Sunday
December 4, 2016

Posts by steve

Total # Posts: 46,800

math
10*6, right?
November 15, 2016

maths need help word problem
a+b=9 (10b+a)/(10a+b) = 6/5 54/45 = 6/5
November 15, 2016

Algebra
nope. 9x+3y = -22 has slope -3 better review how to find the slope.
November 15, 2016

Math
6/(6+7)
November 15, 2016

Math
come on -- just add them up
November 15, 2016

Math grade 6, Fractions
64-28=36 stickers that Dan gave Perry 36 is 4/5 of the original amount so, 9 is 1/5 Thus Perry had 45 to start with
November 15, 2016

maths
the 2nd pole is 20m away the 3rd is 40m and so on
November 15, 2016

Maths
9,999 and 10,000
November 15, 2016

wisdom'
and threw up
November 15, 2016

math
w(3w-2) = 65 what are the factors of 65?
November 15, 2016

Math
subtracting less means the result will be greater
November 15, 2016

Maths
Suppose 4 of each color were drawn. That makes 16 balls. The 17th ball would have to be the 5th of one of the colors.
November 15, 2016

math
if you say so. tan(75/2) = (1-cos75)/sin75 now, 75 = 90-(30/2) so, use the half-angle formulas on that
November 15, 2016

College Algebra
left: y = (x+4)^3 up: y = (x+4)^3 + 8 scale: y = 0.75((x+4)^3 + 8) = (3/4)(x+4)^3 + 6 = (3/4)x^3 + 9x^2 + 36x + 54
November 15, 2016

Arithmetic
.20 * 29.50
November 15, 2016

Math
man - just use the formula! Prt = 4010 * .052 * 4
November 15, 2016

geometry
see previous post for method.
November 15, 2016

geometry
well, the central angle is the same as the exterior angle... Or, you have an isosceles triangle with vertex of 60. The interior angles are made up of two of the triangles' base angles.
November 15, 2016

Chemistry
see the related questions below
November 15, 2016

Algebra
note that y changes by 2 when x changes by 1.
November 15, 2016

Math
10096
November 15, 2016

math
in 4 days, A&B&C did 4(1/24 + 1/36 + 1/48) = 13/36 of the job In the last 3 days, B working alone did 3/36 = 1/12 of the job That left A&B to do 5/9 of the work 1/24 + 1/36 = 5/72, so it took A&B 8 days to do their part.
November 15, 2016

math
none of the above, that's for sure.
November 15, 2016

Chemistry
google is your friend. And it's faster than waiting around here.
November 15, 2016

College Calculus
20 * (1/2)^(t/27)
November 14, 2016

Math : )
1/6 + 1/3 = 1/2 red or blue 3/7 * 1/2 = 3/14 green 3/14 x = 27 x = 126 21 red 42 blue 27 green
November 14, 2016

Tim
oh please - just use their definition! f2(x) - f3(x) = (1/8 (x+16)^2-98) - (2x+24) You might want to simplify that to x^2/8 +2x -90
November 14, 2016

Tim
no idea what you want to do. We could make g(x) = f2(x) - f3(x) or whatever you want to do. What do you mean when you say "this function"?
November 14, 2016

math
no files here. Surely you can compare two numbers!!???!?
November 14, 2016

Math
pieces: x x/2 x/2+4 x + x/2 + x/2+4 = 10 2x = 6 x = 3 check: 3 + 1.5 + 5.5 = 10 How did they come up with 2 3/4? I suspect a typo. f(-1/2) = 2(1/4) - 1/4 - 4 = -15/4
November 14, 2016

Geometry
Pair up the sides. You will find that the three sides of the two triangles match up, so since the two triangles have matching sides, they are congruent: SSS
November 14, 2016

Algebra
x + 2x+3 = 51
November 14, 2016

maths
40 spaces, so 41 poles. I think you can gt (c). Figure out how far the nth pole is.
November 14, 2016

maths
well t wholes is 24/24 So what do you add to 7 to get 24?
November 14, 2016

Math
and have someone seal the edges tightly with duct tape. Soon your pain will be gone.
November 14, 2016

College algebra
you have to multiply by 1/2 every 1500 years. So, the fraction remaining after t years is (1/2)^(t/1500) So, after 2800 years, the fraction remaining is (1/2)^(2800/1500) = 2^-1.8667 = 0.2742 = 27.42% Note that 2800 is almost 3000, or two half-lives. At t=3000, 1/2^2 = 1/4 = 0...
November 14, 2016

Math
Start with T1 which has sides 1 and 1. Its hypotenuse is ?2 Now draw T2, with its base as the hypotenuse of T1, and its other side is 1. T2 has sides ?2 and 1, so its hypotenuse is ?3 Keep drawing new triangles on the hypotenuse, and you will get a spiral figure. Tn has its ...
November 14, 2016

Math checking answers (Calculus Differentials)
I got the same answers. I hope we're both right!
November 14, 2016

Algebra
since the flat fee is less than the hourly fee, the more hours, the more pay.
November 14, 2016

Algebra
since the number of hours worked is the same, of course adding another $50 fee will pay more.
November 14, 2016

true
If the 4-vector is <4,0> then the 3-vector is <3/?2,3/?2> Add 'em up.
November 14, 2016

Math
surely you can find two small primes that work in each case... For example, 12 = 5+7 38 = 7+31
November 14, 2016

science
convert the mass to moles. Each mole of Zn requires 2 moles of HCl. So, determine which reagent will run out first. That will tell you how many moles of products get formed. Each mole of Zn used produces 1 mole of H2. Convert that back to grams.
November 14, 2016

Math
each side will be ?216 If you can't figure that out, just start listing the cubes of integers: 1^3 = 1 2^3 = 8 3^3 = 27 ... and see where you get 216
November 14, 2016

Trigonometry
csc x < 0 in QIII,QIV cot x > 0 in QI, QIII So, all 180 < x < 270 satisfy the requirements.
November 14, 2016

Math
what is /25? -25 + -9 = -34 25 + -9 = 16
November 14, 2016

Geometry
looks good
November 14, 2016

Graphing Linear Equations and Inequalities
well, did you fill in the table? when x=0, you have 4y = -16 and so on
November 14, 2016

Maximal area and dimensions of a window
see the related questions below. It does get a bit messy.
November 14, 2016

Calculus - Word Problems
v = 4/3 pi r^3 dv/dt = 4 pi r^2 dr/dt Now just use your numbers
November 14, 2016

Calculus - Optimization
blah blah stop reposting and wasting everyone's time
November 14, 2016

Calculus
see related questions below
November 14, 2016

Algebra 2
Take a look at the graph and figure it out. http://www.wolframalpha.com/input/?i=x%5E3%2B3x%5E2-9x-8
November 14, 2016

math
cosines will work well here, since you have B,a,c b^2 = a^2+c^2-2ac*cosB Then you can use sines to get A,C,b
November 14, 2016

math
You have a and A, so use sines: a/sinA = b/sinB That gives you B. Now A+B+C=180 Having C, use sines to get c.
November 14, 2016

math
I could not get the image to come up, but you will find that the maximum area is achieved when it is equally split among the widths and lengths. So, 1050 will be divided among the vertical pieces, and 1050 will be split into horizontal pieces. Define the 2100 as the sum of *x...
November 14, 2016

math
I will assume you gave the correct numbers. Now, present them in a way we can understand. Copy/paste from spreadsheets and word processor files does not work well here.
November 14, 2016

Math
construct a segment of length 19.5 At each end, draw a circle of the same radius. Where the circles intersect above (or below) the line will be the third vertex of the triangle, since all three sides are the same. Get out your protractor and measure the angles.
November 14, 2016

Math
a set has individual members Usually finding part of a whole involves dividing a single unit into pieces. Not really so different, but I think of it as the difference between cutting up an apple and separating the pieces of a puzzle.
November 14, 2016

math
Looks like Heron's formula is best here to get the area. Then, divide that by 70m^2/gal to get the # gallons.
November 14, 2016

math
so, a total of 16 east 8 north Now just find the length of the hypotenuse.
November 14, 2016

Math
depends on how long it is to take. 51 mph will do the job in an hour.
November 14, 2016

Math
1 - 1/5 = ? What did he spend it on -- Capital Letters?
November 14, 2016

math
and ... ?
November 14, 2016

pascal programming
the only critical thing here is deciding the age of the division.
November 14, 2016

math
x[(1.12)^(3/2) - (1.12)] = 150 assuming compounding annually
November 14, 2016

math
Draw a diagram and review your basic trig functions. It should be clear that the height is 15 sin60° + 8 sin30°
November 14, 2016

Calculus
Looks good to me, but I'd write it as -7/12 ft/s
November 13, 2016

Calculus
x^2+y^2 = 25 x dx/dt + y dy/dt = 0 So, find y when x=7, and then just use your numbers to find dy/dt
November 13, 2016

Graphing Linear Equations and Inequalities
while in this case, the explanation gives the right area, technically, the area to the right of the line is x > y/2 Since the y-coordinates are measured vertically, you should be looking for the area below the line. In this case, it's the same area.
November 13, 2016

Math
x+y+z = 7900 .05x + .11y + .15z = 965 z = x+y + 500
November 13, 2016

Math
The two roots of 2 and 5 mean y = a(x-2)(x-5)(x-h) for some h. Since y(0)=10, a(-2)(-5)(-h) = 10 ah = -1 Now, fix the bogus (-4) point and see what a and h have to be.
November 13, 2016

Science (galaxies and universe)
since it takes light some time to arrive at earth, we see what was happening when it left the galaxy, not now. So, if the star is one light-year away, when we see the light, it shows what was happening one year ago. Time travel!
November 13, 2016

Math
y-k = f(x-h) translates the graph y=x by the amounts h right and k up. y = (x+2)^2-3 y+3 = (x+2)^2 y-(-3) = (x-(-2))^2 so, that is the graph y=x^2 shifted -3 up and -2 right. Or, more simply, 2 left and 3 down. Work the others the same way. You can verify your results at the ...
November 13, 2016

Stoichiometry
First, balance the equation: 2Al + 3Cl2 -> 2AlCl3 So, you need 3/2 as many moles of Cl2 as you do Al.
November 13, 2016

Math
42
November 13, 2016

Integral Calculus
The p+2 just confuses things. Let q = p+2. Then you have the series 1/1 - 1/2^q + 1/3^q - 1/4^q The alternating series test says this converges for q>0 That is p > -2
November 13, 2016

Math
which multiple of 3 is 10 more than the same multiple of 2? 3x = 2x+10 x = 10 So, 10 students, 30 pencils.
November 13, 2016

Math
101 102 ... 198 199 and so on up to 904
November 13, 2016

English
#10 should be: Whoa! Bogus, D00d!
November 13, 2016

PreAp Math - incomplete
a. no way to tell, without knowing how many members in the club, or how many times they went shopping in a year. All we know is that some people spent about $18*1.055 each. Big deal.
November 13, 2016

Science-please help
2 and 3 are both involved. If the moon stood still (like the sun) #2 would do it If the earth did not rotate, #3 would still cause the moon to appear to rise and set, but it would only do it once a month, instead of once a day. I think #2 is the best answer here.
November 13, 2016

Math
think about C. It differs from B only in the rate of growth. (100% vs 3%)
November 13, 2016

help me calculus
I'll just use t for ease of typing. Those big Øs just distract me from the math. And that's "pi" not "pai" or "pie" or a dozen other ways it gets misspelled! x = cos(2t) y = 1+sin(2t) dy/dt = 2cos(2t dx/dt = -2sin(2t) dy/dx = dy/dt...
November 13, 2016

NO
?7 is real, but not an integer.
November 13, 2016

Math
assuming you meant the line joining those two points, it is (y2-y1)/(x2-x1) = (6-(-5))/(-4-3) = 11/-7 or, more usually, -11/7
November 13, 2016

8th Grade Pre-Algebra
P' = 1/3 P reflection in the y-axis just changes the sign of all the x-values. Since P" ? P', and P' is smaller than P, P" cannot be ? to P It is, however, similar to P.
November 13, 2016

MATH
clearly not A. 1.5 is real, but not an integer.
November 13, 2016

another please help me check~calculus maths
see related questions below.
November 13, 2016

College algebra
if x at 10%, then the rest (2500-x) at 8%. So, add up the interest: .10x + .08(2500-x) = 2200 But before trying to solve that, think on the numbers. No way could $2500 produce $2200 in interest...
November 13, 2016

Calculus
I guess you did. y' = (8e^(8x))(e^(8x)+9)-(e^(8x))(8e^(8x)) -------------------------------         (e^(8x)+9)^2 = 72e^(8x)/(e^(8x)+9)^2 You can use wolframalpha.com to confirm your results: http://www.wolframalpha.com/input/?i=...
November 13, 2016

Calculus
f = x^3+8x-3 f' = 3x^2+8 f'(6) = 116 dx/df = 1/(df/dx) = 1/116 1/11 must be a typo. http://www.sosmath.com/calculus/diff/der08/der08.html
November 13, 2016

Algebra 2
the real solutions are where the graph crosses the x-axis. That is, where ax^2+bx+c = 0
November 13, 2016

need help calculus plz plz-sir steve
ln(ab+cd) is NOT lna +lnb + lnc +lnd
November 13, 2016

need help calculus plz plz-sir steve
y=3e^(2x)cos(2x-3) y' = 6e^(2x) (cos(2x-3)-sin(2x-3)) y" = -24e^(2x)sin(2x-3) y" - 4y' + 8y = -24e^(2x)sin(2x-3) - 24e^(2x)(cos(2x-3)-sin(2x-3)) + 24e^(2x)cos(2x-3) = 0 Note that the DE y" - 4y' + 8y = 0 has the solution y = e^(2x)(a cos2x + b sin2x...
November 13, 2016

Math
Clearly, k=0 will do the job, but I doubt that's what you want. the quadratic formula says x = (-8±?(64-144k))/72 So, any negative value of k which makes 64-144k a perfect square will work. SO, if we let v be 64-144k, we have k v -1 208 -2 352 -3 496 -4 640 -5 784...
November 13, 2016

Math
That's better. Recall that area = base*height/2 BC is the base, and AD is the height.
November 13, 2016

Math
you have serious notation problems.
November 13, 2016

trigonometry
convert to x-y, add the components, and convert back to compass bearing. 15 @ S40°10’W = <-9.675,-11.463> ...
November 13, 2016

algebraic expression
15-12 and 15+12
November 13, 2016

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>