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May 26, 2015

Posts by Helper


Total # Posts: 1,738

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

college 209
multiply (2 sqrt 7 -5 sqrt 3)(8 sqrt7-5 sqrt 3) (2 sqrt 7 -5 sqrt 3)(8 sqrt7-5 sqrt 3) 112 - 50(sqrt 21) + 75 187 - 50(sqrt 21)
January 16, 2011

college 209
square root of ? '2a7' means? does it mean 2(sqrt7)?
January 16, 2011

college 209
what does the ~ over the a mean? does '2a7' mean 2a^7 ('a' to the 7th power) ?
January 16, 2011

math
0.5x + 2 = 0.2x - 7 subtract 0.2x from both sides 0.3x + 2 = -7 0.3x = -9 x = -30
January 16, 2011

algebra
uã6w^3 + wã96wu^2 6w^2 au (w + 16u)
January 16, 2011

math
15% = .15 .15 * 100 = ?
January 16, 2011

Math/Trig
Area K = 1/2 r^2 * angle in rads Convert deg to rads 55 deg * pi/180 = 55pi/180 = 11pi/36 rads 11pi/36 rads = .96 rads K = 1/2 (5.7)^2 * .96 K = ?
January 16, 2011

Math/Trig
Arc length = r * central angle in rads 95 d = 95*pi/180 = 95pi/180 = 19pi/36 19pi/36 = 1.66 rads Arc length s = 2.5 * 1.66 Arc length s = ?
January 16, 2011

math
I'll do the first to get you started, you try the others and post back and someone will check your answers a. 3/2 x^5 'x’ raised to the power ‘5’, this means the equation is a 5th degree equation. the coefficient is number before the variable, in this ...
January 16, 2011

Algbra
3/5k - (k + 1/3) = 1/15 (k + 3) remove ( ) 3/5k - k - 1/3 = 1/15k + 3/15 get rid of denominators since 15 is the LCD of 5, 3, 15 multiplying both sides by 15 will do this 15 (3/5k - k - 1/3) = 15(1/15k + 3/15) 9k - 15k - 5 = k + 3 -6k - 5 = k + 3 -7k = 8 k = -8/7
January 16, 2011

math
I = PRT R = I/PT I = 20(196) - 3500 I = 3920 - 3500 I = 420 T = 20 mo/12 T = 1.667 yr R = I/PT R = 420/(3500 * 1.667) R = 420/5834.5 R = .071986 R = 7.2% check I = PRT I = 3500 x 7.2% x 1.667 yr I = 252 x 1.667 I = 420.084 I am not a tutor
January 16, 2011

algebra
1 < 3x+5 < 12 -4 < 3x < 7 -4/3 < x < 7/3
January 16, 2011

math
monitor A 22:12:06 monitor B 22:54:07 diff. = 42:01 42 min 1 sec = 42 + 1/60 42 min 1 sec = 42.01667 min 42.01667/60 = 0.700278 hr R = D/T R = 62/.700278 R = 88.53627 km/hr R = 88.54 km/hr check D = RT D = 88.54 x .70 D = 61.978 62 = 61.978 I am not a tutor
January 16, 2011

Geometry
Area = s^2 A = 8^2 A = ?
January 16, 2011

algebra
you need to use brackets to show what is under the radical
January 15, 2011

math
first find the LCD then solve as you would simultaneous equations in three unknowns try it and post back if you need more help
January 15, 2011

math
are you missing something 16x + 13z = ?
January 15, 2011

algebra
(sqrt(6x + 6)) = (sqrt(x + 12)) square both sides 6x + 6 = x + 12 5x = 6 x = 6/5 without the use of ( ) I assumed sqrt of (6x + 6) and sqrt of (x + 12)
January 15, 2011

algebra 1
The equation of the straight line having slope m and y intercept b is y = mx + b m = 6.7 b = -7 y = 6.7x - 7
January 15, 2011

college math 209
u - 18 = 2 u = 20
January 15, 2011

college math 209
is this the equation ?, 2(sqrt5) + 3/(sqrt5) - 1 2(sqrt5) + 3(sqrt5)/5 - 1 to get rid of the radical in 3/(sqrt5). multiply 3/(sqrt5)*sqrt5/sqrt5 = 3(sqrt5)/5
January 15, 2011

algebra 1
the point would be (0,-3) for the graph plot the point and draw a line through it, this will be a line at y = -3, -3 units below and parallel to the x-axis
January 15, 2011

ALGEBRA
the rate is 15%
January 15, 2011

6th grade math
yes, you are correct
January 15, 2011

statistics
question? you are missing part of the problem
January 15, 2011

Geometry
Sum of measures of interior angles of a polygon of n sides = (n - 2 )*180 deg polygon with 4 sides, n = 4 (n - 2)*180 (4 - 2)*180 2*180 = 360
January 15, 2011

math
want do you need to find? this problem is not complete
January 15, 2011

Math
x = number of graph notebooks y = number of college ruled notebooks 2.64x = total value sold graph notebooks 3.61y = total value sold college notebooks x + y = 50 2.64x + 3.61y = 168.86 Solve these 2 equations together by elimination or substitution method I will use ...
January 15, 2011

algebra
I made the correction below let her regular rate be $x per hour let her overtime rate be $y per hour first week: 40x + 7y = 390 2nd week: 42x + 8y = 416 1st equat x 8 ---> 320x +56y = 3120 2nd equt x 7 ---> 294x + 56y = 2912 subtract 26x = 208 x = 8 substitute x = 8 40x...
January 15, 2011

algebra 2
ln(e^18x) = 9 Since, ln e^x = x ln e^18x = 18x 18x = 9 x = 2
January 15, 2011

geometry
not enough info posted to answer are RS and ST parts of RT ? Not sure if this pic will print right. Ignore if it doesn't. R------------S-------------T 12 13 What is A ?
January 15, 2011

mgt
who is "her" ?
January 14, 2011

Math
you have to draw a picture for this. If I did it right, I would think you would want the water line to run in a straight line from MW. To find the point on the water main, step 1--I wrote the equation of the line from M to W, using the given points. Equation MW - y = 4x - 6 ...
January 14, 2011

math
you're welcome
January 14, 2011

math
if you can picture this, it forms a rt triangle with the shortest leg 2, the longer leg 3, and you are looking for the hypotenuse. So, h^2 = 2^2 + 3^3 h^2 = 4 + 9 h^2 = 13 h = sqrt 13
January 14, 2011

geometry
V = Lwh the volume (given) = 24 ft^3 the height (given) = 18" = 1.5' 24 = L*w*1.5 divide both sides by 1.5 16 = Lw You need to find the number of feet in each side of the base since the box has a square base L = W AND, found above, L*w = 16 which of the above answers...
January 14, 2011

business math
you didn't give a time limit for the $20,000, so I'll assume 5yrs FV = PMT * (((1 + i)^n - 1)/i ) x = amt of PMT i = rate n = no. of payments i = .08/4 quarters = .02 n = 4 * 5 yr = 20 payments 20,000 = x *((1 + .02)^20 - 1 )/.02 20,000 = x *(( 1.02 )^20 - 1)/ .02 20,...
January 14, 2011

algebra
| x - 8 | < 14 this means x - 8 < 14 x < 22 -x + 8 < 14 -x < 6 x > -6 therefore, -6 < x < 22
January 14, 2011

Math/Trig
Area K = 1/2 r^2 * angle in rads Convert deg to rads 125 deg * pi/180 = 25pi/36 rads K = 1/2 * 3^2 * 25pi/36 K = ? m^2 you do the math Area K is expressed in m^2 (in this case)
January 14, 2011

Algrebra II-please check my answer
1. (-9/7, 0) you are correct 2. correct, but should be written as 2 <= x <= 8
January 14, 2011

geometry
30-60-90 special triangle has sides in the ratio of 1 : sqrt 3 : 2 (a:b:c) sin A = a/c = 1/2 hypotenuse = c = h side a = h - 12 (opposite 30 deg angle) set-up a ratio 1/2 = (h - 12)/h cross multiply h = 2(h - 12) h = 2h - 24 -h = -24 h = 24 hypotenuse = 24 side a (opposite 30 ...
January 14, 2011

algebra
x^2 - x - 6 list factors of -6, -6 x 1 = -6 6 x -1 = -6 -3 x 2 = -6 3 x -2 = -6 which factors of -6, when added, = -1 -6 + 1 = -5 N0 6 + -1 = 5 NO -3 + 2 = -1 YES x^2 - x - 6 = (x - 3)(x + 2) x^2 - 5x - 24 list factors of -24, -24 x 1 = -24 24 x -1 = -24 -12 x 2 = -24 12 x -2...
January 14, 2011

algebra
yes, you are correct
January 14, 2011

geometry
is this a triangle, square, rectangle or ? are AB, ST, AC sides, medians, or ? are A, T angles ?
January 14, 2011

symbols
assuming all the men take the same amount of time to milk each cow, 53 cows / 4 men = 13.25 cows each since you can't milk a fraction of a cow three men would milk 13 cows each and one man would milk 14 so the answer would be no, each man does not milk the same number of ...
January 14, 2011

Algebra
see you post below, I showed you there
January 14, 2011

Algebra
(1) x + y = 105 (2) 3x + 1.5y = 250 multiply equation (1) by -3 -3 (x + y = 105) = -3x - 3y = -315 add the two equations together -3x - 3y = -315 3x + 1.5y = 250 0 - 1.5y = - 65 -1.5y = -65 y = 43.33 student tkts x + y = 105 x + 43.33 = 105 x = 61.67 student tkts are you sure ...
January 14, 2011

Algebra
x = adult tkts y = student tkts 3x = value of adult tkts 1.5y = value of student tkts x + y = 105 3x + 1.5y = 250 solve these equation together for your answer post back if you need more help
January 14, 2011

8th grade math
not enough info to solve this,
January 13, 2011

Pre-Calculus
3. 30-60-90 special triangle draw this out to see that you need to find side a (shorter side) of triangle ABC 30-60-90 triangle have sides in the ratio of 1 : sqrt 3 : 2 (a : b : c) Since side b = 10 cos 30 = b/c = 10/c since ratio of b/c = sqrt 3/2 sqrt 3/2 = 10/c cross ...
January 13, 2011

Pre-Calculus
I think the tutors like you to post each problem as a separate post.
January 13, 2011

trigonometry
my trig book has tables in degrees and minutes for example, look-up sin 24 deg 40 min and sin 24 deg 50 min. cal. the correction and add to the smaller angle for sin, tan, sec (subtract the correction for cos, cot, csc) sin 24d 40' = .4173 sin 24d 50' = .4200 ...
January 13, 2011

3 G Math
9 x 8 x any number = 72 x any number 2 x 9 x 4 = 72 the second one the FINAL answer is 72 the first one will be higher if you multiply 72 by any other number but 1, because 72 x 1 = 72, then they will be equal but if any number is greater than 1, then the first will be higher ...
January 13, 2011

4th grade
you have to post the question you need help with
January 13, 2011

Geometry
I can't believe I didn't think to do it your way!!! so much easier to do AND understand that's why you are the tutor thank you I've learned so much from your posts! I wish I had you to ask questions when I was taking math.
January 13, 2011

Geometry
I don't understand what you are asking use this formula TA = 2Lw + 2Lh + 2wh use these dimensions 1st use, L = 2, w = 3, h = 4 then quadruple the dimensions to compare how the area changed 2nd use L = 8, w = 12, h = 16 (I quadrupled the dimensions for you) you can use any ...
January 13, 2011

Geometry
I'll do volume to show you V = L*w*h 1st example, L = 2, w = 3, h = 4 V = 2*3*4 V = 24 Quadruple each dimension, L = 2*4 = 8, w = 3*4 = 12, h = 4*4 = 16 V = 8*12*16 V = 1536 So, the volume went from 24 to 1536 1536/24 = 64 so 24*64 = 1536 So, if you quadruple the ...
January 13, 2011

geometry
Sum of measures of interior angles of a polygon of n sides = (n - 2)*180 deg. parallelogram = 4 sides so, n = 4 (4 - 2)*180 2*180 = 360 deg in a parallelogram can you answer this now?
January 13, 2011

Geometry
so, this means that you cannot have two obtuse angles
January 13, 2011

Geometry
there are 3 angles in a triangle that = 180 deg. an obtuse angle is > 90 deg but < 180 if you have two obtuse angles of 91 deg ea then, 180 - ( 91 + 91 )= ? so, what is the answer then
January 13, 2011

FAST MATH HELP
you posted this 2 times below please check there for an answer before posting again I answered this same question 2 times below where you asked the first time
January 13, 2011

To Helper
you're welcome
January 13, 2011

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