Sunday

February 26, 2017
Total # Posts: 1,815

**Solving a system of linear Equations using Substit**

x = number of newsletter copies 0.90x = cost for mailing & printing 600 = cost for research & writing 0.90x + 600 = total cost for publishing newsletter 1.50x = total from selling newsletter 0.90x + 600 = 1.50x 0.6x = 600 x = 1000 newsletters to break-even

*February 22, 2011*

**Math**

In 2001, aver. price of an acre = $1132 In 2006, aver. price of an acre = $1657 a. 2001 = 0, 1132; 2006 = 5, 1657 2001 would be the starting year and 2006 would be 5 years later The ordered pairs would be, (0,1132), (5,1657) b. slope m = y2 - y1/(x2 - x1) m = 1657 - 1132/(5 - ...

*February 22, 2011*

**Calc**

4x - x^2 -(x^2 - 4x) x^2 - 4x = 0 x^2 - 4x + 4 = 0 + 4 (x - 2)^2 = 4 (x - 2)^2 - 4 -(x - 2)^2 + 4 4 - (x - 2)^2 | = integral sign | 1/(sqrt(4 - (x - 2)^2) dx u = ( x - 2) du = dx | 1/(sqrt(4 - u^2)) du = arcsin u/2 + C = arcsin (x - 2)/2 + C

*February 22, 2011*

**math**

n = the number n - 2 = subtract 2 from the number 2(n - 2) = double the difference 2(n - 2) + 7 = then add 7 2(n - 2) + 7 = 57 2n - 4 + 7 = 57 2n + 3 = 57 2n = 54 n = 27 The number is 27

*February 22, 2011*

**math--Unclear problem**

Your problem is not clear. 8 __ 72 __ 2 __ What does the ___ mean ?

*February 22, 2011*

**Algebra II**

2y - 1 = 3x - y/5 3x - 4/8 = y/4 First, simplify both equations 2y - 1 = 3x - y/5 Multiply both sides by 5 10y - 5 = 15x - y 11y - 15x = 5 3x - 4/8 = y/4 Multiply both sides by 8 24x - 4 = 2y -2y + 24x = 4 Multiply by 2 (11y - 15x = 5) Multiply by 11 (-2y + 24x = 4) 22y - 30x...

*February 22, 2011*

**Math**

Solve without graphing first so that you know what x and y equal. Then pick three points for each to graph. 3x + y = 6 x = 1, y = 3 x = 2, y = 0 x = 3, y = -3 2x + 3y = 13 x = 1, y = 11/3 = 3.67 (3.67 is a little more than 3 1/2) x = 2, y = 3 x = 3, y = 7/3 = 2.34 (2.34 is a ...

*February 22, 2011*

**Math**

I = PRT This is a formula for calculating simple interest. Interest = Principal * Rate * Time Example, you put $500 in a saving account, at 3% interest per year. To find the interest after two years, P = $500, R = 0.03, T = 2 I = 500 * 0.03 * 2 I = 1000 * 0.03 I = $30

*February 22, 2011*

**Algebra**

-3x + 2y = 8 x + 4y = -4 x + 4y = -4 x = -4 - 4y Substitute, x = -4 - 4y in, -3x + 2y = 8 -3(-4 - 4y) + 2y = 8 12 + 12y + 2y = 8 14y = -4 y = -4/14 y = -2/7 Substitute, y = -2/7 in either equation to find x. Then check your solutions in the original equations.

*February 22, 2011*

**Algebra 2**

R = 238.39x - 0.5x^2 x = 154 154^2 = 154 * 154 = 23716 R = 238.39(154) - -0.5(154)^2 R = 36,712.06 - 0.5(23716) R = 36,712.06 - 11,858.00 R = ?

*February 22, 2011*

**Math**

x = number of days to operate NJ y = number of days to operate OH z = number of days to operate GA 10x + 70y + 60z = 2150 (Handbags) 20x + 50y + 80z = 2300 (Shoes) 40x + 30y + 90z = 2500 (Belts) Solve for x, y, and z simultaneously If you want, post back with your answer and I...

*February 22, 2011*

**Math**

If your equation is, (5x - 2 + 3)/(x - 8) = 0 Multiply both sides by x - 8 5x + 1 = 0 5x = -1 x = -1/5

*February 22, 2011*

**math-No question**

What is your question?

*February 22, 2011*

**Math**

x = amt invested at 0.10 y = amt invested at 0.15 0.10x + 0.15y = 1440 x + y = 12000 Solve for x and y simultaneously If you are correct, x = $7,200 y = $4,800

*February 22, 2011*

**arithmetic**

(e²-2e+7)-(e²+2e+7) e² - 2e + 7 - e² - 2e -7 -4e^2

*February 22, 2011*

**Calculus**

v(t)= h(4t+h)/ h = 4t This should be, v(t)= 2h(2t + h)/h = 2(2t + h) = 4t + 2h v(t) = (2(t + h)^2 + 4 - (2t^2 + 4))/h v(t)=(2t^2 + 4ht + 2h^2 + 4 - 2t^2 - 4)/h v(t) = (4ht + 2h^2)/h v(t) = 2h(2t + h)/h v(t) = 2(2t + h) v(t) = 4t + 2h Then, lim h-->0 v(t) = 4t + 2h v(t) = 4t...

*February 22, 2011*

**math**

If you mean, y = 2x + 2, point (2,3) Parallel lines have the same slope. The slope-intercept equation form is, y = mx + b Slope = m and y-intercept = b y = 2x + 2 Slope m = 2 Therefore the parallel line has slope m = 2 y = 2x + b To find b, use the point (2,3). Substitute the ...

*February 22, 2011*

**College Algebra**

6 crates by 8 am 24 crates by 11 am Aver rate of change = change in crates packed/change in time Aver rate of change = (24 - 6)/(11 - 8) Aver rate of change = 18/3 = 6 crates/hr

*February 22, 2011*

**trig**

x^2 + y^2 = 49 r^2 = 49 r = 7 Arc length A = angle in rads * r To convert 30 deg to radians 30 deg * pi/180 = 30pi/180 = pi/6 A = pi/6 * 7 A = 7pi/6

*February 22, 2011*

**math**

x = amt invested at 0.07 y = amt invested at 0.12 0.07x + 0.12y = 215 x + y = 2000 Solve simultaneously for x and y

*February 21, 2011*

**math**

Area A = pi r^2 radius, r = 1/2 d pi = 3.14 1. d = 42, r = 1/2 d = 1/2 42 = 21 A = pi r^2 A = (3.14)(21^2) A = (3.14)(441) A = 1384.74 Do the 2nd problem the same as above.

*February 21, 2011*

**math please help**

First, reduce 6/4 6/4 = 3/2 For example, dividing 6 by 2/3 is the same as multiplying 6 by the reciprocal of 2/3. 6/(2/3) = 6 * 3/2 = 18/2 = 9 So, multiplying 6 by 3/2 is the same as dividing by 6 by the reciprocal of 3/2. 6 * 3/2 = 6/(2/3) = 18/2 = 9 Neither of your answers, ...

*February 21, 2011*

**algebra**

Amount spent, x, should be greater than or equal to $6,000 but less than or equal to $10,000. 6,000 <= x <= 10,000

*February 21, 2011*

**pre algebra**

10(-2x + 1) = 19(x + 1) Distribute the 10 and 19 -20x + 10 = 19x + 19 Combine terms -39x = 9 Solve for x x = - 9/39 = -3/13

*February 21, 2011*

**MATH**

Girls : Boys = 3 : 2 3x = girls 2x = boys 3x + 2x = 25 5x = 25 x = 5 Girls = 3x = 3(5) = 15 Boys = 2x = 2(5) = 10 How many more girls are there than boys?

*February 21, 2011*

**maths-Claire, please check problem**

ãx(8-x) ? Please edit your problem.

*February 21, 2011*

**math**

http://www.google.com/#hl=en&sugexp=ldymls&xhr=t&q=5000^5&cp=5&pf=p&sclient=psy&aq=0&aqi=&aql=&oq=5000^5&pbx=1&bav=on.1,or.&fp=5e2b21bd614e0a97

*February 21, 2011*

**Geometry-7th grade**

All sides of a Rhombus are congruent. Therefore, AB = BC = CD = AD BC = x + 9 DC = 5x - 2 BC = DC x + 9 = 5x - 2 4x = 11 x = ?

*February 21, 2011*

**Geometry**

This is an example of how this problem is done. Gilt?- none of the definitions I found had anything to do with measurement Draw a triangle ABC, side a = opposite side side b = adjacent side side c = hypotenuse You are given, side c = length of ramp = 14 side a = wheelchair ...

*February 21, 2011*

**Algebra 1**

Do you need to find L2? If two lines are perpendicular, the slope m of one is the negative reciprocal of the slope of the other, Slope m1 * m2 = -1 or, slope m2 = -1/m1 Your need to find slope m1 to write the equation of the perpendicular line. L1 = 3x - y = 2 To find slope m...

*February 21, 2011*

**algebra**

Are you Julie? This exact question was answered two days ago. http://www.jiskha.com/display.cgi?id=1298153937

*February 21, 2011*

**intermediate algebra**

x = amount invested at 0.05 y = amount invested at 0.03 0.05x + 0.03y = 28. x + y = 706 Solve the set of equations simultaneously If you are correct, x = $341 y = $365

*February 21, 2011*

**algebra**

All I could find was, 6 octillion, 789 septillion

*February 20, 2011*

**math**

Vanny, you are correct 6/20 = 0.3 or you can leave as 6/20 = 3/10

*February 20, 2011*

**calc**

Mistake fixed below -1/4 sin^3 x cos x + 3/4 (-1/2 sin x cos x + 1/2 | 1 dx ) -1/4 sin^3 x cos x + 3/4 (-1/2 sin x cos x + 1/2 x) + C -1/4 sin^3 x cos x - 3/8 sin x cos x + 3/8 x + C

*February 20, 2011*

**calc**

Hold on a few minutes, I might have a mistake.

*February 20, 2011*

**calc**

My answer, "|" = integral symbol |sin^4 x dx = -1/4 sin^3 x cos x + 3/4 (-1/2 sin x cos x + 1/2 | sin x dx ) -1/4 sin^3 x cos x + 3/4 (-1/2 sin x cos x + 1/2 (-cos x)) + C -1/4 sin^3 x cos x + 3/4 (-1/2 sin x cos x - 1/2 cos x) + C -1/4 sin^3 x cos x - 3/8 sin x cos ...

*February 20, 2011*

**math please help**

You didn't give the dimensions of the doors?

*February 20, 2011*

**math please help**

x = average saves needed 175 + 6x > 236 6x > 61 x > 10.1667

*February 20, 2011*

**math please help**

Questions, for example, "175t 6x is less than 236" Does the problem state what the "t" and "x" stand for ? What is the sign between 175t and 6x (+, -, /, *) ?

*February 20, 2011*

**Math**

50 + x = elder's future age 15 + x = younger persons future age 50 + x = 3(15 + x) 50 + x = 45 + 3x 2x = 5 x = 2.5 yrs 50 + x = 50 + 2.5 = 52.5 yrs 15 + x = 15 + 2.5 = 17.5 yrs 3 * 17.5 = 52.5

*February 20, 2011*

**algebra**

Distance D = Rate R * Time T 60 = rate for car T = time for car 60T = distance for car 40 = rate for bus T + 1.50 = rate for bus 40(T + 1.50) = distance for bus Distances are equal 60T = 40(T + 1.50) Solve for T, time in hours for car to overtake the bus R + 40 = rate for train

*February 20, 2011*

**algebra**

Distance D = Rate R * Time T T = D/R R = rate for car R + 40 = rate for train 140/R = time for car 280/(R + 40) = time for train Times are equal 280/(R + 40) = 140/R Cross multiply and solve for R, rate for car R + 40 = rate for train

*February 20, 2011*

**algebra**

x = = amt of car loan at 0.037 y = amt house loan at 0.088 0.037x + 0.088y = 22611.73 x + y = 260394 Solve these two equations simultaneously

*February 20, 2011*

**algebra**

3x^2 + 10xy + 7y^2 (x + y )(3x + 7y)

*February 20, 2011*

**chemistry**

FYI You need to post specific questions regarding all the problems that you have posted. When you post question after question, all in a row, it appears that you are dumping your homework here. Tutors will not do not your homework for you. Post the work you have done for each ...

*February 20, 2011*

**chemistry**

FYI You need to post specific questions regarding all the problems that you have posted. When you post question after question, all in a row, it appears that you are dumping your homework here. Tutors will not do not your homework for you. Post the work you have done for each ...

*February 20, 2011*

**maths**

points (3,6) and (-5,-2) Slope m = (y2 - y1)/(x2 - x1) m = (-2 - 6)/(-5 - 3) m = -8/-8 = 1 Slope-intercept form of the equation, y = mx + b, where m = slope and b = y-intercept To find the y-intercept, Use either point to substitute into the equation, y = mx + b P (3,6), m = 1...

*February 20, 2011*

**maths**

3/5 boys, 1/10 girls, the remainder were adults First, find the LCD, 10 3/5 = 6/10 6/10 boys + 1/10 girls = 7/10 total children that were spectators

*February 20, 2011*

**Maths**

2x - y - y^2 cannot be factored.

*February 20, 2011*

**Math**

FYI Reiny, I didn't see that you had already solved this problem before I answered the same same post below. I noticed are answers were different. The height = diameter, not radius. I am not sure if 'Scratch my reply" means your 1st answer here or your 2nd answer.

*February 20, 2011*

**Math**

Cylinder SA = 2 pi r h + 2 pi r^2 diameter d = height = h radius r = 1/2 d = 1/2 h 200 = 2 pi 1/2 * h * h + 2 pi (1/2 h)^2 200 = 2(pi)(1/2 h^2) + 2(pi)(1/4 h^2) 200 = 2/2(pi)(h^2) + 2/4(pi)(h^2) 200 = 4/4(pi)(h^2) + 2/4(pi)(h^2) 200 = 6/4(pi)(h^2) 200 = 3/2(pi)(h^2) 400 = 3 (...

*February 20, 2011*

**algebra**

(2/5 - 1/3)/(2/3 - 3/4) Find the LCD for the numerator, 15 Find the LCD for the denominator, 12 (6/15 - 5/15)/(8/12 - 9/12) = (1/15)/(-1/12) Invert the denominator and multiply, 1/15 * -12/1 = -12/15 Reduce the fraction -12/15 = - 4/5

*February 19, 2011*

**mat/117--Incomplete problem**

(C-5)-^2 This is the second time you have posted this. You were already told to proofread your problem and you were asked a question (you failed to answer). The form of your problem doesn't make sense. Your problem is already in factored form. What is the '-' ...

*February 19, 2011*

**finance**

I would think that when preparing a budget historical trends should be considered. This is MY opinion or comment, not based on actual knowledge of this particular subject.

*February 19, 2011*

**intermediat algebra**

-2x + 9y = 56 9x – 9y = 0 Add these two equations 7x + 0y = 56 7x = 56 x = 8 Substitute x = 8 in either equation to find y. Then check your solution for x and y in the original equation(s).

*February 19, 2011*

**Algebra**

-0.2x^2+12x+11 When x = 30, y = 191, so yes, you are correct. Solve this equation by completing the square, -0.2x^2+12x+11 Divide both sides by -0.2 x^2 - 60x - 55 = 0 x^2 - 60x = 55 x^2 - 60x + 900 = 55 + 900 (x - 30)^2 = 955 + - (x - 30) = (sqrt(955)) + x - 30 = 30.9031 x = ...

*February 19, 2011*

**algebra**

19 games, made 0.38 of 203 shots 0.38 * 203 = 77.14 shots made 203 shots/19 games = 10.68 shots/game 10.68 shots * 8 games left = 85.44 possible shots 203 shots made + 85 shots yet to make = 288 shots 288 * 0.45 = 129.6 = 130 shots need to make ttl 130 ttl shots needed - 77 ...

*February 19, 2011*

**algebra**

x = people in audience 1/2 x = left 1st 1/3 (1/2 x) = 1/6 x = left next 1/4 (1/3)(1/2)x = 1/24 x = left last x - (1/2 x + 1/6 x + 1/24 x) = 9 Solve for x

*February 19, 2011*

**algebra**

This is a dumb question (my opinion only). If he has an empty stomach, wouldn't the minimum volume be the volume of the pizza? Cylinder volume = pi r^3 h I answered this question a few days ago, using the volume formula for a sphere. MattsRiceBowl suggested the shape of a ...

*February 19, 2011*

**algebra**

This exact question was answered recently. If the link below doesn't work, click on the first link under Related Questions below. http://www.jiskha.com/display.cgi?id=1297732134

*February 19, 2011*

**Math**

Maybe this link will help answer your question. http://satteststudy.com/average-sat-score/

*February 19, 2011*

**Algebra**

8x^3 + 1728 Factor out 8 8(x^3 + 216) Now, this is in the form of the sum of two cubes, (a^3 + b^3) = (a + b)(a^2 - ab + b^2) Hint, a^3 = x^3, a = x And, b^3 = 216, b = 6 8(x^3 + 216) Now, you should be able to easily factor this.

*February 19, 2011*

**Algebra**

(-11)^(-3) = 1/(-11)^3 = - 1/1331

*February 19, 2011*

**Algebra**

Julie, because of formatting please type division problems as follows (using "/" for division). If this is your problem, ((4y^2)^5)/y^-3 1024y^10/y^-3 = 1024y^13 Subtract the exponents, 10 - (-3) = 13 Or, 1024y^10/(1/y^3) Invert the denominator and multiply, 1024y^10...

*February 19, 2011*

**Math**

x = Overtime hrs 30x = Overtime wages 5x = Regular hrs 20(5x) = Regular wages 30x + 20(5x) = 650 30x + 100x = 650 130x = 650 x = 5 overtime hours 30 * 5 = $150 OT pay 20 * 25 = $500 Reg pay Total 30 hrs = $650

*February 19, 2011*

**Mathematics**

1.find the capacity of rectangular tone? in liters. If you mean the volume of a rectangular solid, then (since you didn't specify, I will assume feet) V = Lwh L = 5.5, w = 3.5, h = 3.6 V = (5.5)(3.5)(3.6) V = 69.3 cubic feet To convert to liters 1 ft = 12 in 1 in = 2.54 cm...

*February 19, 2011*

**algebra**

Answered in your previous post.

*February 19, 2011*

**algebra**

D = RT (Distance = Rate * Time) 110 = rate of Train B T = time of Train B 110T = distance of Train B 100 = rate of Train A T + 0.50 = time of Train A (10:40 - 10:10 = 30 min = 60/30 = 0.50 h) 100(T + 0.50) = distance of Train A Distances are equal 110T = 100(T + 0.50) 110T = ...

*February 19, 2011*

**jj**

$11.50 - $6.50 = $5.00 $5.00/$6.50 = 0.769231 0.769231 * 100 = 76.92308% of increase

*February 18, 2011*

**FP/101 FOUNDATIONS OF PERSONAL FINANCE (AXIA)**

Just a guess, but FRM (fixed rate mortgage), first developed by the Federal Housing Administration (FHA).

*February 18, 2011*

**AP physics**

See 1st link below under Related Questions. This almost exact problem was answered.

*February 18, 2011*

**algebra**

Ann/Sam, none of your problems make sense. I have no idea what you are trying to do.

*February 18, 2011*

**algebra**

Ann/Sam, none of your problems make sense. I have no idea what you are trying to do.

*February 18, 2011*

**algebra**

Ann/Sam, none of your problems make sense. I have no idea what you are trying to do.

*February 18, 2011*

**algebra**

Ann/Sam, none of your problems make sense. I have no idea what you are trying to do.

*February 18, 2011*

**foundationd of personal finance**

Pack your lunch at home instead of eating out every day (assuming you work). Bring a thermos of coffee to work instead of stopping at Starbucks.

*February 18, 2011*

**Geometry**

V = pi r^2 h units^3 r = 5, h = 4 V = (3.14)(5^2)(4) units^3 V = ?

*February 18, 2011*

**Algebra HELP**

In the future, please number each problem. 1. 18/5 2. all values of x ( all real numbers) 3. all values of x ( all real numbers) 4. no solution

*February 18, 2011*

**Algebra**

8x^2 - 16xy + 8y^2 Factor out 8 8(x^2 - 2xy + y^2) Now, using the form of, square of a difference a^2 - 2ab + b^2 = (a - b )^2 8(x^2 - 2xy + y^2) = 8(x - y)^2

*February 18, 2011*

**Algebra again. Help**

Recheck your problem. As your problem is stated, Reiny is correct.

*February 18, 2011*

**Algebra: Help please**

Please see this link for a definition. http://www.mathsisfun.com/definitions/monomial.html

*February 18, 2011*

**geometry**

Your question is not clear. "if df equals 300m, find df. round to the nearest tenth." Find df? df = 300m

*February 18, 2011*

**calculus--No question**

What is your question?

*February 17, 2011*

**P I**

84 - 60 = 24 (24/60) * 100 = % of increase = ?

*February 17, 2011*

**Math**

If you expect an answer to your question please put your school subject in the School Subject box.

*February 17, 2011*

**MPG**

525 mi /17.5 gal = mi/gal = ?

*February 17, 2011*

**Math**

If you expect an answer to your question please put your school subject in the School Subject box.

*February 17, 2011*

**notation**

If you mean percent, 5/8 = 0.625 * 100 = 62.5%

*February 17, 2011*

**commission rate**

150/3000 = 0.05 * 100 = 5%

*February 17, 2011*

**math**

g = grams of 99% cocoa 0.99g = value of 99% cocoa 200 - g = grams of 70% cocoa 0.70(200 - g) = value of 70% cocoa 0.86(200) = value of mixture 0.99g + 0.70(200 - g) = 0.86(200) Solve for g, grams of 99% cocoa 200 - g = grams of 70% cocoa

*February 17, 2011*

**To helper -**

I'm sorry, I have been having problems with my email. Soon as my son-in-law arrives home he can check from his computer (somehow?). I've had nothing but problems since I upgraded to Outlook from Outlook Express.

*February 17, 2011*

**Algebra**

q = number of quarters 3q - 4 = number of dimes 0.25q = value of quarters 0.10(3q - 4) = value of dimes 0.25q + 0.10(3q - 4) = 7.85 Solve for q, number of quarters 3q - 4 = number of dimes

*February 17, 2011*

**Algebra**

45t^2 - 72t + 24 Only 3 can be factored from each term.

*February 17, 2011*

**math**

4 2/3 = 14/3 15 * 14/3 = 210/3 = 70 Alternate way 15 * 4 2/3 = 15 * 4 + 15 * 2/3 = 60 + 30/3 = 60 + 10 = 70

*February 17, 2011*

**math**

13 1/3 divide by 6 2/9 13 1/3 = 40/3 6 2/9 = 56/9 Dividing is the same as multiplying by the reciprocal (13 1/3)/(6 2/9) = 40/3 * 9/56 = 120/56 = 2 8/56 = 2 1/7 I'm not sure what your question was, but it appears that you arrived at the correct answer.

*February 17, 2011*

**pre algebra**

Dividing is the same as multiplying by the reciprocal. (1/2)/(2/3) = 1/2 * 3/2 = 3/4

*February 16, 2011*

**algebra**

x = miles walked x + 5.75 = miles jogged(3/4 = .75) x + x + 5.75 = 15 Solve for x, miles walked

*February 16, 2011*

**math**

5.1 x 10^-6 Since the exponent is negative, count 6 places to the left from where the decimal point is. 5.1 x 10^-6 = 0.0000051

*February 16, 2011*

**Math**

Two Angles are Supplementary if they add up to 180 degrees. 180 - 35.5 = ?

*February 16, 2011*