Saturday
May 18, 2013

# Posts by Jim

Total # Posts: 1305

Math
A random sample of 42 college graduates revealed that they worked an average of 5.5 years on the job before being promoted. The sample standard deviation was 1.1 years. Using the .99 degree of confidence, what is the confidence interval for the population mean?

Chemistry
What would be the effect of each of the following on the calculated molecular weight of the solute? a) some cyclohexane evaporated while the freezing point of pure cyclohexane was being measured. ( i think it would be higher) b)Some cyclohexane evaporated after the solute was ...

Math
((4sin(atan(4/3))-4sin(0)))-(-3cos(atan(4/3))-(-3cos(0)))+((-3cos(pi/2)-(-3cos(atan(4/3))))-(4sin(pi/2)-4sin(atan(4/3))))+((-3cos(4pi/5)-(-3cos(pi/2)))-(4sin(4pi/5)-4sin(pi/2)))

Math
A \$20,000 deposit was placed in a bank paying 5.75% interest compounded quarterly. After 12 months, how much interest was earned.

chem
Thank you DrBob

chem
Which compound has a higher boiling point and why? a. PF3 b. PF5

physics
You kick a .3kg soccer ball at a 30deg. angle. your toe provides an average force of 50N for .5m. How far does the ball go?

Math
Could someone pls. help me out on the following question: find the producers surplus (to the nearest dollar ) at a price level of p=\$26 for the price-supply equation p = s(x)= 5ln(x+1) . An early response would be greatly appreciated pls. Thank you.

Physics
A point charge +6.7 uC is placed at the origin, and a second charge –3.6 uC is placed in the X - Y plane at (0.40 m , 0.55 m ). Where should a third charge be placed in the plane so that the net force acting on it is zero?

math
i have 12 tens in me and my digits add to 12. who am i?

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