Friday
December 9, 2016

# Posts by Helper

Total # Posts: 1,806

Math
Solve for ? Solving for x, 6x + 5y = 15 6x = 15 - 5y x = (15 - 5y)/6 Solving for y, 6x + 5y = 15 5y = 15 - 6x y = (15 - 6x)/5
February 5, 2011

No, you are not correct. But, you almost had it! To compute the actual increase in profit, first plug in 5, then plug in 6. The difference between f(5) and f(6) is the actual. p(x)= 3x^2 - 5x + 2 p(5) = 3(5)^2 - 5(5) + 2 = 52 p(6) = 3(6)^2 - 5(6) + 2 = 80 p(6) - p(5) = 80 - 52...
February 5, 2011

y=sqrt 2x^2 +1 at the point (2,3). No, you are not correct. First, you need to find the derivative of, (sqrt(2x^2 + 1)) dy/dx = 2x(2x^2 + 1)^(-1/2) This is the slope of the tangent line at P. Now plug in P(2,3) 2x(2x^2 + 1)^(-1/2) 2(2)(2(2^2) + 1)^(-1/2) 4(8 + 1)^(-1/2) 4 * (9...
February 5, 2011

Math
dy/dx 2x^(1/2) 2 * 1/2 x^(1/2 - 2/2) 2/2 x^(-1/2) = x^(-1/2) = 1/(sqrt(x))
February 5, 2011

math
Correct
February 5, 2011

math
Correct
February 5, 2011

MATH
Please learn to type exponents as ^2 (means to the second power) (4^(-1)m^(-2)n^(-3)/(2mn)^(-3)) (1/4 1/m^2 1/n^3)/(1/(8m^3n^3)) (1/(4m^2n^3))/(1/(8m^3n^3)) (8m^3n^3)/(4m^2n^3) = 2m
February 5, 2011

Calculus
If you put (-1)^(4/3) in a calculator you get = -0.5 - 0.866025404 i (I used google calculator) If you put in "cube root (-1)" you get -1. -1 * 4 = -1 Using, (-1)^(4/3) = -1 3/8 (8)^(4/3) - 3/8 (-1)^(4/3) 3/8 (16) + 3/8 6 + 3/8 = 51/8 So, the book answer of 51/8 is ...
February 5, 2011

Algebra
I can't graph this for you. What do you not understand about graphing? Pick values for x and solve for y. After you get a handful of x,y values, plot the points for your graph.
February 4, 2011

algebra
3³+53*(39)-(2+5*9) 27 + 2067 - (2 + 45) 2094 - 47 = 2047
February 4, 2011

Algebra
Please check your 1st post. Also, please have patience. Tutors volunteer their time answering questions. Sometimes an answer is given very quickly and other times it could take a few hours.
February 4, 2011

Accounting ethics
Have you googled "How to CONDUCT a stakeholder analysis"? I just did and there are many good links. Whether these are helpful, only you would know. I can't post links here, otherwise I would. Good luck.
February 4, 2011

math
x = hourly rate 40x + 12x = 520 Solve for x
February 4, 2011

Algebra
Symmetric to y-axis if an equivalent equation is obtained when x is replaced by -x. It is symmetric to the y-axis, not x-axis.
February 4, 2011

Algebra
4y^4 + 24x^2 = 28 Symmetric to x-axis if an equivalent equation is obtained when y is replaced by -y. 4y^4 + 24x^2 = 28 4(-y)^4 + 24x^2 = 28 4y^4 + 24x^2 = 28 Since, the two equations are equivalent, the graph is symmetric to the x-axis. Symmetric to y-axis if an equivalent ...
February 4, 2011

Algebra
You need parentheses for the 2nd equation. Is this, y = 1/(x^2 + 5) Or, y = 1/(x^2) + 5
February 4, 2011

algebra
-7(x+5)(x+8) Use FOIL to expand (multiply out). What do you not understand?
February 4, 2011

math
This is very simple and quick to graph. Have you tried to graph these? What don't you understand?
February 4, 2011

math
Tutors do not do your homework. The only way you will learn is by trying to solve these yourself. See your first post/problem below. I worked out one problem in detail. Follow this example to do all these problems. If you get stuck post your work and someone will help you.
February 4, 2011

math
See your first post. Follow that example to complete this problem. Same concept, different numbers.
February 4, 2011

math
3x - 4y = 22 2x + 5y = 7 To eliminate variable x, Multiply by -2 (3x - 4y = 22) Multiply by 3 (2x + 5y = 7) Add equations -6x + 8y = -44 6x + 15y = 21 0 + 23y = -23 23y = -23 y = -1 To find x, substitute y = -1, in 2x + 5y = 7 2x + 5y = 7 2x - 5 = 7 2x = 12 x = 6 x = 6, y = -1
February 4, 2011

Algebra
What is the question?
February 4, 2011

arithmetic
Convert to inches, then use a ratio. 5'2' = 62" 3' = 36" 3'5" = 41" 62:36 = x:41 62/36 = x:41 Cross multiply and solve for x.
February 4, 2011

Geometry
TU=4x-1, UB=2x-1, TB=5x TU + UB = TB 4x - 1 + 2x - 1 = 5x Solve for x. Substitute the value you find for x in TU (4x - 1) to find the measure of TU.
February 4, 2011

Math
f(x) = x^2 + 6x f' = 2x + 6
February 4, 2011

Algebra
b^3 = 1331 b = 11 This problem is asking for the cube root of 1331. ( b * b * b = 1331 ?) There is really nothing to solve. Just like the square root of 100. You either know the answer off hand, approximate to get the answer, use trial an error, OR use a calculator.
February 4, 2011

Math
Perimeter p = 2w + 2L L = length (you called height) 0.62L = width p = 3' p = 2w + 2L 3 = 2L + 2(0.62L) 3 = 2L + 1.24L Solve for L (height)
February 4, 2011

math
February 3, 2011

math
x = frogs Jen caught 4x = frogs Lisa caught x + 4x = 25 Solve for x
February 3, 2011

COLLEGE ALGEBRA
February 3, 2011

COLLEGE ALGEBRA
February 3, 2011

algebra
If this is your problem (5x^4 + 3x^2 - 2x) - (-5x^4 - 3x^2 + 9x) Answer is 10x^4 + 6x^2 - 11x
February 3, 2011

math
x = number of necklaces 2x = number of earrings 16 + x + 2x = 43 solve for x
February 3, 2011

algebra
D = RT 88 = Rate of Train B T = Time of Train B 88T = Distance of Train B 80 = Rate of Train A T + .5 = Time of Train A (8:40 - 8:10 = 30 min = .5 h) 80(T + .5) = Distance of Train A Since distances are equal 80(T + .5) = 88T 80T + 40 = 88T 8T = 40 T = 5 Train B will catch up ...
February 3, 2011

math
What do you mean last step? That is the answer. You can't add -1/4 + (sqrt(3))/4
February 3, 2011

Algebra-still need some help
Is this a question?
February 3, 2011

Algebra-still need some help
For the domain, the denominator can't equal zero. -2x - 5 = 0 -2x = 5 x = -5/2 So, x cannot equal -5/2 All x not equal to -5/2 For the numerator, you cannot have a negative inside the square root. x + 6 >= 0 x >= -6 All x >= -6
February 3, 2011

Math
Please see answer I pasted below. This question was answered by Damon yesterday (and today, at least once already). math - Damon, Wednesday, February 2, 2011 at 7:40pm 1 1 1 1 1 2 1 1 3 assuming at least 3 greeting card choices
February 3, 2011

math
The question is? 4x + 5 + 29 = 4x + 34
February 3, 2011

math
x = size of woman's head 8x = size of man's head 8x = 50 x = ?
February 3, 2011

Perimeter and area
w = width = 9, L = length Area = Lw 81 = 9L L = 9 Perimeter P = 2w + 2L w = 9, L = 9 P = 2(9) + 2(9) P = ?
February 3, 2011

algebra
Are you adding these two equations? If so, 5x^4 + 3x^2 - 2x -5x^4 - 3x^2 + 9x ------------------- 0 + 0 + 7x The answer is 7x
February 3, 2011

math
Link doesn't work. There is a space after the last /.
February 3, 2011

Math
(5x^2 - 4x)(3x^2 + 2x) Use FOIL to expand -8x^2 - 2x^3 + 15x^4 15x^4 - 2x^3 - 8x^2
February 3, 2011

functions
Functions? This is a geometry problem. The ladder up against the wall forms a right triangle. x = base x + 5 = opposite side 18 = hypotenuse Using the Pythagorean theorem, x^2 + (5 + x)^2 = 18^2 Solve for x 5 + x = how far up the blding the ladder reaches.
February 3, 2011

geometry
xz = 72 xy = 5x + 3 yz = 8x - 9 5x + 3 + 8x - 9 = 72 13x - 6 = 72 13x = 78 x = 6 So, for y to be the midpoint of xz, xy = yz 5x + 3 = 8x - 9 x = 6 5(6) + 3 = 8(6) - 9 30 + 3 = 48 - 9 33 not = 39 y is not the midpoint
February 3, 2011

Math
You're welcome :)
February 3, 2011

Math
Plan A: Salary \$750 + .10 of sales Plan B: Salary \$1,000 + .08 of sales > \$2,000 x = dollar amt of sales 750 + .10x > 1000 + .08(x - 2000) 750 + .10x > 1000 + .08x - 160 750 + .10x > 840 + .08x 0.02x > 90 x > 4500 Plan A better when sales > \$4500
February 3, 2011

geometry
Not enough info. I don't have the figure to look at. Where is JN? Where is JL? Where is KL? Is this a triangle, a square, etc? Without a detailed description, your question cannot be answered.
February 3, 2011

Math
52/16 = 105/28 The concept is the same as reducing fractions. Do you know how to reduce fractions? Example: 6/12 = 1/2 in lowest terms 25/15 = 5/3 in lowest terms This is what you need to do to your problem.
February 3, 2011

Please see answer I pasted below. This question was answered by Damon yesterday. math - Damon, Wednesday, February 2, 2011 at 7:40pm 1 1 1 1 1 2 1 1 3 assuming at least 3 greeting card choices
February 3, 2011

algebra 1
x = miles Candice drove 2x = miles Marcus drove x + 2x = 66 = miles driven together 3x = 66
February 3, 2011

algebra
FYI-"algabra" is not how you spell algebra. 3x^2- 12x - 24 = 0 This equation cannot be solved by factoring. Use the Quadratic Formula, or the method of completing the square. Here is the quadratic formula. x = (-b +- (sqrt(b^2 - 4ac)))/2a 3x^2 - 12x - 24 = 0 a = 3, b...
February 3, 2011

Math
You question is not clear. Are all these age problems based on the 10 year old, 55 year old and 75 year old or are these separate problems? Are these ages three different people? For example, "at my age of 55, in years, how old was the older person of 75 when I was born?&...
February 3, 2011

Physics
February 2, 2011

physics
See the 3rd link below under Related Questions. A similar question was answered for (a).
February 2, 2011

math
6 = 14 - 2x add -14 to both sides 6 + -14 = 14 + -14 - 2x -8 = -2x Divide both sides by -2 -8/-2 = -2x/-2 4 = x x = 4
February 2, 2011

physics
February 2, 2011

math
Pay attention. Do as many practice problems as you can a night. If you do not understand a certain math concept, ask for help. Practice, study and repeat as needed.
February 2, 2011

math
D = RT (Distance = Rate x Time) R = D/T 35 min = .58 hour (35/60) D = 25 mi, T = .58 h R = 25/.58 = 43.10 mph to nearest mph = 43 mph
February 2, 2011

math
Don't listen to emma. She/he is wrong.
February 2, 2011

math
22-2[5+3(6-1)] Remove the inner most parentheses first 22-2[5+3(5)] Perform the inner most multiplication next 22 - 2[5 + 15] Do addition inside parentheses 22 - 2(20) Perform theultiplication 22 - 40 Subtract -18
February 2, 2011

physics
You're welcome :)
February 2, 2011

physics
See first link below under Related Questions. A very similar problem was answered.
February 2, 2011

math
5z+10(-z+14)=95 5z - 10z + 140 = 95 -5z = -45 z = ?
February 2, 2011

alg and trig
If you mean, (you should use parentheses) 6x^3-5x^2+15x+5 / (2x^2-x+3) Use polynomial long division, Here's the answer to check to your long division, 6x^3 - 5x^2 + 15x + 5/(2x^2 - x + 3)
February 2, 2011

math
If you mean, (5x^3 * y^4)/(14x^5 * y^-8)= 5y^12/(14x^2)
February 2, 2011

algebra
Your problem is not clear. What are you dividing?
February 2, 2011

math
20 + 40 = 60
February 2, 2011

math
Square X, s = side Area, A = s^2 100 = s^2 Take square root of both sides 10 = s Square X, s = side Perimeter, P = 4s s = 10 P = 4(10) P = 40 Square Y, s = side Perimeter of Sq. Y = 1/2 Sq. X Perimeter of Sq X = 40, P = 1/2 (40) = 20 P = 4s 20 = 4s s = 5 Square Y, side = s ...
February 2, 2011

math
Yes, Damon is right. A(5) is the total value. I meant to put, \$18,500 + 4610.26 Interest = \$23,110.26 after 5 years
February 2, 2011

math
\$18,500 at 4.5% compounded semiannually for 5 years A(t) = P(1 + r/n)^nt A(5) = 18500(1 + 0.045/2)^(2(5)) A(5) = 18500(1 + 0.0225)^10 A(5) = 18500(1.0225)^10 A(5) = 18500(1.24920) A(5) = 23110.26 interest 18,500 + I = total value after 5 yrs
February 2, 2011

Algebra
f(x)=(4x-1)/(x+7) y = (4x-1)/(x+7) Rewrite as: y = (4x)/(x+7)- 1/(x+7) Multiply both sides by x+7: (x + 7)y = 4x - 1 Expand out terms of the left hand side: xy + 7y = 4x - 1 xy - 4x = -7y - 1 x(y - 4) = -7y - 1 Divide both sides by y - 4: x = (-7y - 1)/(y - 4) f^-1 = (-7x - 1...
February 2, 2011

Math geometry
A line that bisects an angle divides it into two congruent parts. So if ray AH bisects <GAB, then angle GAH = angle BAH ? You are saying <GAH is acute and <BAH is obtuse? Does the problem state ray AH bisects <GAB or are your looking at a picture and YOU are making...
February 2, 2011

Math geometry
February 2, 2011

Algebra
Ignore my answer. I did not notice that one measurement is in feet. I compared inches to feet, which you cannot do.
February 2, 2011

Algebra
Set up a ratio. 10 : 100 = 10/100 = 1/10 The model is 1/10 the size of the Endeavour.
February 2, 2011

,Math 7
You're welcome :)
February 2, 2011

,Math 7
Question 2 You are correct. Megan starts with \$24.75. She should leave at 11:15. Look at the part under question 4 ABOVE where I say "To check this".
February 2, 2011

The answer is 2 < x < 4 I don't know how to solve this. I have tried various web sites for help. I used an online calculator for the answer but the calculator does not have the steps to solve. I've been trying this since you posted yesterday. Hoping a math tutor ...
February 2, 2011

math
y = 10h if h = number of hours worked then, \$10
February 2, 2011

Math geometry
You're welcome :)
February 2, 2011

Math geometry
The midpoint of BC is M(-10,-16) B(-1,8) C = ? xm = 1/2(x1 + x2), ym = 1/2(y1 + y2) -10 = 1/2(-1 + x2) -20 = -1 + x2 -19 = x2 -16 = 1/2(8 + y2) -32 = 8 + y2 -40 = y2 C(-19, -40) check my math
February 2, 2011

Set-up equations 1) x - 7 + 3 + 6 - 8 + 1 - 6 = 3 x + 10 - 21 = 3 x - 11 = 3 x = 13 2) x - 12.00 + 15.00 - 7.00 - 8.50 + 8.00 + 2.00 = 22.25 You solve 3) Miguel x + 15 - 4 + 6 - 17 + 22 + 14 = 40 Yoshi x + 12 - 4 + 33 - 7 = 40 You solve 4) 3:35--plane 2:00--less 2h 1:35--check...
February 2, 2011

math
Arithmetic sequence a, a + d, a + 2d, a + 3d, ...a +(n - 1)d 1)a3 = 10, a7 = 20 Since these are 4 places apart (7 - 3 = 4) a7 = a3 + 4d 20 = 10 + 4d 10 = 4d d = 10/4 = 2.5 So, the common difference, d = 2.5 To find the 1st term a, a3 = a + 2d 10 = a + 2(2.5) 10 = a + 5 a = 5 2...
February 2, 2011

algebra
3x^3-2x^2y-8xy^2 x(3x^2 - 2xy - 8y^2) x(x - 2y)(3x + 4y)
February 2, 2011

Psych
I think Ms. Sue said this. Where are the quotes?
February 2, 2011

Is this a test? The tutors will not complete your homework for you. The tutors will check or offer comments on YOUR work.
February 2, 2011

Algebra
This isn't a question. This is a statement, telling you why a solution to a word problem should be checked to the original wording of the problem versus the equation written for the problem. This is because the equation, derived from the wording of the problem, could be ...
February 2, 2011

algebra
If x = -70 -x = 70 Think of '-' meaning -1 -1x = 70 Divide both sides by -1 -1x/-1 = 70/-1 x = -70
February 2, 2011

Math
You're welcome :)
February 2, 2011

Math
80% = 30 .80x = 30 x = 30/.80 x = 37.5 total games 20% of 37.5 = 7.5 games lost 30 wins 7.5 lost 37.5 total games Not sure what you are trying to do in Excel.
February 2, 2011

Physics
See links below under Related Questions. This almost exact problem was answered.
February 2, 2011

Algebra
the quotient of 12 and the number, x 12/x = quotient x = -3 12/-3 = ?
February 2, 2011

Calculus
A ball is shot straight up into the air with initial velocity of 47 ft/sec Free fall, s in ft, t in sec s = s0 + v0t - 16t^2 height, s0 = 0 velocity, v0 = 47 s = 0 + 47t - 16t^2 s = 47t - 16t^2 Instantaneous velocity, v v = ds/dt = v0 - 32t v = 47 ft/sec v = 47 - 32t To find ...
February 2, 2011

Math
360 deg = 1 revolution 1 min = 60 sec 120/360 = 1/3 rev/sec 1/3 per/s * 60 sec/min = ?
February 2, 2011

College Algebra
3x^2- 12x - 24 = 0 Solve the quadratic equation by completing the square: Divide both sides by 3: x^2 - 4x - 8 = 0 Add 8 to both sides: x^2 - 4x = 8 Add 4 to both sides: x^2 - 4x + 4 = 12 Factor the left hand side: (x - 2)^2 = 12 Take the square root of both sides: |x - 2| = 2...
February 2, 2011

MATH
Please don't type in all caps. It is rude. On the internet, all caps is equivalent to shouting. 21x^7 and 147x^9 LCM is 21x^7
February 1, 2011

geometry
You need to draw right triangle ABC. Angle A (vertex angle) = 3 deg side b (base) = 60 mi side c = hypotenuse side a (distance of climb) = unknown tan A = op/hyp = a/b = a/60 tan 3 = a/60 0.0524 = a/60 60(0.0524) = a 3.144 mi = a So the plane climbed 3.144 miles To find how ...
February 1, 2011