# Posts by Po

Total # Posts: 38

**Algebra**

Given below are equations for 2 planes in R3. 3x1 ? 2x2 = 10 x1 + 2x2 + 4x3 = ?2 Explain why these two planes must intersect in a line.

**Algebra **

Given points A(1, 3, ?2), P1(2, 0, ?1) and P2(4, ?2, ?1) Find the point P on the line through P1 and P2 that is closest to A

**Calculus**

There is a typo 8-x if 2?x?3

**Calculus**

There is a typo 8-x if 2?x?3

**Calculus**

Piecewise function x if ?2?x?0; x^2 if ?2<x<0; 8-x. If if ?2?x?3; (d) Write down an analytic formula for f^{-1}, and state its domain and range.

**Calculus **

Find inverse equation of y= 3e^(x-1)^5 Answer I got is (ln(x/3))^(1/5) +5 =y But I think it's wrong because the domain and range is really different from the original equation

**Linear algebra **

In R2 plot and describe the set of all points P whose position vector is of the form p = s(1, 1) + t(?1, 1), 0 ? s, t ? 1

**Algebra**

In R4 you are given the points P(2,2,2,2), Q(9,?5,1,3), R(6,8,?4,1) (a) Write out all possible arrows which can be formed using the points P,Q,R.

**Calculus**

Can someone help find limit using l'hopital rule lim x ? ? ((3x-4)/(3x+2))^(3x+1), I'm trying to solve by adding ln function to both side.

**Math**

can someone help me solve for x for this equation (0.5)(((cos(180-x))^(2))(cos(90-x))^(2))=0.0500

**Math**

can someone help me solve for x for this equation (0.5)(((cos(180-x))^(2))(cos(90-x))^(2))=0.0500

**Physics**

Light of wavelength 469 nm passes through a slit, creating a diffraction pattern on a screen. The angular separation between the first diffraction minima on either side of the central maximum is 6.0? . Determine the width of the slit. I used this equation to solve for the ...

**Physics**

(a) Would the pattern change if you were to use a shorter wavelength of light? Clearly state what change(s) would occur (if any) and briefly explain why. (b) The apparatus is surrounded by air. Would the pattern change if it were immersed in water instead? Clearly state what ...

**Physics**

Two glass microscope slides, of length 10 cm, are in contact at one end and separated by a sheet of paper at the other end, which creates a wedge-shaped film of air. The thickness of the paper is t = 59 ?m, and the glass has index of refraction n = 1.5. Light with wavelength 0...

**Calculus**

Find the limit. Use l'Hospital's Rule if appropriate. If there is a more elementary method, consider using it. lim (tan(7x))^x x~>0

**Chemistry**

A 24 L welding tank contains of 285 bar of argon at 28 °C. Nitrogen is added to obtain an 80:20 argon:nitrogen mixture. a) What are the partial pressures of argon and nitrogen? b) What will be the total tank pressure?

**Physics**

A beam of partially polarized light can be considered to be a mixture of polarized and unpolarized light. Suppose a beam of partially polarized light is sent through a polarizing filter. The polarization direction of the filter can be changed by rotating it. As the filter is ...

**Chemistry**

Explain the difference in acidity of MgO dissolved in water and of P4O10 in water in terms of position of the element in the periodic table and bonding. I found MgO is basic and P4O10 is acidic

**Chemistry**

Explain the difference in acidity of MgO dissolved in water and of P4O10 in water in terms of position of the element in the periodic table and bonding. I found MgO is basic and P4O10 is acidic

**Calculus**

A rectangular swimming pool is 8 m wide and 20 m long. Its bottom is a sloping plane, the depth increasing from 1 m at the shallow end to 3 m at the deep end. Water is draining out of the pool at a rate of 1 m3/min. How fast is the surface of the water falling when the depth ...

**Calculus**

show that ((x ? 1)/x) <( ln x) < (x ? 1) for all x>1 Hint: try to apply the Mean Value Theorem to the functions f(x) = lnx and g(x) = xlnx. I'm having trouble applying the mean value theorem

**calculus**

Could somebody help my find the critical points for y=(x-3)(x+2)^(2/3). When I take the derivative of the function I get is x=-2,3. But when I put the original function in wolfram alpha there is minimum at x=0

**Physics**

A student has a small battery-powered alarm buzzer. The student throws the buzzer toward a stationary wall (possibly due to frustration following a physics midterm examination). The buzzer emits sound with a frequency of 74 Hz, and the wall reflects the sound. If the buzzer is...

**math**

Fresh raspberries contain 80% water. Dried raspberries contain only 20% water. How many pounds of dried raspberries do you get from 36 lb of fresh berries?

**math**

iawdhoadhaoidhiawodwa

**Chemistry**

0.120

**world history**

I don't know. I don't even know why im on this website. Oh yeah, I NEEDED THE ANSWER!!!!!!

**Physics**

How would you derive the formula {-Ff+Fgx=ma} to show that µs=tanè

**physics**

A skier is going down a hill with a coefficient of friction of 0.21 and an angle of 7.5 degrees. if the skier has an initial velocity of 30 m/s, how fast will she be going after 10 s

**physics**

A Fletcher's trolley is set up over a cliff. If m1 = 40.5 kg (on top of the cliff) and m2 = 18.5 kg (hanging over the edge), what coefficient of friction is needed for the system not to move?

**Chemistry**

55

**Chemistry**

18

**physics**

5641

**Science**

I think its 1 km = 1,000 meters

**Po**

po po po po po po po po po po po

**Algebra**

#2 elimination 3x-7y=6 +2x+7y=4 ________ 5x =10 x =2 if x is 2, you plug it in 2(2)+7y=4 7y=4-4 y=0 (2,0)

**Math**

for the second one you take the log of both sides -x+3log9=log95 then you do algebra -x=(log95/log9) -3

**math**

plug 400 into x 350(400) - 70