Friday
April 18, 2014

Posts by Helper


Total # Posts: 1,699

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 ...

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

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

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

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.

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, ...

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

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

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?

maths-Claire, please check problem
ãx(8-x) ? Please edit your problem.

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

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 = ?

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 ram...

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,...

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

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

algebra
All I could find was, 6 octillion, 789 septillion

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

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

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

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 ...

math please help
You didn't give the dimensions of the doors?

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

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 (+, -, /, *) ?

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

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

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

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

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

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 ...

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 ...

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...

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

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

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.

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 (p...

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

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 '-' befor...

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.

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).

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 = ...

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 sh...

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

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 ...

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

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

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.

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

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...

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

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...

algebra
Answered in your previous post.

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 = 1...

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

FP/101 FOUNDATIONS OF PERSONAL FINANCE (AXIA)
Just a guess, but FRM (fixed rate mortgage), first developed by the Federal Housing Administration (FHA).

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

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

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

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

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

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.

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

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

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

Algebra again. Help
Recheck your problem. As your problem is stated, Reiny is correct.

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

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

calculus--No question
What is your question?

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

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

MPG
525 mi /17.5 gal = mi/gal = ?

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

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

commission rate
150/3000 = 0.05 * 100 = 5%

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

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.

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

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

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

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.

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

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

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

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

math
Since you didnt specify, based on simple interest, 9 1/2% annual rate = 0.095 0.095/360 days = 0.000264 daily rate I = PRT I = 750 * 0.000264 * 200 I = ?

Calculus
sec^3 x tan x dx | = integral symbol Rewrite as | sec^2 x sec x tan x dx u = sec x du = sec x tan x | u^2 du 1/3 u^3 + C Substitute back in, u = sec x 1/3 sec^3 x + C

math--Arianna check your problem
25 = 5^3x-1 You need to use parentheses. Is it, 5^(3x - 1) ? Or, 5^(3)x - 1 ? Or, ?

Math- Algebra II
correct, no solution

algebra
x = plan 1 y = plan 2 175x = plan 1 cost 200y = plan 2 cost The two equations are, (Divided by 1000 for easier calculation) x + y = 38 175x + 200y = 7200 Solve these equations simultaneously to find x and y. (if you are correct, x = 16, y = 22)

math
5/t^1/4 - 6/t^2/3 I rewrite as, (my preference) 5t^(-1/4) - 6t(-2/3) h' = -1/4 * 5t^(-5/4) - (-2/3 * 6t^(-5/3)) h' = -5/4t^(-5/4) + 12/3t(-5/3) h' -5/4t^(-5/4) + 4t(-5/3) h' = 4/(t^(5/3)) - 5/(t(^5/4))

accounting
You also need to do an entry for the difference of 6500.

Survey of Math 140
Simple interest 10% = 0.1 /365 = 0.000274 daily interest 3/8 to 5/26 = 79 days 79 * 0.000274 = 0.021646 (79 day interest rate) * $4000 = $86.58 interest this period 5/27 to 7/31 = 65 days 65 * 0.000274 = 0.01781 (65 day interest rate) * $2700 ($4000 - 1300) = 48.08 interest th...

Math
(x+1)(4x^2-8x+7) u = x + 1 v = 4x^2 - 8x + 7 Use the product rule, d/dx (uv) = u dv/dx + v du/dx d/dx (uv) = (x+1)(8x-8)+(4x^2-8x+7)(1) You can take it from here

physics for scientists and engeneers I
assuming the 27 was really horizontal, then the change in velocity has to be determined. To get 43m high (that is pretty high)... 1/2 m vi^2=mg(43) vi=sqrt (86*9.8) change momentum=massball*deltaV ok,to get deltaV, deltaV=sqrt(86*9.8) j +27i) then force= changemometum/time you...

Physics
Doesn't one get a rainbow when a diamond bends light,each color in a slightly different directon?

Physics
what do currents do?

intermediate algebra-check my answer
You were given the points, (x1, y1) = (-8, -6) and (x2, y2) = (0, 0) y = 3/4 x + b Use one of the given points, for example, (-8, -6) Solve for b -6 = 3/4(-8) + b b = 0 Therefore, the equation is y = 3/4 x + 0 y = 3/4 x I guess I miss-understood you. I didn't realize that ...

intermediate algebra-check my answer
y = ax + b m = 3/4 y = 3/4 x + b You need to find b for this equation. Substitute one of the given points into your equation and solve for b. Then use that b value for your equation.

Calculus (I Truly Need Help) Continued
From algebra, do you know how to find the inverse? The same method is used. Have you tried to find the inverse?

math
(10,-4), (-3,10) Slope m = (y2 - y1)/(x2 - x1) m = (10 + 4)/(-3 - 10) m = 14/-13 = -14/13 = -1.07692

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