Posts by MILY

Total # Posts: 27

math
The rectangular coordinates of the point P are (-1,sqrt 3). If P is reflected witg respect to the x-axis, then the polar coordinates of its image are¡­??

Maths
Oh I see! I got the formula correct but I multiply it wrongly¡­Thanks a lot!

Maths
There are 12 balls in a bag, where n of them are white balls. If 2 balls are chosen at random from the bag without replacement, the probability of choosing at least 1 white balls is 19/33. Find n.

Physics
A 1-m-tall barrel is closed on top except for a thin pipe extending 4.8m up from the top. When the barrel is filled with water up to the base of the pipe (1 m deep) the water pressure on the bottom of the barrel is 10 kPa. What is the pressure on the bottom when water is added...

geometry
Triangle ABC is similar to triangle DEF. The sides of ABC are 5,8 and 11. What is the length of the shorttest side of DEF if its perimeter is 60?

COLLEGE CALCULUS. HELP!
yea it is ∫ (t^3 + 2t^2 + 2) dt from 0 to x. thanks for ur help

COLLEGE CALCULUS. HELP!
the fundamental theorem of calculus, f(x)=∫(0,x) t^3+2t^2+ 2 dt, and find f"(x). my answer was: f'(x)=x^3+x^2 f"(x)=3x^2+2x it said its wrong. i don't know how solve with interval, ∫(0,x)

Calculus. I need help!
Evaluate the indefinite integral (a.)∫√(cotx)csc^2xdx (b.)∫sec^3xtanxdx

COLLEGE CALCULUS. HELP!
anti-derivation given f"(x)=3x+0 and f'(-1)=1 and f(-1)=5 find f'(x)=? and find f(2)

Calculus AP need help!
antiderivative. find f. f'(x)= 3x^(-2), f(1)=f(-1)=0

Calculus AP need help!
antiderivative. find f. f'(x)= 3x^(-2), f(1)=f(-1)=0

Calculus. I need help!

Calculus. I need help!
HARDER PARTS WAS 3(x^2+y^2)^2=26(y^2+y^2) Find the equation of the tangent line to the curve (a lemniscate) 3(x^2+y^2)^2=26(y^2+y^2) at the point (-4,2). The equation of this tangent line can be written in the form y=mx+b where m is:? and where b is:?

COLLEGE CALCULUS.
ok i got result for m. but i don't know where is b.. i forget how do y=mx+b

Physics
Ignoring air resistance, a ball dropped from rest at altitude 250km strikes the ground with (a) 1500m/s (b) 2200m/s (c) 2800m/s I already know that is 2200m/s but don't understand why???

Physics
A 65kg person's density is 990kg/m^3 with 2.4 L of air in lungs. What vol of air would the person have to expel to bring the density to that of water 1000 kg/m^3 (neglect the mass of air)?

math
suppose ua penguin eats about 5 pounds of akrill aday.about what number of krill does the penguin eat in 100 days (hint :1pound =16 ounces)?

Physics
Never mind i just used one rev=365 days and so on to get seconds...

Physics
For a 1.1 km radious cylinder, find the time for one revolution if "gravity" at the surface is to be 9/8m/s^2. I changed 1.1km= 1100m Then I used the equation a=v^2/r to calculate the velocity. the square root of: 1100 x 9.8= 103m/s I guess my confusion is how to ...

Physics
for time in air i got approx. .40s

Physics
So why did you used the equation Vx=Vox-gt for time, instead of the equation X= -1/2gt^2 + Voxt + Xo. I used the second one because of they gave me 18.4 which is the distance traveled in the x-axes? thanks!

Physics
The fastest major league pitcher throws a ball at 45m/s. If he throws the ball horizontally, how far does it drops vertically on the 18.4m trip to the home plate?

Math
16 ft what?? what do you mean by squad?

Chem
A hydrocarbon with a molecular mass greater that 100g/mol? C8H18 = 114 g/mol

Chem
Something with L-carvone or D-carbon?

Chemistry
What is an example of a acid? Any Acid possible would be sufficient I'm sure.. how about HF thanks

Chemistry
What is a proton donor? Acids are proton donors, BAses are proton receivers