefficient of the x ^ 2 term is positive, the vertex will be the lowest point on the graph, the point at the bottom of the “U”-shape...
*Wednesday, July 11, 2012 at 11:17am by Bosnian*

**chemistry**

Keq = [0.25 - x] / [0.25 - x][2x] = [0.25 - ] / [0.25 - ][2()] = What numbers need to be substituted?
*Thursday, April 3, 2008 at 12:04pm by Claus*

**chemistry**

Keq = [0.25 - x] / [0.25 - x][2x] = [0.25 - ] / [0.25 - ][2()] = What numbers need to be substituted?
*Thursday, April 3, 2008 at 12:04pm by Claus*

**chemistry**

Keq = [0.25 - x] / [0.25 - x][2x] = [0.25 - ] / [0.25 - ][2()] = What numbers need to be substituted?
*Thursday, April 3, 2008 at 12:04pm by Claus*

**chemistry**

Keq = [0.25 - x] / [0.25 - x][2x] = [0.25 - ] / [0.25 - ][2()] = What numbers need to be substituted
*Thursday, April 3, 2008 at 8:52pm by Claus*

**math**

(100-25)x2+25 75x2+25 150+25=175
*Tuesday, September 14, 2010 at 5:02pm by AnOnYmOuS1*

**math**

I assume you want to simplify. 5^2 = 25 25 - 25/s^2 - 25 = 25(1-1/s^2-1) = 25(-1/s^2)
*Monday, February 25, 2013 at 9:48pm by PsyDAG*

**pre calc**

It is not clear what your x means, and where you came up with 10x + 40 for the value of the dimes. Let the numbers of nickels, dimes and quarters be N, D and Q. 5 N + 10 D + 25 Q = 320 D = N + 4 N + D + Q = 25 Now solve those three equations in three unknowns. 5 N + 10(N + 4...
*Friday, September 26, 2008 at 10:27pm by drwls*

**math HELP**

When the ball hits the ground height be zero. 25 t - 16 t ^ 2 = 0 t ( 25 - 16 t ) = 0 This equation will be zero when t = 0 OR 25 - 16 t = 0 25 - 16 t = 0 Add 16 to both sides 25 - 16 t + 16 t = 0 + 16 t 25 = 16 t Divide both sides by 16 25 / 16 = t t = 25 / 16 When t = 0 ball...
*Tuesday, May 8, 2012 at 5:41am by Bosnian*

**maths**

Since x increased by 9 when y decreased by 1, when y decreases 2 more to 0, x will increase 18 more, to 25. algebraically, the slope is -1/9, so y = -1/9 x + c since (7,2) is on the line, 2 = -7/9 + c c = 25/9 y = -1/9 x + 25/9 when y=0, -1/9 x + 25/9 = 0 x = 25
*Friday, August 30, 2013 at 1:48am by Steve*

**algebra2**

percent notations are different ways of showing a fraction for example: Example 1: Write the three percent notations for 25%. 1: ratio = 25/100 2: fractional = 25%=25 X 1/100 3: decimal 25% = 25 x .01
*Friday, June 4, 2010 at 4:15am by Jennifer*

**calculus**

volume of ellipsoid of semi-axes a,b,c is 4/3 pi * a*b*c your ellipse is 5y = 3sqrt(25-x^2) 25y^2 = 9(25-x^2) 9x^2 + 25y^2 = 9*25 x^2/25 + y^2/9 = 1 so semi-axes are 5 and 3 rotate around the x-axis gives a third semi-axis of 3 (y-height) volume is 4/3 * 5*3*3 pi = 60pi...
*Saturday, March 3, 2012 at 5:07am by Steve*

**math**

4% = 1.25 so 100% = 1.25/4*100 = 31.25 Meal = 31.25 tax = 1.25 tip = 6.25 total = .....
*Saturday, April 26, 2008 at 9:51am by Reiny*

**Correction - Math**

(2/25 +13/25) - (2/5 - 14/15) = 15/25 - (-4/25) = (15+4)/25 = 19/25
*Monday, July 8, 2013 at 1:56pm by Reiny*

**math**

-5(2w+1)=25 remove the parentheses. -10w-5 = 25 add 5 to both sides. -10w-5+5 = 25+5 combine terms -10w = 30 multiply both sides by -1 10w = -30 divide both sides by 10 10w/10 = -30/10 w = -3 Check it by substituting -3 into the original equation. -5(2w+1) = 25 -5(2*-3 + 1) = ...
*Tuesday, September 23, 2008 at 5:45pm by DrBob222*

**algebra**

since every 25 years the population grows by a factor of 3, P(y) = 180*3^(y/25) 2(180) = 180*3(y/25) 2 = 3^(y/25) ln2 = y/25 ln3 y = 25*ln2/ln3 = 15.77
*Wednesday, April 4, 2012 at 4:56pm by Steve*

**probability**

This is a case of binomial distribution Prob(watching) = .68/100 = 17/25 prob(not watching) = 8/25 a) Prob(exactly 6 out of 12 watching) =C(12,6)(17/25)^6(8/25)^6 = .... b) prob(6 or less) = Prob(exactly 1) + Prob(exacly 2) + prob(exactly 3) + .. prob(exactly 6) = C(12,1)(17/...
*Thursday, October 14, 2010 at 1:11am by Reiny*

**Complex Algaebra, Plz Help!!**

25/(3x^2-2) = 2/(x-1) 25(x-1) = 6 x^2 - 4 25 x - 25 = 6 x^2 - 4 6x^2 -25 x +21 = 0 (6x-7)(x-3) = 0 x = 3 or 7/6
*Wednesday, December 19, 2012 at 1:45pm by Damon*

**math**

complete the square to find the centre x^2 -10x + 25 + y^2 = k + 25 (x-5)^2 + y^2= k+25 so the centre must be (5,0), which lies on the x-axis to be tangent to the y-axis it must pass through (0.0) and its radius must be 5 so the equation must be (x-5)^2 + y^2 = 25 and k+25 ...
*Sunday, February 23, 2014 at 9:28pm by Reiny*

**Math ms.Sue**

what is -a^-2 if a=-5? A.)-25 B.)25 C.)-1/25 D.)1/25 I think it is D. Please help.
*Wednesday, January 9, 2013 at 2:29pm by Deborah*

**business calculus**

dy/dx = (-5/2)x^(-1/2) + (3/2)x^(1/2) = -5/(2√x) + 3√x/2 when x = 25 y = -5(√25) + (√25)^3 = -25 + 125 = 100 dy/dx = -5/(2√25) + 3√25/2 = -1/2 + 15/2 = 7 then (y-100) = 7(x-25) Finish it up to express the final equation is the form you want.
*Tuesday, April 5, 2011 at 1:03pm by Reiny*

**pre cal**

let sin^-1 (3/5) = Ø then sinØ = 3/5 and cosØ = 4/5 so you want tan 2Ø = sin2Ø/cos2Ø = 2sinØcosØ/(2cos^2Ø - 1) = 2(3/5)(4/5)/(32/25 - 1) =(24/25) / (7/25) = (24/25)(25/7) = 24/7
*Tuesday, November 2, 2010 at 10:56pm by Reiny*

**mercer**

plzz help with this. 15. The scale of a map is 1 inch = 25 miles. How many miles does 1.25 inches represent? (1 point) 25 miles 31.25 miles 62.5 miles 49.25 miles
*Wednesday, December 18, 2013 at 12:29am by josh *

**precalc**

25(x^2 + 10x) - 36(y^2 + 16y) = 2579 Complete the squares: 25(x^2 + 10x + 25) - 25*25 - 36(y^2 + 16y + 64) + 36*64 = 2579 25(x+5)^2 - 36(y+8)^2 = 900 How convenient . . . (x+5)^2/36 - (y+8)^2/25 = 1 Looks like an hyperbola with center at (-5,-8) and horizontal transverse axis ...
*Friday, December 16, 2011 at 4:40pm by Steve*

**Math**

A circle with the equation (x+3)squared plus (y-2)squared = 25 is reflected over the line x=2. What is the equation of the image? (x-3)^2 + (y+2)^2=25 (x-7)^2 + (y+2)^2=25 (x-7)^2 + (y-7)^2=25 (x-3)^2 + (y-2)^2=25
*Friday, January 20, 2012 at 9:06am by Callie*

**Algebra**

I don't understand. Didn't you post the formula with a +/- ? so in your equation x^2 - 25 = 0 a = 1 b = 0 c = -25 so x = (0 ±√(0-4(1)(-25))/2 = ±√100 / 2 = ±10/2 = ±5 of course the easier way would be to write the equation as x^2 = 25 , then x = ±√25 = ±5
*Thursday, June 12, 2008 at 12:25pm by Reiny*

**Physics**

X = 40-15 = 25 cm. Y = 25 cm. tanA = Y/X = 25/25 = 1.00 A = 45o. = Direction. Mag. = X / cos45 = 25/cos45 = 35.36 cm.
*Saturday, November 3, 2012 at 1:56pm by Henry*

**geometry!**

Did you notice that 25^2 = 24^2+7^2 ? so angle APB = 90° sin(angle BAP) = 7/25 So cos(angle DAP) = 7/25 , properties of complementary angles, since angle A = 90° by the cosine law: PD^2 = 25^2 + 24^ - 2(25)(24)cos DAP = 625 + 576 - 2(25)(24)(7/25) = 1201 - 336 = 865
*Monday, March 11, 2013 at 4:13am by Reiny*

**calculus**

a. When x = sqrt ( 5 ) f ( x ) = 10 x ^ 2 / ( x ^ 4 + 25 ) = 10 * sqrt ( 5 ) ^ 2 / ( sqrt ( 5 ) ^ 4 + 25 ) = 10 * 5 / ( 25 + 25 ) = 50 / 50 = 1 yes b. When x = 3 f ( x ) = 10 x ^ 2 / ( x ^ 4 + 25 ) = 10 x ^ 2 / ( x ^ 4 + 25 ) = 10 * 3 ^ 2 ( 3 ^ 4 + 25 ) = 10 * 9 / ( 81 + 25...
*Sunday, December 16, 2012 at 9:48am by Bosnian*

**Physics**

LOL, do it backwards F = net force on each link so force on bottom link = F = m a F = .1 * 2.5 = .25 N on link 5 that is the answer to part f NOW, net one up, link 4, also has net force of .25 N so force up -.25 = m a = .25 so .25 more = .50N on link 4 In fact the net force on...
*Saturday, March 19, 2011 at 8:54pm by Damon*

**Algebra II**

Write 36x^2-360x-25y^2-100y=100 in standard form. Then state whether the graphs of the equation is a parabola, circle, ellipse, or hyperbola. I started with: 36(x^2 -10x+25)-25(y^2+4y+4)=100+36(25)-25(4) which leads to: 36(x^2-10x+25)/900 - 25(y^2+4y+4)/900=1 Simplified to: (x...
*Saturday, March 1, 2008 at 5:50pm by Lucy*

**Geometry**

first of all: 6'3" = 6 1/4 feet = 25/4 feet now set up a ratio 1"/2' = x"/(25/4)' cross multiply (the units are the same, so we can drop them) 2x = 25/4 x = 25/8 so the scale for the length is 25/8 " or 3 1/8 inches now do the same for the width
*Thursday, February 19, 2009 at 1:47pm by Reiny*

**physics**

Measure of two quantities along with the precision of respective measuring instrument is A = 2.5 m s–1 ± 0.5 m s–1 B = 0.10 s ± 0.01 s The value of A B will be (a) (0.25 ± 0.08) m (b) (0.25 ± 0.5) m (c) (0.25 ± 0.05) m (d) (0.25 ± 0.135) m please tell me the correct answer and...
*Thursday, August 16, 2012 at 9:41am by help me out it's urgent*

**CALC**

You're right Adam, just plug -1.25 to find X3. So...you know... y=x^3+x+3 y'=3x^2+1 Xn=-1 The equation you use is: Xn+1 = Xn- (f(Xn)/f'(Xn)) So for: X2=(-1)- ( ((-1)^3+(-1)+3)/ (3(-1)^2+1)) X2= (-1)- (1/4) X2= -1.25 Then... X3=(-1.25)- ( ((-1.25)^3+(-1.25)+3)/ (3(-1.25)^2+1)) ...
*Saturday, May 29, 2010 at 8:36pm by gurbz*

**math**

Let x be the number of ml of the 5% solution and y be the number of moles of the 9% solution. 0.09 * 25 = 0.05*x + 0.15y (alcohol content) x + y = 25 (total volume) Substitute 25-x for y in the first equation and solve for x. 2.25 = 0.05 x + 0.15(25-x) = 3.75 -0.10x etc.
*Monday, October 29, 2007 at 9:13pm by drwls*

**Calculus**

25(x-3) = 25 x -75 so [ 25 x -75 - x^2 - 4 x - 4 ] /(x-3) [-x^2 + 21 x -79 ] / (x-3) (x-3) is not a factor of the numerator so I can not get rid of it in the denominator. as x goes to 3 the numerator becomes -25 and the denominato is 0 so undefined is the answer. If you ...
*Saturday, February 25, 2012 at 11:58am by Damon*

**calculus**

Find cos(2,è),csc è = è lies in quadrant II I didn't have a theta sign so I used q -7/25 24/25 7/25 -24/25
*Monday, November 26, 2007 at 11:59am by kelly*

**algebra**

Eq1: X^2 + 4Y^2 = 25. Eq2: Y^2 - X = 1. Y^2 = X + 1. In Eq1, substitute X+1 for Y^2: X^2 + 4(X+1) = 25, X^2 + 4X + 4 = 25, (X+2)^2 = 25, Take sqrt of both sides: X+2 = +-5, X = X = 5-2 = 3. X = -5-2 = -7. Solution set: (3,+-2), (-7,+-sqrt6i).
*Wednesday, April 20, 2011 at 11:06am by Henry*

**math**

Simple! You must have learned that for similar triangles the corresponding sides are in the same ratio, so x/11.25 = 2.7/1.25 x = (2.7/1.25)(11.25) = 24.3
*Thursday, January 5, 2012 at 12:22pm by Reiny*

**Accounting**

a) unit margin = 80-55 =25 break-even = 740000/25 = 29600 units b) (740000+140000)/25 = 880000/25 = 35200
*Sunday, July 14, 2013 at 5:46pm by Chol*

**VNS,Math**

#1: If the price is x, then we must have 50*60 + 25*56 + 25x = 58(50+25+25) #2: (6*25-45)/5 #3: (90+2*84)/3
*Friday, October 4, 2013 at 4:11am by Steve*

**algebra**

Newton's method. Estimate the square root. Divide the estimate into the original number. Then look at the result. If it is higher than the estimate, go half way of the difference an repeat. Example: sqrt 25 estimate:4 25/4=6.25 half way between 4 and 6.25 is 5.13 25/5.13=4.87 ...
*Tuesday, July 6, 2010 at 3:45pm by bobpursley*

**AP Calculus**

a continuous function f has domain (1,25) and range (3,30). if f'(x) is less than 0 for all x between 1 and 25, what is f(25)? a)1 b)3 c)25 d)30 e)impossible to determine from the information given
*Tuesday, December 14, 2010 at 9:21pm by Stanley*

**math**

Divide 2 2/5 ÷ 2 2/4 Write the answer in simplest form Choose the best answer from the options below: A 24/25 B 23/25 C 22/25 D 21/25
*Friday, May 20, 2011 at 12:28am by anette*

**math**

25 * .65 = 16.25 25 * 0.65 * 0.2 = 3.25 but I do not believe that 0.2. I think you have the loss 80% when it should be like 20%
*Sunday, March 30, 2014 at 9:02pm by Damon*

**Calculus**

You are almost right but since u=-t^(2) the limits are [0,-25] then put them into e^(u) and you get, e^(-25)-e^(0)= e^(-25)-1 Then divide that answer by 5 thus the answer is, (e^(-25)-1)/5
*Thursday, October 29, 2009 at 9:07pm by Collin*

**pre-calc**

h(x)=-0.5x^2+1.25x+3 h(2) = 3.5 3.25 = -0.5x^2+1.25x+3 -0.5x^2+1.25x-.25 = 0 x = .22 (going up) or 2.28 (coming down) a parabola reaches its vertex when x = -b/2a = -1.25/-1 = 1.25 h(1.25) = 3.781
*Thursday, November 10, 2011 at 8:10pm by Steve*

**Physics**

Start counting time when the apple is thrown. The distance it falls is D1 = (g/2)t^2 = 4.9 t^2 For the orange, for t>1.25 s, D2 = 28(t-1.25) + 4.9(t-1.25)^2 Set D1 = D2 and solve for t when they are both at the same distance (ground level). 4.9t^2 = 28(t-1.25) + 4.9(t-1.25...
*Saturday, February 2, 2013 at 6:46pm by drwls*

**Trigonometry**

A right triangle with sides of 7 and 24 has a hypotenuse of 25. The cosine of arctan 7/24 is 24/25 and the sine is 7/25. Now use the formula cos2A = cos^2A - sin^A to arrive at cos(2arctan(7/24)) = (24/25)^2 - (7/25)^2 = 527/625
*Wednesday, November 12, 2008 at 6:44pm by drwls*

**mercer**

no, (3/8)/3 = 1/8 Consider 1/8 as a unit. You start with 3 of them, and then take 1/3 of that, leaving 1 unit (1/8) 1.25 in represents 1.25*25 = 31.25 miles
*Wednesday, December 18, 2013 at 12:29am by Steve*

**Math**

I recognize the formula for the area of a trapezoid where a and b are the two parallel sides and h is the height between them, so just plug in the values. I will do the first a. A = (1/2)(25)(15+42) = (1/2)(25)(57) = 1425/2 or 712.5 square units do the others the same way, ...
*Tuesday, May 25, 2010 at 6:30pm by Reiny*

**math**

First, multiply both the numerator (top) and denominator (bottom) by the equivalent of 1 to eliminate i in the denominator: (5 - 9i)(5 - 2i) ---------------- (5 + 2i)(5 - 2i) 25 - 55i + 18i^2 ---------------- 25 - 4i^2 Remember that i^2 = -1 25 - 55i + 18(-1...
*Monday, April 30, 2012 at 10:31pm by MathGuru*

**Ladakh alchi institute Maths**

25(2) 25(1) 25(4) so 25
*Tuesday, December 25, 2012 at 2:28am by Damon*

**Statistics**

a. C(25,4) = P(25,4)/4! b. P(25,4) = 25*24*23*22
*Tuesday, June 11, 2013 at 1:45pm by Steve*

**business math**

day shift 40 * 8.25 overtime 58-6 -40 = 12 *1.5*8.25 midnight shift 6* 2 * 8.25 so 8.25 (40 + 18 + 12) = 67*8.25 = 552.75 pass higher minimum wage !!!!
*Saturday, March 8, 2014 at 9:48am by Damon*

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