Friday
May 24, 2013

# Posts by Vicky

Total # Posts: 188

science
i need a arostic poem on w e g e n e r and h e s s

organic chemistry
calculate the amount of isopentyl acetate that should be present in the reaction mixture at equilibrium, based on the quantities of starting materials you used and a value of 4.2 for the equilibrium costant

physics
A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 120 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: v_0 for the package equals the speed of the helicopter.]

chemistry
A sample of a breathing mixture for divers comtained 34.3% helium, 51.7% nitrogen, and 14% oxygen, by mass. What is the density of this mixture at 22degree celcius and 755mmHG?

MATH 15 Stats
simple random sample of 50 women on new product of the 50 women, 60% reported they like the new product, fina a 90% confidence interval for the true proportion of women.

math
Find the length of the hypotenuse of a right triangle, the other two sides of which measure 9 cm and 12 cm.

lim ((x^2-64)/(x+8)) x->-8

statistics
find the number z such that the proportion of observations are less than z in a standard normal distribution is 0.8

Math fractions
How do you get the answer for addition with unlike denominators: 3/8 + 1/2=

chemistry
so all the units i have to change is just for temperature and then leave the rest as they are

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