Tuesday

July 22, 2014

July 22, 2014

Total # Posts: 14

**statistics**

A teacher wants to compare the mean geology scores of two different classes. She is testing the null hypothesis that there is no difference in the population mean scores of the two classes. The difference of the sample means is 51.4. If the standard deviation of the distributi...

**Chemistry**

This solution is not right. I tried it several times and got the wrong answer I don't need the percent of c2h2, i want the final mass.

**Chemistry**

A mixture of C3H8 and C2H2 has a mass of 2.6g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. Find the mass of C2H2 in the original mixture.

**Chemistry**

A mixture of C3H8 and C2H2 has a mass of 2.6g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. Find the mass of C2H2 in the original mixture.

**Pre-calc**

Congruent squares are cut from the corners of a 20 in. square piece of tine, and the edges are turned up to make an open box. How large should the squares cut from the corners be in order to maximize the volume of the box?

**pre-calc**

a ship leaves port and sails for 2 hours north east and than 3 hours north west. If the speed remains constant, what course should the ship take home?

**Tipping over cows**

y = kx 9 = k*24 k = 3/8 y = 3/8 x 25 = 3/8 x x = 200/3

**Tipping over cows**

y = kx 9 = k*24 k = 3/8 y = 3/8 x 25 = 3/8 x x = 200/3

**PPPPPhysicssssss**

Two lasers are shining on a double slit, with slit separation d. Laser 1 has a wavelength of d/20, whereas laser 2 has a wavelength of d/15. The lasers produce separate interference patterns on a screen a distance 4.90m away from the slits. 1. What is the distance Δy_max-...

**Math**

Creepy :/

**Math**

I have absoloutley no idea but I am gonna go with what the said :)

**Science**

Dust is often light in color, while soot from fires is generally dark. What would happen to the amounts of solar radiation reflected and absorbed if a large amount of light-colored dust was added to the air? What if a large amount of dark soot was added?

**Math**

h² + 20=9h

**physics**

A ferry boat is 4.0 m wide and 6.0 m long. When a truck pulls onto it, the boat sinks 4.00 cm in the water. What is the combined weight of the truck and the ferry?

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