# Posts by steve

Total # Posts: 51,715

Math
There are 4 rectangular faces, each 7x13

math
geez - impatient much?

Science
mine, too

Science
well 1 million would provide 1000000/24000 = 41.7 mg

Science
so, how many nematocysts are there? divide by 24000 to see how many grams

Science
B & D look good to me

math
Can't say I care much for your text formatting. Since you seem to be dealing with fractions, I assume you meant to say R = 3/x + 9/y So, just plug in your numbers and solve for x: 7 = 3/x + 9/6 If I got the function wrong, just fix it and plug in the numbers to get ready ...

math
just subtract the picture from the total area: (40+15)(50+15) - 40*50

Calculus
well since the fraction approaches 1/0, clearly it will approach either +? or -? So, just check the denominator to see whether it is positive or negative. a) x->2+ means x > 2. So, x^2 > 4 and the limit is +? similarly for the others.

Math
m = 3d m-5 + d-5 = 50

Math
a - x/2 = 12 a + x/2 = 2x x = 2x-12 x = 12 finish it off

Math
j+k+b = 390 j = 5b k = 3/4 j now just solve for k.

Math (Integrals) (Volume of Revolution Setup)
looks good to me

Math Tangent Graph
the graph of tan(x) goes through (0,0) and has asymptotes at -?/2 and ?/2, for a period of ?. This graph also goes through (0,0) but its asymptote is at -?/6, for a period of ?/3. So, it is the graph of tan(3x) Or, note that instead of a single period in [-?,0] it has 3 periods.

Algebra
You have some funky formatting there. I read it as f(x) = 8*3^(x-2)+2 but it doesn't really matter what f(x) is. Stretching by a factor 3 just means that g(x) = 3*f(x)

physics
scroll down a bit here, and you can figure it out. https://en.wikipedia.org/wiki/Trajectory

Math
surely you can see that 0 represents the year Gabe was born. since Gabe was 14 in 2002, you can easily figure out the year that he was born.

Math
correct

Math
geez - just get out a pencil and draw the number line. Start at 0. Move right 10 and then left 11 where are you?

maths
well, there are 7 1/2 circles. They represent 15 goals, so 15/(7 1/2) = ?

Algebra (Ms.Sue!!)
if you add 5 to each value, you add 5 to the mean and median. The range is unaffected. if you multiply by 6, the mean and median get multiplied by 6, and so does the range. Review these topics in your text or online. The definition of these items will show how they are ...

Math
well, .22x = 209

Math
quite a difference in your posts. 2x * 9x^(y^9)) = 18x^(y^9+1) Now, taking the derivative of u^v is a combination of d/dx a^v = lna a^v dv/dx d/dx u^n = n u^(n-1) du/dx d/dx u^v = v u^(v-1) u' + lnu u^v v' Since we have u=x, and v=y^9+1, taking d/dx, we get (y^9+1) x^(...

Calculus
why all those messy words? You appear to be saying f(x) = 3 for -3 <= x < 0 -x+3 for 0 <= x <= 6 -3 for 6 < x <= 9 g is increasing where f is positive: [-2,0)U(3,6] g(x) = ?[-2,0] 3 dt + ?[0,x] -t+3 dt = 6 + (-x^2/2 + 3x)+3 for 0<=t<=6

Physics
F = ma now just plug in your numbers.

calculus
s = ?[0,?] ?((2t)^2+(t cost)^2+(t sint)^2) dt = ?[0,?] ?(4t^2+t^2) dt = ?5/2 ?^2

Math Probability
I agree

geometry hhhheeeelllllpppppp
there are two triangular bases of area (1/2)*3*2.6 there are three rectangular faces. One has area 12*3 the other two have length 12, but we do not know the other two sides of the triangle...

calculus
well, you have tanz = r^2 tan2? z = arctan(r^2 tan2?) ?z/?r = (2r tan2?)/((r^2 tan2?)^2+1) ?z/?? = (2r^2 sec^2(2?))/((r^2 tan2?)^2+1) the second partials get a bit messy, but you can get them here: http://www.wolframalpha.com/input/?i=d%5E2%2Fdr%5E2+arctan(r%5E2+tan2%CE%B8) ...

calculus
just crank it out ?u/?x = 2x/(x^2+y^2) ?u/?y = 2y/(x^2+y^2 ?v/?x = -2y/(x^2+y^2) ?v/?y = 2x/(x^2+y^2

MATH
the link is missing a domain name, such as http://pictures.com/...

math
16 2/3% = 1/6 1/6 * 9 = ...

math
12* 5/3 = 5 * 12/3 = ...

maths

maths

maths
this is the same as cos30/sin30 + sin30*cot30 = cot30(1+sin30) = ?3 (1+1/2) = 3?3/2

maths
These are standard angles, whose functions you would do well to learn Cos45+sin60-tan30 = 1/?2 + ?3/2 - 1/?3 = (3?2 + ?3)/6

maths
well, (1+cot²x) = csc²x

Geometry
there are many possible line segments drawn from a to bc

Maths
301 They all leave remainder

Algebra
what's the trouble? They say S = ?(30fL) just plug in your numbers and solve for L

Algebra
If the painting has length x and height y, and the frame has width w, then we have x+2w = 10 y+2w = 8 x^2+y^2 = 100 Now just solve for w

Math
I get 104. What do you get?

Math
try using <= for "less than or equal" "under 12" means "less than 12" so, what do you think?

Math
n > 130-87

Math Check! #3
yeah, but how does that relate to choosing 4 players from a group of 8?

Math Check! #3
Hmmm. How did you get 336? This is just a "choose 4 of 8" combination. 336 = P(8,3) How does that relate to this problem. I suspect you just guessed.

maths
not sure what -< and +< mean

Math
2/(3/4) = x/30

Algebra2
Thank you

Algebra2
The water level varies from 12 inches at low tide to 52 inches at high tide. Low tide occurs at 9:15 am. High tide occurs at 3:30 pm. What is a cosine function that models the variation in inches above and below the water level as a function of time and hours since 9:15 am? ...

Geometry
correct

Algebra2
The function f(theta) and g (theta) are sine functions where f(0)=g(0)=0. The amplitude of f (theta) is twice the amplitude of g(theta). The period of f(theta) is one-half the period of g(theta). If g (theta) has a period of 2pi and fpi/4=4. Write the function rule for g(theta...

MATH
since you give no indications of any side lengths, it's kinda hard for us to say, right? and besides, area is in cm^2, dontcha know

Algebra2
thank you

Algebra2
for which value of theta is tan theta equal to sin theta? My answer is pi

math
42.75*1.18

Math
if you mean the angle is 20°, then the radius r of the circle can be found using' 5/r = sin10° Now you know r, so you can find the area of the circle...

chemistry
how many moles in 5.3g? Molarity is moles/liter

Math
since xy=48 for each pair, B is correct.

Algebra2
Thank you

Algebra2
cos?+1 = 0 cot(?/2) = 0

Algebra2
Write three trigonometric equations each with the complete solution pi+2pin

Physics-Circuits

Math
180 degrees surely your geometry text proved that most basic fact of triangles!

Math
depends on your clock. Some keep 24-hour time. and who says "army" time isn't real? It's just not "civilian" time feet are just as real as meters -- it just depends on your yardstick ...

HELP
probably for the same reason you wasted our time posting the same stupid question again ...

science
ummm ... because they grow on cherry trees? Or maybe because cherries happen where those blossoms are. Or maybe because they've never been pollinated ...

physics
a) how long does it take to fall 132m? If it takes t seconds, b) the kit lands 68.9t meters away from where it was dropped. No idea how far away from the survivor that happened.

Chemistry
hint: nuclear reaction.

Math Percents
P is 150% more than S.

math
If h is the height of the building above S, then we have h cot30° = (h-10)cot60°

Ratios
If the lightest is x, then the heaviest is 3x. So, 3x = x+8 x = 4 So, the parts are 4,8,12 oz

math
x^2+6 is the result, if you started with x.

Math
it's still a direct relationship. It just happens that the constant of proportionality is negative. The "amount you lose" increases with the running time.

math
I'll get you started... (2n^2-7n+2)*(3n+1) = (2n^2-7n+2)*3n + (2n^2-7n+2)*1 Now just expand each factor term by term, simplifying at the end.

Math
1:25 = 20:500

Science
avg speed = total_distance/total_time so, just plug in your numbers

math
don' see no steenkeng tables, but something like -1 -4 0 -3 1 -2 2 -1 3 0 ...

math
c(1+r)(1-0.15) = c what r should be depends on how much profit he expects to make. a 17.6% markup will just break even. a 20% markup will provide a 2% profit.

Science
since s = vt = 1/2 at^2, you need 6t = 1/2 * 4 t^2 3t = t^2 t = 3

science
?(100^2+70^2)

math
Your typing skills can use some improvement as well. I'd say your past laziness is now catching up to you. Too bad. Seek some in-person help. Trying to do it piecemeal here will not cut it.

Statistic
so, assume 100 candies, with 15 yellow. Your probability will be approximately 15/100 * 85/99 * 84/98 = 0.11 = 11%

Math
c'mon, guy, just write the words as algebra. If the pool has width w, then its length is w+6. Now work with the total area: (w+8)(w+6+8) = w(w+6) + 576 Now solve for w and then w+6.

Math
If the ladder has length z, then (.3z)^2+20^2 = z^2 z ? 21 ft

Math
just plug in your numbers and solve for h 900 = ?(h^2+8000h) h^2+8000h-900^2 = 0 h = 100

Math
If the base is b, then (1/2)bh = 30 (1/2)b(2b-2) = 30 ...

Geometry
Draw a side view of the figure. Using similar triangles, it is clear that (9-h)/r = 9/6 h = 9 - 3r/2 Now we can compare volumes, and we find 1/3 pi * 6^2 * 9 = 9 pi r^2 h 108 = 9r^2(9 - 3r/2) r^3 - 6r^2 + 8 = 0 r = 1.3054

Science
google the topic, and you will get lots of information.

Science
correct

Geometry
two ends with total area 2pi r^2 curved side with area 2pi r h area = 2pi*r(r+h) = 748pi

math
#3 ok #4 - better check again how many marbles out of 30 are green or purple.

recall the formula for the area of a trapezoid: A = (B+b)h/2 Its area is the average of the areas of the rectangles formed using the lengths of its bases: the left and right function values!

scienice
amplitude and wavelength

Pre cal
see your previous post. The horizontal speed is constant.

Geometry
the ratio of the volumes is the similarity ratio cubed. so, you want ?(135:625) = ?(5*27:5*125) = 3:5

Pre cal
then use that t and multiply by the constant horizontal speed of 110 cos45°

Pre cal
just solve for t in h(t) = 2 + (110 sin45°)t - 16t^2 = 0

math
a+b+c = 770 a = 2/9 (b+c) ==> b+c = 9a/2 a + 9a/2 = 770 ...

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