# 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!**

oops my bad.. 26(x^2-y^2)

**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