Sunday
February 14, 2016

# Posts by Helper

Total # Posts: 1,756

Algebra
The slope-intercept form of an equation is, y = mx + b m = the slope b = the y-intercept You need to solve your equation for y, for the equation to be in the slope-intercept form. 3y = 2x - 9 Divide both sides by 3, y = 2/3 x - 9/3 y = 2/3 x - 3 Now, the equation is in the ...
February 24, 2011

Math
L x W x H 18 x 14 x 8 Room Perimeter P = 2W + 2L P = 2(14) + 2 (18) P = 28 + 36 P = 64 Perimeter * Height P = 64, H = 8 Area to paint = 64 * 8 A = 512 sq ft 512 sq ft/256 sq ft paint coverage = gal of paint needed 512/256 = 2 gals per coat 2 gals/coat * 2 coats = ? ttl gals ...
February 24, 2011

math
Distance, D = Rate, R * Time, T D = y R = 15 fps T = x seconds D = RT y = 15x
February 24, 2011

geometry
First, you need to graph this triangle. Then, use the distance formula to find the distance between points (length of the sides). Area A = 1/2 bh
February 24, 2011

Math
Also, I just noticed, Type A contains (????HOW MANY) ounces of oats and (????HOW MANY)ounces of corn per pound. Type B contains (????HOW MANY)ounces of oats and (????HOW ANY)ounces of corn per pound.
February 24, 2011

Math--Shell Missing Info
Please recheck your problem, your are missing information. Type A and Type B are both oats and corn mixtures. Is this correct? The farmer wants to combine the two feeds so that the resulting mixture has at least (????HOW MANY POUNDS) pounds of oats and at least(????HOW MANY ...
February 24, 2011

math
x = amount invested at 6% y = amount invested at 8% 0.06x = interest at 0.06 0.08y = interest at 0.08 Solve simultaneously, x + y = 6400 0.08y = 2(0.06x) x = \$2560 y = \$3840 \$153.60 = 6% int \$307.20 = 8% int
February 24, 2011

Maths
A. The circumference of a circle is the actual length around the circle. Circumference C = 2 pi r r = 30, pi = 3.14 C = (2)(3.14)(30) C = 60(3.14) C = 188.4 for 1 lap 6 laps = 6 * C 6 laps = 6 * 188.4 meters 6 laps = ? meters B. P = 2w + 2L w = 37 cm./100 = 0.37 m L = 5.2 m P...
February 24, 2011

S.P
I = PRT (Interest = Principal*Rate*Time) I = 30,000 * 0.07 * 4 I = ?
February 24, 2011

math !!!! :O
February 24, 2011

math
3x^2 y - 5xy + 12x y^2 - 5x y^2 - 4xy 3x^2 y + 7x y^2 - 9xy
February 24, 2011

trig
360 deg = circle 360/6 = 60 deg 60 deg * pi/360 = 60pi/360 = pi/3 rads
February 24, 2011

Algebra 1
x = Rate without wind y = Rate of the wind T = D/R 6 = 3000/(x - y) 6(x - y) = 3000 6x - 6y = 3000 5 = 3000/(x + y) 5(x + y) = 3000 5x + 5y = 3000 Solve simultaneously, 6x - 6y = 3000 5x + 5y = 3000 5 *(6x - 6y = 3000)= 30x - 30y = 15,000 6 *(5x + 5y = 3000)= 30x + 30y = 18,...
February 24, 2011

math-Mathmate could you look at please
I was working on this at the same tiime as you, but I arrived at a different answer. x = amt Tierra had 2x/5 = amt Tierra spent 3x/5 = amt Tierra had left y = amt Alex had 4x/5 = amt Alex spent y - 4x/5 = amt Alex had left z = amt Nico had \$40 = amt Nico spent z - 40 = amt ...
February 24, 2011

math
I = PRT (Interest, I = Principal, P * Rate, R * Time, T P = 30,000 R = 7% = 0.07 T = 4 I = 30,000 * 0.07 * 4 I = 2100 * 4 I = 8400
February 24, 2011

math
h/-6 >= 5
February 23, 2011

Or, your could do, Assuming you know that a dollar is 10 dimes, etc. 1.00 = 10 dimes 4.00 = 4 * 10 dimes = 40 dimes 0.60 cents = 6 dimes 4.60 = 40 dimes + 6 dimes 4.60 = ? dimes
February 23, 2011

3/5 of a dollar = 0.60 (3/5) 4.60/0.10 = ?
February 23, 2011

algebra
(8.1 x 10^-9) x (4 x 10^2)? There are different ways to approach this problem I would do this problem like this, 8.1 * 4 * 10^-9 * 10^2 32.4 * 10^-7 0.00000324 32.4 with the decimal point moved 7 places to the left (since the exponent is negative)
February 23, 2011

math 117 for bobpursley
Ally is NOT correct.
February 23, 2011

math
Distance D = Rate R * Time T R = rate she rowed R + 2 = combined rate (rowing and river current) RT = D (R + 2)*6 = 16 6R + 12 = 16 6R = 4 R = 4/6 = 2/3 = 0.67 R = 0.67 km/hr rowing
February 23, 2011

ALGEBRA
If you asked this same question yesterday, refer to that post. I know this was answered yesterday, but I search quickly and can't find it.
February 23, 2011

geometry
Area of square = side s^2 100 = s^2 s = 10 The diagonals of a square bisect each other and meet at 90 degrees. The diagonals of a square bisect its angles. The diagonals of a square are perpendicular. The diagonals of a square are equal. This means that the two diagonals ...
February 23, 2011

math
Integration of x^2 ln(x^3+2) | = integration symbol | x^2 ln(x^3 + 2) w = x^3 + 2 dw = 3x^2 1/3 dw = x^2 1/3 | ln(w) dw Integration by parts | u dv = uv - | v du u = ln(w) dv = dw du = 1/w dw v = w 1/3 | ln(w) dw = 1/3 ln(w) w - 1/3 | w 1/w dw = 1/3 w ln(w) - 1/3 | w/w dw = 1/...
February 23, 2011

math
derivative of ln(x^3 + 2) f'(ln(f(x))) = 1/(f(x)) * f'(x) f'(ln(x^3 + 2)) = 1/(x^3 + 2) * 3x^2 f'(ln(x^3 + 2)) = 3x^2/(x^3 + 2) f' = 3x^2/(x^3 + 2)
February 23, 2011

geometry
A regular octagon has 8 equal sides P = sum of all the sides, or P = number of sides * length of side P = 8 * 9.4 P = ?
February 23, 2011

math
Volume of sphere, V = 4/3 pi r^3 2123 = 4/3 pi r^3 6369 = 4 pi r^3 1592.25 = pi r^3 1592.25 = (3.14)r^3 507.086 = r^3 r = 7.97432
February 23, 2011

math
(-3,7), (5,-1) Slope-intercept form of the equation is, y = mx + b m = slope b = y-intercept To find slope, m Slope m = (y2 - y1)/(x2 - x1) m = (-1 - 7)/(5 - (-3)) m = -8/8 = -1 To find y-intercept, b Use either point, (-3,7) and substitute the x and y values in the slope-...
February 23, 2011

algerbra/math
x = amount Don has "Leo has 1/5 of the amount Don has" Since Don has " x amount", then 1/5 x = amount Leo has
February 23, 2011

algerbra/math
x = amount Don has "Nadia has 1/2 of the amount Don has" Since Don has " x amount", then 1/2 x = amount Nadia has
February 23, 2011

algerbra/math
Sky, I've done two examples for you. All your problems are the same. Your turn to try the other problems. Post your answers and I will check them for you.
February 23, 2011

math
Or maybe the problem is , (?) 7/25 * 360 (no decimal point) = 2520/25 = 100.8 degrees
February 23, 2011

math
9% = 0.09 0.09 * \$245 = \$22.05 spent
February 22, 2011

Math
60% = 60/100 = 6/10 completed 10/10 - 6/10 = NOT completed
February 22, 2011

Math
Correct ! Good job :)
February 22, 2011

Math
d = number of DVDs 4d = number of CDs d + 4d = 60 5d = 60 d = ?
February 22, 2011

Algebra 2
2000-60P > 460 + 94p 1540 > 154p 10 > p p < 10 2000-60P < 460 + 94p 1540 < 154p 10 < p p > 10
February 22, 2011

Algebra 2
February 22, 2011

math
What shape is the container ?
February 22, 2011

algebra 2
Which is it -40.4t or -40.5t? First you have -40.4t, then you have -40.5t o(t) = -40.5t + 2159 -40.5t + 2159 < 1750 -40.5t < -409 t > -409/-40.5 t > 10.09877 = 10 t years after 2000 2000 + t years = ?
February 22, 2011

math
2 pints = 1 quart 4 cups = 1 quart Is this what you mean?
February 22, 2011

Algebra 2
-7x^4 + 8x^3 - 8x^2 + 3x-4 The first term in the polynomial, when it is written in decreasing order, is also the term with the biggest exponent, and is called the "leading term". The exponent on a term tells you the "degree" of the term. For instance, the ...
February 22, 2011

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
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

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

February 21, 2011

math
February 21, 2011

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

You didn't give the dimensions of the doors?
February 20, 2011

x = average saves needed 175 + 6x > 236 6x > 61 x > 10.1667
February 20, 2011

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
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