Tuesday

July 26, 2016
Total # Posts: 1,781

**maths**

(0.008)^x = 1/25 x log 0.008 = log 1/25 -4.828314 x = -3.218876 x = -3.218876/-4.828314 x = ?
*February 14, 2011*

**Math**

x^3 = 27 Take cube root of both sides x = 3 Because, 3 * 3 * 3 = 27 I'm not sure what your 2nd problem is. Is your problem, x^4 = 16 ? If so, x^4 = 16 Take the forth root of both sides x = +- 2 Because, 2 * 2 * 2 * 2 = 16 Or, -2 * -2 * -2 * -2 = 16 FYI, 4^3 = 4 * 4 * 4 = ...
*February 14, 2011*

**Math Trivia**

The web link provided gave the answer. I pasted it below. The calculation was done wrong. The 2 dollars should not be added to 27 but subtracted to get 25 dollars. Put in another way, $25 is with the owner of the Hotel, each of the 3 guests received $1 from the clerk, and he ...
*February 13, 2011*

**math**

Answered in previous post.
*February 13, 2011*

**math**

If I am picturing this correctly, a right triangle is formed, with the diagonal of 75' being the hypotenuse. x = one leg (vertical height) x + 15 = other leg (horizontal distance) Use the Pythagorean theorem, c^2 = a^2 + b^2 75^2 = x^2 + (x + 15)^2 Solve for x
*February 13, 2011*

**TRIG**

2 sin Î¸ + 3 = 2 2 sin Î¸ = -1 sin Î¸ = -1/2 Î¸ = ?
*February 13, 2011*

**algebre**

x = shortest side 2x = 2nd side x + 30 = 3rd side x + 2x + x + 30 = 102 Solve for x, and use to determine the dimensions as defined above
*February 13, 2011*

**math **

(7x + 4)(2x + 4) Use FOIL-First, Outer, Inner, Last First-7x * 2x = 14x^2 Outer-7x * 4 = 28x Inner-4 * 2x = 8x Last-4 * 4 = 16 Put together, 14x^2 + 28x + 8x + 16 Combine like terms, 14x^2 + 28x + 8x + 16 14x^2 + 36x + 16 All the problems you have posted are done the same way...
*February 13, 2011*

**math**

See your post with the detailed answer of how these type problems are done. All the problems you posted are done the same exact way. Time to get to work.
*February 13, 2011*

**math**

See your post with the detailed answer of how these type problems are done. All the problems you posted are done the same exact way. Time to get to work.
*February 13, 2011*

**math**

See your post with the detailed answer of how these type problems are done. All the problems you posted are done the same exact way. Time to get to work.
*February 13, 2011*

**math**

See your post with the detailed answer of how these type problems are done. All the problems you posted are done the same exact way. Time to get to work.
*February 13, 2011*

**math**

You don't state if the interest is simple or compounded. For simple interest, I = PRT (Interest = Principal*Rate*Time) I = 300 * 0.03 * 30 I = ?
*February 13, 2011*

**college Trig**

Triangle ACB, C = 70 deg, a = 70, b = 50 find side c Use Law of Cosines--Case III (Given two sides and the included angle) c^2 = a^2 + b^2 - 2ab cos C c^2 = 70^2 + 50^2 - 2(70)(50) cos 70 Solve for c
*February 13, 2011*

**algebra**

28x^2 - 196xy + 343y^2 7(x^2 - 28xy + 49y^2) 7(2x - 7y)(2x - 7y) 7(2x - 7y)^2
*February 13, 2011*

**finance**

I'm not sure either Ms. Sue after seeing your answer. I multiplied out 10yrs at your rate and your answer is closer. I have to think about this more.
*February 13, 2011*

**finance**

1.55 - .79 = .76 increase in 10 yrs 0.76/0.79 = 0.962025 = 96.2025% increase in 10 years 96.2025%/10 = annual growth rate
*February 13, 2011*

**math**

x = larger number y = smaller number xy = 50 x/y = 2 or x = 2y Substitute, x = 2y in xy = 50 2y * y = 50 2y^2 = 50 y^2 = 25 y = +- 5 To find x, Substitute y = +- 5 in either equation xy = 50 5x = 50 x = 10 -5x = 50 x = -10 Numbers are 10, 5 or -10, -5
*February 13, 2011*

**math**

1/4 + 3/10 First, find the common denominator, 20. 5/20 + 6/20 = ?
*February 13, 2011*

**statistics**

y = 100 + 1.2x 130 = 100 + 1.2x Solve for x 30 = 1.2x x = 30/1.2 = ?
*February 13, 2011*

**math**

Please check your 1st post for an answer before reposting. This question was answered earlier today.
*February 12, 2011*

**For bobpursley**

I will email as soon as I can. My email is not working at this moment and I don't know why. My son-in-law is looking into it right now.
*February 12, 2011*

**algebra**

See your 1st post below.
*February 12, 2011*

**algabra**

For multiplication, the rule is a(bc) = (ab)c In numbers, this means 2(3×4) = (2×3)4 Can you do your problem now?
*February 12, 2011*

**math**

(8,-4) and (-7,9). Midpoint =(x1 + x2)/2, (y1 + y2)/2 Mx = (8 + -7)/2 = 1/2 = 0.5 My = (-4 + 9)/2 = 5/2 = 2.5 Midpoint (0.5, 2.5)
*February 12, 2011*

**algebra**

(6/-2)/-1/4 = -3 * -4/1 = 12 Division is the same as multiplying by the reciprocal.
*February 12, 2011*

**algebra**

5p + 15 What factors do both expressions have in common, 5. 5p + 15 = 5(p + 3)
*February 12, 2011*

**algebra**

2/9 * 2y/2y = 4y/18y
*February 12, 2011*

**Algerbra**

You're welcome :)
*February 12, 2011*

**Algerbra**

f(x) = -4x - 3 The slope-intercept form of an equation, where m = slope and b = y-intercept. y = mx + b Since your equation is already in the slope-intercept form, y = mx + b y = -4x - 3 Slope m = -4 y-intercept b = -3
*February 12, 2011*

**Algebra**

Look below "Post Answer" button. See "Related Questions", click the first link "Algebra". This almost exact question is answered there.
*February 12, 2011*

**Algebra**

Check your equation. I think it should be y = -1777x + 27,153 You have +1777x
*February 12, 2011*

**Algebra 1**

y = 3x - 1 y = -x + 1 Find points for each equation, then plot the points for each, draw a line connecting these points for each equation. The point of intersection is the solution. y = 3x - 1 x = 0, y = -1 x = -1, y = -4 x = 1, y = 2 x = 1/2, y = 1/2 So, you would plot the ...
*February 12, 2011*

**geometry**

tan 8 degrees = 0.1405 0.1405 * 100 = 14.05% grade
*February 12, 2011*

**Algebra**

You're welcome :)
*February 12, 2011*

**Algebra**

D = RT (Distance = Rate * Time) 120 = rate of Train B T = time of Train B 120T = distance of Train B 100 = rate of Train A T + 0.25 = time of Train A (5:25 - 5:10 = 15 min = 60/15 = 0.25 h) 100(T + 0.25) = distance of Train A Distances are equal 120T = 100(T + 0.25) 120T = ...
*February 12, 2011*

**algebra **

Slope = rise/run = 8/29 = ?
*February 12, 2011*

**Biology**

I would think the volume of a cylinder formula, as long as the cup diameter is uniform from top to bottom (not an older type cup where it is wider at the top than at the bottom of the cup).
*February 12, 2011*

**algebra**

w = width 2w + 1 = length P = 2w + 2L 302 = 2w + 2(2w + 1) Solve for w, the width. length = 2w + 1
*February 12, 2011*

**calculus**

To find the slope of the tangent line at a point means to find the derivative of f(x). f(x) = 3 - 5x f' = 0 - 5 f' = -5 Then, normally, you would plug in the given point, (-1, 8), to find the slope. But since f' = 5 with no variable x, for instance, there is ...
*February 11, 2011*

**algebra**

Answered below. Please don't repost without checking your original post first for an answer. Also, tutors volunteer their time. You must have patience. If your question is not answered after 4 hours or so, then repost your question.
*February 11, 2011*

**math**

75x^4 + 35x^3 - 10x^2 See your first post below for an example of how this is done. Hint, factor out 5x^2 first, then factor the remaining expression. You will never learn without practice :)
*February 11, 2011*

**algebra**

12y^3 + 48y^2 + 24y You try now. Hint, factor out 12y first.
*February 11, 2011*

**algebra**

12y^3 + 48^2 + 24y Are you sure this is the equation? If so, A = Lw Factor, 12y^3 + 48^2 + 24 12(y^3 + 2y + 192) L = 12 m^2 w = (y^3 + 2y + 192) m^2
*February 11, 2011*

**math**

81x^2 - 54xy + 9y^2 9(9x^2 - 6xy + y^2) 9(3x - y)(3x - y) 9(3x - y)^2
*February 11, 2011*

**algebra**

25y^2 - 4z^2 A = Lw Factor, 25y^2-4z^2 (5y - 2z)(5y + 2z) L = (5y - 2z) m^2 w = (5y + 2z) m^2
*February 11, 2011*

**math**

GCF = 3x^4 3x^4(5x - 3)
*February 11, 2011*

**Math**

Triangle Area = 1/2 bh 60 = 1/2 15b 120 = 15b b = 8 base = 8 height = 15 s = sides The height h of the isosceles triangle h = (sqrt(s^2 - 1/4 b^2)) 15 = (sqrt(s^2 - 1/4 8^2)) 15 = (sqrt(s^2 - 1/4 64)) 15 = (sqrt(s^2 - 16)) Square both sides 225 = s^2 - 16 s^2 = 241 s = 15.52 ...
*February 11, 2011*

**algebra**

(x + 2)/13 = 7/13 Multiply both sides by 13 x + 2 = 7 x = 5
*February 11, 2011*

**Algebra**

In 1995--64.8 yrs In 1999--67.2 yrs To write the equation, use the points 1999 - 1995 = 4 yrs 1995--(0, 64.8) 1999--(4, 67.2) Equation through two points, y - y1 = (y2 - y1)/(x2 - x1) * (x - x1) y - 64.8 = (67.2 - 64.8)/(4 - 0) * (x-0) y - 64.8 = 2.4/4 x y - 64.8 = 0.6x y = 0....
*February 11, 2011*

**calculus please help**

f(x) = -1/2(x^2) Step 1 f(x + h)= -1/2(x + h)^2 f(x + h)= -1/2(x^2 + 2xh + h^2) f(x + h)= -1/2 x^2 - xh - 1/2 h^2 Step 2 f(x + h)-f(x)= -1/2 x^2 - xh - 1/2 h^2 - (-1/2 x^2) f(x + h)-f(x)= -1/2 x^2 - xh - 1/2 h^2 + 1/2 x^2 f(x + h) - f(x) = -xh - 1/2 h^2 f(x + h) - f(x) = h (-x...
*February 11, 2011*

**Calculus **

The derivative of a constant is 0. f' = 0
*February 11, 2011*

**Calculus**

Example of 4 step process f(x) = -1/2(x^2) Step 1 f(x + h)= -1/2(x + h)^2 f(x + h)= -1/2(x^2 + 2xh + h^2) f(x + h)= -1/2 x^2 - xh - 1/2 h^2 Step 2 f(x + h)-f(x)= -1/2 x^2 - xh - 1/2 h^2 - (-1/2 x^2) f(x + h)-f(x)= -1/2 x^2 - xh - 1/2 h^2 + 1/2 x^2 f(x + h) - f(x) = -xh - 1/2 h...
*February 11, 2011*

**pre- algebra**

Sorry, John I was rushing to leave. I said to add but I then I had a typo. Thanks to MattsRiceBowl for catching this.
*February 10, 2011*

**pre- algebra**

6 * 6 * 6 * 6 * 6 * 6 * 6 * 6 = ? Or use a calculator
*February 10, 2011*

**pre- algebra**

6^4 * 6^2 = 6^8 (add exponents) I'll leave it to you to cal. 6^8
*February 10, 2011*

**math**

Largest rectangle is a square P = 2w + 2L 68 = 2w + 2L 34 = w + L 34/2 = 17 34 = 17 + 17 Dimension = 17 x 17
*February 10, 2011*

**Math**

-4/0 = undefined You CANNOT divide by 0.
*February 10, 2011*

**Math**

slope = undefined
*February 10, 2011*

**algebra**

w = width w + 10 = length Area = 144 A = Lw 144 = w(w + 10) Solve for w
*February 10, 2011*

**algebra**

Solve the following, 14 + x + 4 + 2x - 3 >= 57
*February 10, 2011*

**Math**

negative * positive = negative Same for division. (√2/2)/(-√2/2) = -1 If this isn't your complete problem, you must have a mistake someone.
*February 10, 2011*

**math**

27m^2 - 36 + 12 Can't be factored, but can be simplified. 27m^2 - 24
*February 10, 2011*

**math**

10s^2 + 4st - 6t^2 2(5s^2 + 2st - 3t^2) 2(5s - 3t)(s + t)
*February 10, 2011*

**math**

y^2 - y + 0 = y(y - 1)
*February 10, 2011*

**Math**

5y + 3 = 2y - 3x + 5 Subtract 2y from both sides 5y - 2y + 3 = 2y - 2y - 3x + 5 3y + 3 = -3x + 5 3y = -3x + 2 y = -x + 2/3 y = 2/3 - x
*February 10, 2011*

**geometry**

Similar figures have corresponding sides, areas and perimeters in the same proportion. 32 : 288 = 4 : x 32/288 = 4/x cross multiply 32x = 1152 x = ?
*February 10, 2011*

**math**

A = Lw 12y^3+48y^2+24y Factor into 2 factors. 1st factor = w 2nd factor = L
*February 10, 2011*

**Math**

Not solve, simplify (√(2)/2) / (-2/√(2)) (sqrt(2))/2 * (sqrt(2))/2 = -2/4 = -1/2 I don't know what this means in regards to the above. (simplify part) "the answer is 1 in other words it's tan(π/4)= 1"
*February 10, 2011*

**math--incomplete problem**

Your problem is incomplete.
*February 10, 2011*

**Algebra--incomplete problem**

What is your question?
*February 10, 2011*

**Math**

10y = 5x + 10 y = (5x + 10)/10 y = 5x/10 + 10/10 y = 1/2 x + 1
*February 10, 2011*

**math**

Should be 5 : 8 = 15 : x 5x = 120 x = ?
*February 10, 2011*

**math**

5 : 8 = 15 : 8 5/8 = 15/x Cross multiply 5x = 270 x = ?
*February 10, 2011*

**Math-True OR False Please Help!**

the y-intercept of f(x) is an x-intercept of f^-1 Look at the example I did for you. What is the y-intercept of f(x)? What is the x-intercept of f^-1? Are they the same? If yes, true. If not, false.
*February 10, 2011*

**Math-True OR False Please Help!**

This exact question was answered yesterday. Are you Sam too? Try an example to see if this is true. f(x) = 3x - 1 So, f(x) has y-intercept = -1 To find inverse of f(x), y = 3x - 1 x = 1/3 y + 1/3 y = 1/3 x + 1/3 f^-1 = 1/3 x + 1/3 To find x-intercept, y = 1/3 x + 1/3 0 = 1/3 x...
*February 10, 2011*

**math**

0.0725 * 20 = 1.45 20.00 + 1.45 = ?
*February 10, 2011*

**???---English **

If you would like an answer to your question in a timely manner please follow directions. Place your school subject name in the School Subject box.
*February 10, 2011*

**Math**

Please don't repost a question without checking your prior post for an answer. Your check was answered the first time you asked.
*February 10, 2011*

**Math**

20% = .20 Savings = 0.20 * 45.87 Savings = ?
*February 10, 2011*

**MATH**

1/2 ball = hemisphere d = 3 r = 1/2 d = 1.5 V = 2/3 pi r^3 V = 2/3 (3.14)(1.5)^3 V = 2/3 (3.14)(3.375) V = ?
*February 10, 2011*

**Calculus**

derivative of 4e^x+x^3 Dx(e^x) = e^x Dx(x^3) = 3x^2
*February 10, 2011*

**math 3rd grade**

How about a straight angle (a line)?
*February 10, 2011*

**math**

Reposting your question will NOT get you an answer faster. You must have patience. Tutors volunteer their time. Maybe a tutor familiar with your problem is not here. Please stop clogging the board.
*February 10, 2011*

**fin 200-kim your problem is incomplete**

What is your question?
*February 10, 2011*

**Math**

x = total 0.70 x = 290,000 x = 290,000/0.70 x = 414,285.70
*February 10, 2011*

**Math**

(3cd^4)(-2c^2) There is nothing to solve. Multiplying, (3cd^4)(-2c^2) = -6c^3d^4
*February 10, 2011*

**Math--Diane check your problem**

What is ?
*February 10, 2011*

**math**

You're welcome. :) If you get stuck, post your work and someone will help. I'll check your answer if you would like.
*February 10, 2011*

**math**

See your first post. Do this problem the same way.
*February 10, 2011*

**math**

64 mph, 15 min = .25 hr (15/60 = .25) D = RT (Distance = Rate * Time) R = 64, T = .25 .25 * 64 = ?
*February 10, 2011*

**Math**

m = Margaret's age m + 4 = Kate's age m + 7 = Margaret's age in 7 yrs m + 4 + 7 = m + 11 = Kate's age in 7 yrs m + 7 + m + 11 = 70 2m + 18 = 70 2m = 52 m = 26 Margaret is 26 Kate is 30
*February 10, 2011*

**Graphing(I Truly Need Help) :)**

If you google function graphs or something similar, I'm sure there is a website where you can input your function and the graph is produced.
*February 10, 2011*

**MAth(Someone please help)**

If you google function graphs or something similar, I'm sure there is a website where you can input your function and the graph is produced.
*February 10, 2011*

**math**

If you are Katherine, this question was answered in your 1st post last night. Please check your prior post for an answer before reposting. I pasted the answer below. Ratio = Boys : Girls = 4 : 3 4x = number of boys 3x = number of girls 4x - 6 = 3x x = 6 4x = number of boys = 4...
*February 10, 2011*

**math**

I showed you step by step how to do this. Now it's your turn to try to do this problem.
*February 10, 2011*

**math**

130 mi in 3.5 hrs 130 mi * 5280 ft/mi = 686,400 feet 3.5 hr * 60 min/hr = 210 min Rate = Distance/Time 686,400/210 = 3268.571 feet/min
*February 10, 2011*

**Algebra 1**

Is line AC perpendicular to line BD Two lines are perpendicular if their slopes are negative reciprocals of each other (m1 * m2 = -1). I'll leave the work for finding these lines to you. AC--through (-2,1), (5,7) y = 6/7 x + 19/7 slope m1 = 6/7 BD--through (3,3), (0,5) y...
*February 10, 2011*

**math 2**

When two figures are similar, the reduced ratio of any two corresponding sides is called the scale factor of the similar figure. Example One side of a square is 6 and the corresponding side of a similar square is 3. The ratio is 6 : 3 or 6/3 = 2. The scale factor is 2 : 1.
*February 10, 2011*

**math**

Post an example problem with directions and someone will help you.
*February 10, 2011*