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September 21, 2014

Posts by Helper


Total # Posts: 1,700

MATH
6/330 =0.018182
January 18, 2011

Math
5x = 4y - 30 2x + 3y +-12 (1) 5x - 4y = -30 (2) 2x + 3y = 12 multiply (1) by 3(5x - 4y = -30) (1) 15x + 12y = -90 multiply (2) by 4(2x + 3y = 12) (2) 8x + 12y = 48 ADD two new equations (1) 15x + 12y = -90 (2) 8x + 12y = 48 23x + 0 = -42 23x = -42 x = -42/23 substitute x = -42...
January 18, 2011

math
correction-this should be net salary * 12 mo. = annual net salary
January 18, 2011

math
you have a typo in $2,3500.00 Monthly wage - 468 = net salary net salary * 52 weeks = annual net salary
January 18, 2011

math
1 1/12 = 13/12 2 = 24/12 24/12 - 13/12 = 11/12 left
January 18, 2011

math
165/3 = ?
January 18, 2011

algebra
3x - 5y = 61 3x - y = 17 multiply 1st by -1(3x - 5y = 61) -3x + 5y = -61 3x - y = 17 ADD two equations 0 + 4y = - 44 4y = -44 y = -11 substitute y = -11 in 3x - y = 17 to find x 3x - y = 17 3x + 11 = 17 3x = 6 x = 2 check x = 2, y = -11 in one of the equations I'll leave ...
January 18, 2011

Math
r = 5, h = 10 SA = 2 pi r^2 + 2 pi r h SA = 2(pi)(5^2) + 2(pi)(5)(10) SA = 2(pi)(25) + 2(pi)(5)(10) SA = 50pi + 100pi SA = 150 pi m^2 do you have the formula for a right circular cylinder? I've checked my math and I get 150pi m^2 if you can post the formula from your book ...
January 18, 2011

Math
r = 5, h = 10 SA = 2 pi r^2 + 2 pi r h SA = 2(3.14)(5^2) + 2(3.14)(5)(10) SA = 2(3.14)(25) + 2(3.14)(5)(10) SA = 50(3.14) + 100(3.14) SA = 157 + 314 = 471 m^2
January 18, 2011

algreba
n = number of trees 84n <= 2400 n <= 28.57
January 18, 2011

math
this is an easy one to graph. just pick some values for x or y and solve for the other value what are you having trouble doing? we can't graph it for you. for y = x + 1 x = 0, y = 1 (0,1) x = 1, y = 2 (1,2) x = 2, y = 3 (2,3) x = 3, y = 4 (3.4) x = 4, y = 5 (4,5) for y = ...
January 18, 2011

Calculus
forgot to add, there are other forms for this answer post your answer if you are not sure if equil. to above posted answers
January 18, 2011

Calculus
Answer 1/3 (sqrt(x^2 + 100))^3 - 100(sqrt(x^2+100)) + C this can be transformed into 1/3 (x^2 - 200)(sqrt(x^2 + 100) + C my book had 1st answer (not transformed) let me know if you need more help with this
January 18, 2011

math
A = Lw A = 9 * 3 A = 27 sq ft/units 27 * 12 = ?
January 18, 2011

math
I used an online calculator for this Mean = 59.64 Median = 58 Sample standard deviation = 10.19
January 18, 2011

math
this is a permutations 3 cds / 3 cases = 3! = 3 x 2 x 1 = 6 6 different ways
January 18, 2011

algebra
900/3 = 300/yr 300/7500 = .04 Or PRT = I R = I/PT R = 900/(7500 * 3) R = .04 = 4%
January 18, 2011

math/algebra
y = 1/2 x - 4 what do you need to do ?
January 18, 2011

Math
SA = 2 pi r^2 + 2 pi r h r = 5, h = 10 SA = 2(3.14)(5^2) + 2(3.14)(5)(10) I'll leave the math to you. express answer in sq m
January 18, 2011

Geometry
right triangle
January 18, 2011

Geometry
L = 11 w = 13'10" = 13.83' A = Lw A = 11 * 13.83 A = ? sq ft
January 18, 2011

Geometry
1) L = 120 - 20 = 100 w = 80 - 20 = 60 A = Lw A = 100 * 60 A = 6000 sq ft 2) 12,500/50 = 250 sq ft/dog 6000/250 = 24 dogs
January 18, 2011

Geometry
12 x 6 = 72 req, space needed x = total space .15x = 72 x = 480
January 18, 2011

Geometry
x = 1st angle x + 20 = 2nd angle x + x + 20 = 90 2x = 70 x = 35 35, 55
January 18, 2011

Geometry
using ratios 4'" = 4.75' 4.75 : 6 = x : 19 4.75/6 = x/19 cross multiply 90.25 = 6x x = 15.04167 x = 15 check my math, it's late for me
January 17, 2011

Algebra 2
L = length w = L - 3 A = Lw 28 = L * (L - 3) 28 = L^2 - 3L L^2 - 3L - 28 = 0 solve by completing the square if you are right L = -4, L = 7 since length can't be neg., throw out -4, so L = 7 and width = 4
January 17, 2011

Math
C = pi* d or C = 2* pi r C = pi * 10 C = 10pi
January 17, 2011

Math (Algebra 2)
answer is 5x^3 - 14x^2/3 - 40x/9 + 256/27 + (230/27)/(3x + 1) this is really something you need to do yourself because I can't show you how, I can only give you the answer
January 17, 2011

Algebra 2
x = heather now 5x = george now 5x + 4 = 3(x + 4) 5x + 4 = 3x + 12 2x = 8 x = 4 heather - 4 george - 20
January 17, 2011

5th math
I don't think anyone understands what the 'sample space' is, at least that is why I haven't answered. It seems like 5th grade math is harder than calculus!!
January 17, 2011

RATIOS MATH
x : 6 = 20 : 24 x/6 = 20/24 cross multiply 24x = 120 x = 5
January 17, 2011

MaTh = Algebra = help
How did you get -2 as an answer? Did you divide 5x by 5 and 10 by five to get 2? YES You lost me right here: How did you do this? x - 2y = 10 -2 - 2y = 10 -2y = 12 y = -6 How did you get the second line? -2 - 2y = 10? to find the value of y, since you know x = -2, you plug x...
January 17, 2011

MaTh = Algebra = help
x - 2y = 10 3x - y = 0 eliminate y by multiplying 3x - y = 0 by -2 -2(3x - y = 0) = -6x + 2y = 0 ADD the 2 equations x - 2y = 10 -6x + 2y = 0 -5x + 0 = 10 -5x = 10 x = -2 substitute x = -2 in x - 2y = 10, to find y x - 2y = 10 -2 - 2y = 10 -2y = 12 y = -6 check x = -2, y = -6 ...
January 17, 2011

Math
A = Lw w = width 2w = length 200 = w(2w) 200 = 2w^2 100 = w^2 10 = w P = 2L + 2w w = 10 L = 2w = 20 P = 2(10) + 2(20) P = ?
January 17, 2011

Math
TA = 6e^2 TA = 6(2^2) TA = 6 (4) TA = 24 m^2
January 17, 2011

Math
V = 4/3 pi r^3 V = 4/3 pi (5^3) V = ?
January 17, 2011

Math
A = 4 pi r^2 A = 4 pi (5^2) A = ?
January 17, 2011

Math
see first link below under related questions your post was answered already below please do not repost without checking to see if your original post was answered
January 17, 2011

Math grade7
ADD up purchases and earnings -12.00 + 15.00 - 7.00 - 8.50 + 8.00 + 2.00 = - 2.50 x = money she started with x + -2.50 = 22.25 x = 22.25 + 2.50 x = 24.75
January 17, 2011

Math
I cos (2x/3) dx = 3/2 sin (2x/3) sorry, forgot 0 to pi/2 3/2 sin 2/3 (pi/2) - 3/2 sin 0 3/2 sin (2pi/6) - 0 3/2 sin (pi/3) 3/2 (sqrt3/2) 3 sqrt3/4
January 17, 2011

Math
Integrate cos (2x/3) dx u = 2x/3 du = 2/3 dx 3/2 du = dx I = integrate symbol I cos (2x/3) dx = I cos u 3/2 du I cos (2x/3) dx = 3/2 I cos u du I cos (2x/3) dx = 3/2 sins u since, u = 2x/3 I cos (2x/3) dx = 3/2 sin (2x/3)
January 17, 2011

Calculus
7x + 42 = 7(x + 6)
January 17, 2011

math(algebra 1)
y = -x + 3 y = x + 1 rewrite y + x = 3 y - x = 1 to eliminate the variable x, add the 2 equations together. Since x + -x = 0, the x variable is eliminated ADD y + x = 3 y - x = 1 2y = 4 y = 2 to find x, substitute y = 2 in y + x = 3 2 + x = 3 x = 1 CHECK x = 1, y = 2 y - x = 1...
January 17, 2011

math
x = kim's points x + 5 = lynn's points 3(x + 5) = camilla's points x + x + 5 + 3(x + 5) = 50 x + x + 5 + 3x + 15 = 50 5x + 20 = 50 5x = 30 x = 6 kim has 6 pts lynn has 11 pts camilla has 33 pts
January 17, 2011

Math
4 log x - 2 log y + 1/3 log w (4 log x + 1/3 log w) - 2 log y (log x^4 + log w^1/3) - log y^2 log (x^4 w^1/3) - log y^2 log (x^4 w^1/3)/y^2 I am not a tutor
January 17, 2011

geometry
A 45-45-90 deg triangle is one-half a square. The length of a leg opposite a 45 deg angle equals one-half the length of the hypotenuse times the square root of 2. to find one of the sides of the square, c = a * sqrt2 (the diagonal) 8(sqrt2) = a * sqrt2 a = 8 P = 4s P = 4 * 8 P...
January 17, 2011

Math
integrate (x+1)sqrt(2-x)dx u = (sqrt(2 - x)) u^2 = 2 - x x = 2 - u^2 - 2u du = dx I = integral sign I (2 - u^2 + 1)u -2u du I (3 - u^2)-2u^2 du I (-6u^2 + 2u^4) du -6 I u^2 du + 2 I u^4 du 2 I u^4 du - 6 I u^2 du 2 (1/5 u^5) - 6 (1/3 u^3) 2/5 u^5 - 2u^3 substitute back in for ...
January 17, 2011

Math
see your post above answered already
January 17, 2011

math
see solution above, I figured that the second '=' sign was supposed to be '+'
January 17, 2011

math
-3(4b-10) = .5(-24b+60) -12b + 30 = -12b + 30 all values of b are solutions
January 17, 2011

math
3 (g-3) = 6 3g - 9 = 6 3g = 15 g = 5
January 17, 2011

Math
The measure of an interior angle is one half of the measure of the intercepted arc.
January 17, 2011

math
A parallelogram is a four sided figure with its opposite sides parallel to each other. A rectangle is a parallelogram whose four angles are all 90' so draw a parallelogram such that the sides, (width), are parallel to each other but NOT perpendicular to the base (so the 90...
January 17, 2011

math
see first link below under related questions REINY already answered part of this if you are having trouble, post your work and someone will help if you are stuck tutors do not do your homework for you
January 17, 2011

geometry
use the Pythagorean theorem 25^2 = b^2 + x^2 now solve for b
January 17, 2011

math
1 7/5 1 = 5/5 5/5 + 7/5 = 12/5 is this what you need? or 1 7/5 = 12/5 = 2 2/5 because 12 divided by 5 = 2 2/5
January 17, 2011

math
you're welcome :)
January 17, 2011

math
25 < n - 12 37 < n n > 37
January 17, 2011

algebra
p = pennies 2p - 9 = nickles 3p - 19 = dimes p + 2p - 9 + 3p - 19 = 140 6p - 28 = 140 6p = 168 p = 28 p = pennies = 28 2p - 9 = nickles = 47 3p - 19 = 65
January 17, 2011

Algebra 2
g(f(x))= 2(x^2 + 1)^2 = 2 (x^4 + 2x^2 + 1) = 2x^4 + 4x^2 + 2
January 17, 2011

Math
A = x^2 - 10x + 25 = (x - 5)(x - 5) A = Lw L = (x - 5), w = (x - 5) P = 2w + 2L P = 2(x - 5) + 2(x - 5) P = 2x - 10 + 2x - 10 P = 4x - 20
January 17, 2011

Math
A = Lw L = 5x + 10 w = 5x - 5 A = (5x + 10)(5x - 5) A = ? expand and collect like terms for your answer
January 17, 2011

Math
the expression needs to be simplified I tried
January 17, 2011

math
4 C 2 = combination of 4, taken 2 at a time C(4,2) = (4!/(4 - 2)!)/2! = 4!/(2!2!) C(4,2) = (4x3x2x1)/(2x1x2x1)= 24/4 = 6 total of 6 combinations 1 out of 6 possible combinations I am not a tutor
January 17, 2011

mat h
x = amt at 3% y = amt at 5% x + y = 2000 .03x + .05y = 84 solve simultaneously for x, y give it a try, post if you need for help x = 800, y = 1200 if you are right
January 17, 2011

math
6x^2-1 = -1/6 (sqrt6 - 6x)(sqrt6 + 6x)
January 17, 2011

geometry
if you sketch this you will see that the median from Q, bisects segment PR to write the equation of the median you need to find the midpoint of PR P(0,12), R(-2,2) using the midpoint formula 1/2 (x1 + x2), 1/2 (y1 + y2) 1/2(0 + -2), 1/2(12 + 2) 1/2(-2), 1/2(14) Midpoint (-1,7...
January 17, 2011

Algebra
3x-2y=10 2x+3y=-2 By substitution 3x - 2y = 10 2x + 3y = -2 3x = 10 + 2y x = 10/3 + 2/3 y 2(10/3 + 2/3 y) + 3y = -2 20/3 + 4/3 y + 3y = -2 20/3 + 4/3 y + 9/3 y = -2 20/3 + 13/3 y = -2 13/3 y = -2 - 20/3 13/3 y = -6/3 - 20/3 13/3 y = - 26/3 y = -26/3 * 3/13 y = - 78/39 = -2 to ...
January 17, 2011

Math
300 km/h to mph 1 mph = 1.609344 km/hr 300/1.609344 = 186.411358 mph
January 17, 2011

Math
:) sometimes the easiest problem stumps me!
January 17, 2011

Math
By Property of Exponential Function, a^0 = 1 (abc)^0 = 1
January 17, 2011

Math
yes, ^ means squared. if no parentheses, I don't know why I am not a tutor, maybe REINY or another tutor will answer
January 17, 2011

Math
was the problem written as -(5^2) = -(25)= -25 where, (-5^2) = 25
January 17, 2011

Math
correct!! :)
January 17, 2011

Math
set up as equation and solve for N 2/3 N = 4 2N = 12 N = 6 1/2 N = ? N = 6 1/2 6 = ?
January 17, 2011

Math
22,000 cost before interest less 3,000 down payment 19,000 amount financed 600/mo for 40 mo = 24,000 total cost with interest 24,000 - 19,000 = 5000.00 interest on amt financed 5000/19000 = 26.32% simple interest rate 5000 finance chrg 19,000 amount financed 24,000 installment...
January 17, 2011

math
you are missing the exponents if (a) should be 2x^2 - 7x - 5 a) 2x^2 - 7x - 5 does not factor, solve by using the quadratic formula or completing the square if you are stuck, post your work and someone will help tutors do not do your homework
January 17, 2011

Algebra II
is this your problem (x^2 - 1)/1 divided by (x - 1)/(x + 5)? if so, (x^2 - 1)/1 = x^2 - 1 to divide, invert the denominator and multiply, so, (x^2 - 1) * (x + 5)/(x - 1) does this help?
January 17, 2011

math
2^(x-2)=54 take logarithm of both sides (x - 2)log 2 = log 54 x log 2 - 2 log 2 = log 54 x log 2 = log 54 + 2 log 2 x = (log 54 + 2 log 2)/log 2 find above logs x = 7.75 approx
January 17, 2011

alegebra 2
recheck your problem, not enough info given
January 17, 2011

Calculus
If this is your problem 2^-x = 3^(2x+2) take logarithms of both sides -x log 2 = (2x + 2)log 3 -x log 2 = 2x log 3 + 2 log 3 -x log 2 - 2x log 3 = 2 log 3 x (-log 2 - 2 log 3) = 2 log 3 x = -(2 log 3)/(log 2 + 2 log 3) plug in log values x = -0.760188
January 17, 2011

Calculus
see above post of yours
January 17, 2011

Maths
(3^-2e^4)^-1 = (1/9 * e^4)^-1 = (e^4/9)^-1 = 1/(e^4/9) = 9/e^4
January 17, 2011

Algebra
5 - 31 + 29 = ?
January 17, 2011

Phsyics
see this website to convert I can't post links so, put a / where there is a comma, and the usual other that you put before an address easysurf dot cc,cnver14 dot htm
January 17, 2011

Algebra
(5 + 31 + 29)/3 = average
January 16, 2011

math
simple interest I = PRT I = 5000 * .04 * 1.5 I = 300
January 16, 2011

Algebra
P = 2w + 2L 2*17 + 2L > 94 34 + 2L > 94 2L > 60 L > 30 length > 30 cm
January 16, 2011

Maths
3x - 6 = 3x/4 multiply both sides by 4 12x - 24 = 3x 9x = 24 x = 24/9 x = 8/3
January 16, 2011

college math 209
x = - b ± (sqrt(b^2 - 4ac))/2a 3x^2 + x - 8 = 0 a = 3, b = 1, c = -8 what do you need help with? I gave you the formula, you give it a try, post your work if you get stuck. tutors do not do your homework. they are here to help you do your work.
January 16, 2011

college math 209
(x+4)^2 = 2x^2 + 19x + 46 (x + 4)(x + 4) = 2x^2 + 19x + 46 x^2 + 8x + 16 = 2x^2 + 19x + 46 collect like terms, then solve you try and post back if you need help
January 16, 2011

Writing
from About dotcom, Homework/Study tips "Individual works of art like paintings and sculptures are underlined or italicized" * Michelangelo's David * Mona Lisa * The Last Supper * The Pieta A photograph, which is much smaller than a work of art, is placed in ...
January 16, 2011

college math 209
are you missing the exponent for 5y^ ?
January 16, 2011

Algebra
f = 6p p = f/6
January 16, 2011

algebra 209
3(sqrt250)= 3*(sqrt 25)* (sqrt 10) = 3 * 5 * (sqrt 10) = 15 (sqrt 10)
January 16, 2011

Algebra
the function is not clear to me what are the upside down ! ?
January 16, 2011

algebra
27^2/3 = (cube rt 27)^2 27^2/3 = 3^2 = 9
January 16, 2011

algebra
u = (sqrt(-u + 6)) u = (sqrt(6 - u)) square both sides u^2 = 6 - u u^2 + u - 6 complete the square u^2 + u = 6 u^2 + u + 1/4 = 6 + 1/4 (u + 1/2)^2 = 25/4 take the square root of both sides + - (u + 1/2) = 5/2 u + 1/2 = 5/2 u = 4/2 = 2 -u - 1/2 = 5/2 -u = 6/2 = 3 u = -3 check ...
January 16, 2011

algebra
do you mean u = (sqrt(-6 + u)) please use the word 'sqrt' and put in () what is included under the radical we will be able to assist you much faster if what you need is more clear thank you
January 16, 2011

MATH
Find AC? I assume you have a typo above? BC = BA + AC 5x - 3 = 2x + 5 + AC 3x - 8 = AC since A is the MP of BC and BA = 2x + 5 BC = 2(BA) BC = 2(2x + 5) BC = 4x + 10 BC = BC 5x - 3 = 4x + 10 x = 13
January 16, 2011

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