# Posts by Helper

Total # Posts: 1,842

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 ...

algebra

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 :)

algebra
12y^3 + 48y^2 + 24y You try now. Hint, factor out 12y first.

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

math
81x^2 - 54xy + 9y^2 9(9x^2 - 6xy + y^2) 9(3x - y)(3x - y) 9(3x - y)^2

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

math
GCF = 3x^4 3x^4(5x - 3)

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 ...

algebra
(x + 2)/13 = 7/13 Multiply both sides by 13 x + 2 = 7 x = 5

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....

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...

Calculus
The derivative of a constant is 0. f' = 0

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...

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.

pre- algebra
6 * 6 * 6 * 6 * 6 * 6 * 6 * 6 = ? Or use a calculator

pre- algebra
6^4 * 6^2 = 6^8 (add exponents) I'll leave it to you to cal. 6^8

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

Math
-4/0 = undefined You CANNOT divide by 0.

Math
slope = undefined

algebra
w = width w + 10 = length Area = 144 A = Lw 144 = w(w + 10) Solve for w

algebra
Solve the following, 14 + x + 4 + 2x - 3 >= 57

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.

math
27m^2 - 36 + 12 Can't be factored, but can be simplified. 27m^2 - 24

math
10s^2 + 4st - 6t^2 2(5s^2 + 2st - 3t^2) 2(5s - 3t)(s + t)

math
y^2 - y + 0 = y(y - 1)

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

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 = ?

math
A = Lw 12y^3+48y^2+24y Factor into 2 factors. 1st factor = w 2nd factor = L

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"

math--incomplete problem

Algebra--incomplete problem

Math
10y = 5x + 10 y = (5x + 10)/10 y = 5x/10 + 10/10 y = 1/2 x + 1

math
Should be 5 : 8 = 15 : x 5x = 120 x = ?

math
5 : 8 = 15 : 8 5/8 = 15/x Cross multiply 5x = 270 x = ?

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.

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...

math
0.0725 * 20 = 1.45 20.00 + 1.45 = ?

???---English

Math

Math
20% = .20 Savings = 0.20 * 45.87 Savings = ?

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 = ?

Calculus
derivative of 4e^x+x^3 Dx(e^x) = e^x Dx(x^3) = 3x^2

How about a straight angle (a line)?

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.

fin 200-kim your problem is incomplete

Math
x = total 0.70 x = 290,000 x = 290,000/0.70 x = 414,285.70

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

What is  ?

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

math
See your first post. Do this problem the same way.

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

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

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.

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.

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...

math
I showed you step by step how to do this. Now it's your turn to try to do this problem.

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

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...

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.

math

algebera
w = width 2w + 3 = length P = 2w + 2L 30 = 2w + 2(2w + 3) Solve for w, the width. 2w + 3 = length

Math
w = width 2w + 1 = length P = 2w + 2L 302 = 2w + 2(2w + 1) Solve for w, the width. length = 2w + 1

algebra-incomplete problem
Interesting, but what is your question?

geometry
What is your question? I will find EH for you. Rectangle ABCD, AB = 10, BC = 6, CD = 10, AD = 6 Similar figures The ratio of the lengths of their corresponding sides are equal. Ratio of AD : AB = EH : EF 6/10 = EH/25 150 = 10EH EH = 15

urgent alg 1
(2t - 8t)+ (8t + 9t) 2t - 8t + 8t + 9t 2t + 9t = 11t (t +8t ) + (-3t ) t + 8t - 3t 9t - 3t = 6t

What does this part mean? Laura helps, they get the job done in 5 1 2 hours. Please fix.

geometry
This is geometry? LCM of 5, 8, and 10 is 40. Shortest length of string = 40 cm Is this what you need?

math
Also, please use * for the multiplication sign. Using "x" is confusing since "x" is a variable.

math
You must use parentheses. Is this your problem? |(45 - 27)/(3x(5-8))|?

math
8 = (4 * 4) - 9 + 1 8 = (10/2) + 5 - 2 8 = (2 + 8)/5 + 6 Is this what you need? Now you try to do the rest.

Are you sure the interest is 3.25% per month? That is 39% per year. Maybe you mean 3.25% per year?

math
You're welcome :)

math

math !!!! :O

Pre Algebra
The formula for simple interest is, I = PRT (Interest = Principle * Rate * Time) Balance of account ? t + 9 years?

Pre Algebra

I don't have an answer different from the one you were given. If I could help more I would. What answer are you looking for? The answer did answer the question. The answer gave similarities and differences.

math
Ratio = Boys : Girls = 4 : 3 4x = number of boys 3x = number of girls 4x - 6 = 3x x = 6 4x = number of boys = 4 * 6 = 24 3x = number of girls = 3 * 6 = 18 If another 2 girls join the choir, 18 + 2 = 20 = new number of girls 24 = number of boys New ratio = 24 : 20 = 6 : 5

Math
You're welcome :)

Math
Please don't type in all caps. This is the equivalent to shouting and is rude. 3 less than twice x = 2x - 3 2 more than the quantity 3 times x = 3x + 2 (2x - 3)(3x + 2) = ? Use FOIL to expand.

algebra
(3a-2b)(4a+3b) Using FOIL-first, outer, inner, last (3a - 2b)(4a + 3b) First = 3a * 4a = 12a^2 Outer = 3a * 3b = 9ab Inner = -2b * 4a = -8ab Last = -2b * 3b = -6b^2 12a^2 + 9ab - 8ab - 6b^2 Combine like terms 12a^2 + ab - 6b^2

Algebra
2x - y = 4 if x = 0 2(0) - y = 4 0 - y = 4 -y = 4 y = - 4 if y = 0 2x - 0 = 4 2x = 4 x = 2 Now, it's your turn. Solve the rest just like the examples above.

math
Check your problem. Not enough info is given here to find any angles.

math
You're welcome :)

math
angle 1 = x angle 2 = x + 7 angle 3 = x + 7 + 31 x + x + 7 + x + 7 + 31 = 180 Solve for x, measure of angle 1. Then, angle 2 = x + 7 angle 3 = x + 7 + 31

You are missing the % for interest and the amount for the annual deposit into the IRA.

math
(1 1/2 + p)*2^2 = 12 4(1.5 + p) = 12 6 + 4p = 12 4p = 6 p = 6/4 = 3/2

algebra
A = Lw 16y^7 + 32y^5 + 80y^3 Factor into 2 factors. 1st factor = w 2nd factor = L

math
1 1/2 + 8 3/4 + 5 1/8 + 1 1/4 Find the common denominator, 8. 1 4/8 + 8 6/8 + 5 1/8 + 1 2/8 Now can you add these?

You must have patience. Tutors volunteer their time to answer questions. Maybe a tutor that is familiar with you question isn't on right now. Reposting the same question over and over will not get an answer any sooner. Also, if you look at one of your prior posts someone ...

Math
See your prior post. This problem is done the same way. Substitute y = x + 2 in x^2 + y^2 = 36, and solve for x. Then find y. You are missing the exponents in x^ + y^ = 36 I assume the missing exponent is squared.

algebra
n = games played 4 = games lost n - 4 = games won Ratio, won : lost (n - 4) : 4

math
2^2 (two squared) means 2 * 2 = 4 3^2 (three squared) means 3 * 3 = 9 In 3^2 The exponent (2) means how many times you multiply the base (3) by itself. 2^3 (two cubed) means 2 * 2 * 2 = 8 3^3 (three cubed) means 3 * 3 * 3 = 27 In 3^3 The exponent (3) means how many times you ...

Math
y = x + 2 y = x^2 Substitute, y = x + 2 in y = x^2 x + 2 = x^2 x^2 - x - 2 = 0 (x - 2)(x + 1) = 0 x = 2, x = -1 Substitute, x = 2 and x = 1 in one of the equations to find y.

science
Silent killer means that there are not any overt symptoms when your blood pressure is high. Example, generally, you can't feel that your blood pressure is high (like pain) and therefore, you won't know to see a doctor for treatment. Generally, untreated HBP damages ...

Math
Depends on the shape. Volume of a rectangular box, V = Lwh units^3