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December 4, 2016

# Posts by Helper

Total # Posts: 1,805

Geometry/Trig.
angle A = 45 deg Special 45-45-90 deg triangles have sides in the ratio of 1:1:(sqrt(2)) OR ratio n : n : n(sqrt(2)) This means, in this problem, side a = 1 (opposite side) side b = 1 (adjacent side) side c = 1*(sqrt(2)) (hypotenuse) tan A = a/b = op/adj tan 45 = ?
January 30, 2011

Calculus
Verify this equation, y = 4^x-1 You need parentheses. Is it, y = 4^(x - 1)? Or, y = 4^(x) - 1? Or ? Are you Jamal? Please don't change screen names. And, which is it? In this problem, rotation is about the x-axis. In the 'Jamal' problem, rotation is about the y-axis.
January 30, 2011

calculus
Check your problem. Does the problem state between x = a and x = b?
January 30, 2011

Intermediate Accounting
For compounded annually R = rate, n = number of years FV = orig investment * ((1 + R)^n) 1,000,000 = 182,696 * (1 + R)^15 5 = (1 + R)^15 (15th root(5)) = 1 + R 1.11 = 1 + R .11 = R please check my math
January 30, 2011

math
D = RT Distance = Rate x Time T = D/R R = D/T
January 30, 2011

trig
x = 225 degrees
January 30, 2011

trig
Do you mean -(sqrt(2))/2 ?
January 30, 2011

Geography 7
The usual term for the place where two (or more) rivers meet is "confluence". From wiki answers dot com
January 30, 2011

derivative of f(x)=7x-19 at x=2 f'(x) = 7 f'(2) = 7
January 30, 2011

science
"The moon is much smaller than the earth. As a result, the force of gravity on the moon is only about one sixth as strong as gravity on earth. Gravity is what holds us down on the earth's (or moon's) surface. If you were to weigh yourself on a scale here on earth ...
January 29, 2011

Chemistry
January 29, 2011

Physics
January 29, 2011

geometry
s = side of square P = 4s 30 <= 4s <= 64 30/4 <= s <= 16 15/2 <= s < 16
January 29, 2011

mat/116
Try to solve these inequalities first. Compound inequalities with 'Or', are solved separately and the solutions have 'or' between them. Example. If the solution to the first was x < 2 and the solution for the second was x > 4, then the solution would be, ...
January 29, 2011

Math
Thanks so much MathMate!!
January 29, 2011

Math
If possible, could a math tutor check the math post question that "daylo3" asked at 6:42 pm today, that I answered? I don't usually answer posts that I am not 100% sure of the answer. I would like to know if the way I approached this problem is correct? Thanks in...
January 29, 2011

Algebra
194 * 10^3 = 194,000 Scientific notation 1.94 x 10^5
January 29, 2011

Math
Since, the problem states to use R and C for the equation, change the x to C. So, the equation would be, R = 1.4C - 7 Instead of, R = 1.4x - 7
January 29, 2011

Math
A.) Cost 85, Retail 112 Cost 175, Retail 238 For the equation (x,R), x = cost (85,112), (175,238) Since linear, use y = mx + b R = mx + b slope m = 238 - 112/(175 - 85) slope m = 126/90 = 1.4 R = 1.4x + b To find b, plug in (85,112) 112 = 1.4(85) + b 112 = 119 + b b = -7 R = 1...
January 29, 2011

trig
Leave in radical form means don't simplify the sqrt (radical) to exact value. Example, exact value of (sqrt(2))= 1.4142 All your answers are correct. Always simplify radicals, ie,(like you did), but wasn't sure, (sqrt(52)) = 2(sqrt(13)) don't leave as (sqrt(52)) (...
January 29, 2011

MATH: Pre-Cal/Trig
A = wL x = width of garden x + 6 = length of garden Area of garden = x(x + 6) x + 6 = width of garden and walkway x + 6 + 6 = x + 12 = length of garden and walkway Area of garden and walkway = (x + 6)(x + 12) Area of garden and walkway - 288 = area of garden (x + 6)(x + 12) - ...
January 29, 2011

algebra
Commutative Property (think commute or move around)is the one that refers to moving stuff around. For addition, the rule is a + b = b + a From purplemath dot com
January 29, 2011

Math
Assuming you mean 4 - 7^(2x) = 1 7^(2x) = 3 Take logarithm to base 7 of both sides 2x log 7 = log 3 x = log 3/(2 log 7) x = 0.4771/(2 * 0.8451) x = 0.4771/1.6902 x = 0.2823
January 29, 2011

Personal Finance
b. Future value of an asset with interest compounded annually, (you didn't mention how to compound) n = number of years R = rate FV = Original investment * ((1 + R)^n) Cal. Future value of salary, 6%/year 1st year--23,000 2nd year---23,000 + 1,380 = 24,380 3rd year---24,...
January 29, 2011

chemistry
January 28, 2011

math
Assuming you earn a total of \$70. x = amt earned Sat 2x = amt earned Sun 1/2 x = amt earned Fri x + 2x + 1/2 x = 70 Solve for x
January 28, 2011

Income Tax
My answer above is assuming you meant the United States. I don't know, if your question is for a different country.
January 28, 2011

Income Tax
I would say true.
January 28, 2011

Algebra
MP = (1,3), A = (8,2), B = (x2,y2) Midpoint x = 1/2(x1 + x2) Midpoint y = 1/2(y1 + y2) 1 = 1/2(8 + x2) 2 = 8 + x2 x2 = -6 3 = 1/2(-2 + y2) 6 = -2 + y2 y2 = 8 B = (x2,y2) = (-6,8)
January 28, 2011

geometry
By "around" do you mean perimeter? A six figured polygon with equal sides, is called a regular hexagon.
January 28, 2011

economics
then? Is this problem complete?
January 28, 2011

math
Not subtraction. Division would be used to solve this problem.
January 28, 2011

math
Convert all the fractions to fractions with the same denominator, using the LCD. A. 18/30 B. 20/30 C. 15/30 D. 21/30 Now, wouldn't the largest fraction be closest in value to 1?
January 28, 2011

math
Is this the exact wording of the problem? Assuming "then subtract from result" is referring to the unknown number n, 7(n/3) - n = 36 7n - 3n = 108 4n = 108 n = 27
January 28, 2011

I = PRT (Interest = Principal * Rate * Time) .04 interest/yr = .003 mo (.04/12) I = 6000 * 0.003 * 7 You can take it from here.
January 28, 2011

Integrated Physics and Chemistry
January 28, 2011

geometry
January 28, 2011

Mathl
Please put the school subject name in the "School Subject" box. Thank you.
January 28, 2011

geometry
Thanks drwls. I could not understand this post at all. :)
January 28, 2011

geometry
January 28, 2011

bedmass
There is no need to multiply the left side of the equation by 2.
January 28, 2011

Math
If you would like a math tutor to help with your problem in a timely manner, please follow directions and put the school subject in the "School Subject" box.
January 28, 2011

geometry
I do not understand your post. Exterior angle? Where? Which one? "find the other interior opposite angle" Other? Interior? Opposite what? "and the third angle of each triangle" How many angles do you expect someone to find? Please re-read your post. Think ...
January 28, 2011

Algebra B
You need to use parentheses. x-4/x+3 = x-1/x+2 Is the problem, x - 4/(x+3) = (x-1)/x + 2 x - 4/x + 3 = x - 1/(x+2) Or x - 4/x + 3 = x - 1/x + 2 Can you see the difference in these equations? This is probably why no one answered your question.
January 27, 2011

math 9 helppp
Well, you arrived at the same answer, but the equation is not correct for the problem. Your equation doesn't make sense. Where did you get 380? 380/7 = 54.29 not 55, even rounded it would be 54 or 54.30 not 55. And, it is 3.50 fee/ticket. You can't randomly subtract 3....
January 27, 2011

math 9 helppp
The equation is 7x = 385 - 7(3.50) 7x = 385 - 24.50 7x = 360.50 x = 51.5 EACH ticket has a 3.50 service fee
January 27, 2011

Calc.
| x^3*sqrt(x^2 + 1) dx | = integral sign | x^2 (sqrt(x^2 + 1)) x dx u = x^2 du = 2x dx 1/2 du = x dx 1/2 | u (sqrt(u + 1)) du w = u + 1 dw = du u = w - 1 1/2 | (w - 1) (sqrt(w)) dw 1/2 | (w - 1) w^1/2 dw 1/2 | w^3/2 dw - 1/2 | w^1/2 dw 1/2 (2/5 w^5/2) - 1/2 ( 2/3 w^3/2) + C 2/...
January 27, 2011

algebra
Not correct 121t^4 + 44t + 4
January 27, 2011

Math
I pasted below an example that reiny (tutor here) did recently. 10 and 55 are done in this example. Follow what reiny did for 45. EXAMPLE 10 = 2*5 75 = 3*5*5 55 = 5*11 The GCF is the largest number that divides into all three numbers, in this case 5 the GCF ≤ the ...
January 27, 2011

math
(6x^2-3x-9)-(2x^2+8x+3) Remove parentheses and change the sign of the terms inside the parenthese Combine like terms 6x^2 - 3x - 9 - 2x^2 -8x - 3 I leave the rest to you
January 27, 2011

algebra
Add the two 3x^2 + 7x - 3 + 5x + 2 = ?
January 27, 2011

Geometry
Correct
January 27, 2011

algebra
2z^2 IS 2z^2 or 2*z*z
January 27, 2011

Math
The time x cannot be negative. You must have made a mistake. The two equations are, distance gone by car = 64x distance gone by truck = 56(x+1/4) Since the distances are equal, 64x = 56(x + 1/4) 64x = 56x + 56/4 64x = 56x + 14 8x = 14 x = 1.75 From above (Reiny's ...
January 27, 2011

math
If P1(x1,y1) and P2 (x2,y2) are two points on a line, the number m defined by the equation Slope m = (y2 - y1)/(x2 - x1) is called the slope of the line.
January 27, 2011

math
3.4 + (5x - 1.7) plug 2.2 in for x 3.4 + 5(2.2) - 1.7 3.4 + 11.0 - 1.7 You can take it from here
January 27, 2011

MATH
Slope-intercept form y = mx + b m = slope b = y-intercept 5X - 2Y = -10 2y = 5x + 10 y = 5/2 x + 5 Slope m = 5/3 y-intercept b = 5
January 27, 2011

Pre-Algebra Math
\$1167 ttl value of bills \$147 ttl value of other bills \$1020 value of tens and twenties n = number of tens and twenties 10n = ttl value of tens 20n = ttl value of twenties 10n + 20n = 1020 Solve for n, number of tens and twenties (equal number of both)
January 27, 2011

Algebra
2x + 5y = 4 Add -2x to both sides 5y = -2x + 4 divide both sides by 5 y = -2/5 y + 4/5 So, slope m = -2/5 Perpendicular lines, the slopes are negative reciprocals of each other. Slope = -2/5 m1 * m2 = -1 -2/5 * m2 = -1 m2 = -1/(-2/5) m2 = 5/2 Now you have to find b, for the ...
January 27, 2011

Math
I'm not sure what your question is ? 1 mile = 5280 feet 2 miles = 2 * 5280 ft = ? feet You can do the multiplication
January 27, 2011

math
Perimeter ABCD = 54 L = 12 in Perimeter LMNO = x L = 2.4 ft = 28.8 in P = 2w + 2L Use Ratio to find x (perimeter LMNO) 12/28.8 = 54/x Cross multiply 12x = 1555.2 x = 129.6 LMNO P = 129.6 L = 28.8 P = 2w + 2L 129.6 = 2w + 2(28.8) Solve for w, width of LMNO
January 27, 2011

Calc.
After all that, I confused myself and did the wrong problem I think. IF your problem is |x cos(x^2) dx just like your 2nd reply says, ignore the above. I wrote down | x cos (x^2) but integrated | x cos^2 x dx So, your very first post IS correct if it is cos x^2 and not cos^2 x...
January 27, 2011

Calc.
| x cos(x^2) dx The first line should be | x cos^2 x I forgot to change it.
January 27, 2011

Calc.
| x cos(x^2) dx | = integral symbol By half-angle cos^2 x = 1/2 (1 + cos 2x) | x 1/2 (1 + cos 2x) dx 1/2 | x + x cos 2x dx 1/2 | x dx + 1/2 | x cos 2x dx 1/4 x^2 + 1/2 | x cos 2x dx Integrate | x cos 2x dx by Integration by Parts u = x, dv = cos 2x dx du = dx, v = 1/2 sin 2x 1...
January 27, 2011

Calc.
S b= sqrt(Pi) a= 0 xcos(x^2)dx What is "S b = sqrt(Pi) a= 0" What are you integrating? Is it this? x cos(x^2) dx ? from a = 0 to b = (sqrt(pi))?
January 27, 2011

Bobpursely
Thank you, drwls!
January 27, 2011

Bobpursely
FYI-Many questions are under the name "Anonymous". If you expect a particular tutor to help you, you need to be more specific.
January 27, 2011

Help
January 27, 2011

Help
Yes, x = 3 See your 1st post. I had a typo, and corrected it below.
January 27, 2011

Help
This problem was solved below for you. How many tutors do you need to solve this for you?
January 27, 2011

college algebra
1500sqrt(2)+1450 unless you use the value of (sqrt(2)), these two expressions cannot be added.
January 27, 2011

Math
Ignore above. I thought it was 3x = 1, not 3x - 8 = 1 x = 3
January 27, 2011

Math
Correct!
January 27, 2011

Math
(cubed root 3x-8)-1=0 Take the cube rt of both sides 3x - 1 = 0 3x = ? I'll leave this for you to finish
January 27, 2011

Math correct or not
Not correct
January 27, 2011

Math
Are you asking for the area of this box? A = Lw A = 2 2/3 * 2 2/3 A = 8/3 * 8/3 A = 64/9 = 7 1/9 sq ft
January 27, 2011

algebra
s = 4x - 3 V = s^3 V = (4x - 3)^3 V = (4x - 3)^2 (4x - 3) I leave the multiplication to you.
January 27, 2011

finance
January 27, 2011

It could be, 9 + 40 = 49 a^2 + b^2 = 41^2 a + b = 49 Solving simultaneously a = 9, b = 40 or a = 40, b = 9 41^2 = 9^2 + 40^2 1681 = 81 + 1600 1681 = 1681
January 27, 2011

Do you mean that the two unknown sides total 49, or all three sides total 49?
January 27, 2011

Gym
Going up, down, diagonal what? Adding, multiplying, etc to equal 24? What exactly does the problem state to do?
January 27, 2011

trig
Correct!
January 27, 2011

Precalc
No solutions exist
January 27, 2011

Algebra 1
2x + 5y = 4 Add -2x to both sides 5y = -2x + 4 divide both sides by 5 y = -2/5 y + 4/5 So, slope m = -2/5 Perpendicular lines, the slopes are negative reciprocals of each other. Slope = -2/5 m1 * m2 = -1 -2/5 * m2 = -1 m2 = -1/(-2/5) m2 = 5/2 Now you have to find b, for the ...
January 27, 2011

algebra
R = 221.19x - 0.2x^2 R = 221.19 (273) - 0.2(273)^2 R = 221.19 (273) - 0.2(74,529) R = ?
January 27, 2011

Math
To understand this you really need to sketch this out. Think of the x/y axis on a graph, with the y-axis as North and the x-axis as East. Both boats are traveling from the North (top of the y-axis), toward East (down toward the x-axis). The first bearing, forms a 47 deg. angle...
January 27, 2011

Exponents
Meant to comment, If you square x^-2, x^-2 * x^-2 = x-4 = 1/x^4 1/^4 = 81 square root of both sides 1/x^2 = 9 You are back to the above.
January 27, 2011

Exponents
x^(-2) = 9 Since, x^(-2) = 1/x^2 1/x^2 = 9 Multiply both sides by x^2 1 = 9x^2 1/9 = x^2 square root of both sides + - 1/3 = x
January 27, 2011

Math EASY
Like Ms. Sue said. I just did this based on info you provided.
January 27, 2011

Math EASY
(83 + 3/5 + 5/5)/3 (83 + 60 + 100) = 243/3 = 81 81%
January 27, 2011

If you would like help in a timely manner please follow directions and put your school subject in the "School Subject" box.
January 27, 2011

MATH
If I am picturing this correctly, a right triangle is formed, with the hypotenuse c = 75 cm. Since the top of the wall is 5.4 m above ground, 5.4 - side a = height above ground to the roof edge. Angle A = 180 - (23 + 90) = 82 degrees sin 82 = op/hyp = a/c = a/75 0.9903 = a/75 ...
January 27, 2011

arithmetic
5/6 * 4 Since 4 = 4/1, you multiply the numerator of 5/6 times 4, and the denominator of 5/6 * 1 5/6 * 4/1 = 20/6 = 10/3
January 27, 2011

5th math
x = number of boys x + 4 = number of girls x + x + 4 = 30 2x + 4 = 30 2x = 26 x = 13 x = number of boys = 13 x + 4 = number of girls = 13 + 4 = 17 13 boys + 17 girls = 30
January 27, 2011

Pat, I read that wrong. 77/35 * 285 = ?
January 26, 2011

All that info and all the problem wants is the cost for 285? .77 each x 285 = ?
January 26, 2011

5th math
w = width, L = length Perimeter = 2w + 2L 60 = 2w + 2L 60 = 2(w + L) Divide both sides by 2 30 = w + L Since a square has equal sides and w + L = 30 15 + 15 = 30 So each side is 15 15 + 15 + 15 + 15 = 60 I don't know if a 5th grader does this type of problem like I did. If...
January 26, 2011

Algebra 1
2x + 5y = 4 Add -2x to both sides 5y = -2x + 4 divide both sides by 5 y = -2/5 y + 4/5 So, slope m = -2/5 Perpendicular lines, the slopes are negative reciprocals of each other. Slope = -2/5 m1 * m2 = -1 -2/5 * m2 = -1 m2 = -1/(-2/5) m2 = 5/2 Now you have to find b, for the ...
January 26, 2011

Algebra 1
Did you see the answer to your post below? Post your work so I can see where you are having trouble.
January 26, 2011

5th math
Mean is the average ADD the number of letters and divide by the number of numbers. 105 + 97 + 88 + 86 = sum Average = sum/4
January 26, 2011

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